Just add little bit note.. Rather than memorizing 128 64 32 16 8 4 2 1 and so on so forth... just follow this link for above. Start with 128 (128+64 = 192) (192+32 = 224) (224+16=240) (240+8=248) (248+4=252) (252+2=254) (254+1=255) Overall, wonderful explanation for sub netting...
You can take the 128 and then add the next number under it, then keep adding... so 128 + 64 to get 192. Then add 32 to get 224, etc. So go right to left on the bottom multiplying by 2, then left to right on the top by adding the next number.
thank u so very much this concept had been on my nerves and now watching ur video just before finals is something i can't explain....this is so perfect
This video is an oversimplification of what is actually happening, but it is a helpful video nonetheless. Subnet-Mask ignores all the IPs below it but leaves all the high numbers(octaves) of what's left for the subnet. After you get the SubNetMask: 255.255.128.0 Just look at the last two Octaves(Numbers): 128.0 The first 2 octaves don't matter because they've already maxed out, and in the 3rd octave, anything below 128 doesn't matter to the subnet. Two of those left over IPs must be assigned to identify the subnet itself for delivering data and broadcasting data within the subnet. These are; 1) Network IP: 153.34.128.0 (That's the lowest unmasked value, it starts where the SubNetMask masked it) 2) Broadcast IP: 153.34.255.255 (Note the last two Octaves have gone max value, that's because the SubNetMask isn't stopping it) The FirstHost and LastHost are just in between those numbers.
Jordan,same deal with me. Lol : Jordan K 1 year ago this really helped me, and your explanation is so easy it made me laugh after being so confused from sitting in lectures
This is the first video I've seen that differentiates between the public and private subsets of classes. That finally made a lot of stuff click for me! Thanks!
There is one thing I have a tiny problem with understanding. 11:35 here you talk about subtracting 2 from 136, why 2? Do we always subtract 2 from the final? Is it because 135 is the broadcast IP and thus we always subtract 2 to get the last available one?
After spending a day trying to figure this out yours was the only explanation that's made any sense. Thanks man. BTW you sound like Jamie from Deus Ex.
Thanks for this video. I'm in the process of studying for my CCNA and the subnet mask part was getting confusing for me but this video was a light bulb going on for me.
Good Video!!! Still a little fuzzy about the the subnet mask. If it is a class A IP - will the subnet mask be in the 3rd octect? Or are the last two octects the only ones that can be manipulated?
hes expecting you to have a general concept of what your doing he explained that hes not going into depth he was just doing a video to help others but he wasn't going to go into depth so for what it was it was perfect for me, helped me pass my test with the way he explained it so its all about how much you actually know already, if you don't have an understanding in binary and networking your not going to understand anything hes talking about really, hes just helping people who already understand it but are still having trouble with it so hes offering a different solution and i like this solution it helped me a lot.
I agree. Actually, his explanation is somewhat clearer for me than other more detailed, drawn out longer videos. Straight-forward and no fluff works well for me.
Thanks for taking the time to make the video. I have one criticism though, reading every part verbatim takes up a lot of time and removing this would make future videos more to the point.
CIDR gives you the number of bits that are 1's starting from the left. Finding the subnet mask from a CIDR is as simple as putting each 8 bit binary string into decimal.
Maybe it wasnt totally clear, but he kinda explained in the beginning. IS that 2 of the addresses are reserved. One for network address and one for the broadcast address, These are the 2 that you subtract. So lets say you have a network with 64 hosts, but there are only 62 usable host because the network and broadcast address are reserved.
There are some "truths" you learn along the way when learning this stuff. A few of them are: - The NetID + 1 = The 1st Usable Host IP - The NetID + the Increment = The *Next NetID* - The *Next NetID* - 1 = The (previous NetID's) Broadcast IP - The *Next NetID* - 2 = The (previous NetID's) Last Usable Host IP
but in basic book author wendell odom edition 127 also present in class A address and 127 is actually a loop back address purpose...... this 127 basically addressed in class A instead class B
Great Job man. I just have 2 questions. The top row in green? Are those the IP class ranges? And how do the bottom numbers correspond to the top one in green? Other than that, I got everything down.
Sem Sinatra Easy! 2^8 = 256, correct, and The pink/orange colors are 2^0=1, 2^1=2, 2^2=4, 2^3=8, 2^4=16, 2^5=32, 2^6=64, 2^7=128 correct. the green numbers are just the value of 256 - (Pink/Orange number) Its all in the binary numbers 128 = 10000000b 64 = 01000000b 32 = 00100000b 16 = 00010000b 8 = 00001000b 4 = 00000100b 2 = 00000010b 1 = 00000001b The binary 1 number basically says where the separation line is. everything to the left stays the same everything else to the right changes by eights.
I'm not sure if this was explained in the video but I just discovered that you don't have to memorize the chart. Just take 2 and keep doubling it to 128 for the top part of the chart you just take 256 and subtracted the bottom number's thus giving you the top numbers.
Great video! The only thing I'm not getting is... Why did you subtract by 2 to get the last IP in the first example, but subtracted by 1 for the second one?
In example 2 there is no mention of the 4th octet, 242, and instead you work with the 3rd octet, 173. Is this to do with the subnet working out in the 3rd octet? As opposed to the first example where everything was done in the 4th octet.
I liked it, you did explain it very well, but on second example i lost u. anyway, i have subnet mask in my router - 255.255.255.255, what dose it mean and why i need it?
+1776FreedomNow Its because the second example reaches the max bit value at 255. If he were to pretend that the next subnet is 256 for example then 256 - 2 still kinda works to find the last possible hosts for the previous subnet. Remember that in the first example he found the last IP from subtracting "2" from the next possible subnet available therefore 136-2 = 134 136 is the next subnet ID on the 17th subnet 135 woud be the broadcast address 134 would be the last possible IP for the 16th subnet So following this logic on the next example it would look like this: 255 is the broadcast address 254 is the last possible IP So again because 255 is a full octet he can technically look at it like this 256-2 = last possible IP.
it was easy explanation but i got little confused when you start to do the firs host on the next example. i have to watch over and over hopfully i'll get it . much much better than my stupid cisco teacher
+jetawe gameTV Go watch the Asher Dallas Lecture Subnetting series .. I have watched it over the course of a few days and it has helped me get a really good understanding on how to subnet. it says there are 6 parts but there is only 3 parts available.
Since the "increment" was 8 -- he was trying to figure out/guess which "set of 8 IPs" the starting IP was in. Turns out the IP was in the 16th set of 8 -- which started with 128. (17 x 8 was too high; 16 x 8 was just right.)
Because it represents bit of computer 0 or 1 (2 values). The exponent tells how many bits are in the number. So three bit number example: 111 = 7 so 3 bit number can represent up to 8 decimal values. 0, 1, 2, 3, 4, 5, 6, 7.
@@didaspaxi2885 Yes. The equation is 2 to the (n)th power where (n) the CIDR notation /17 subtracted from the octet above it (in this case the third octet since it is less than 24 which equals 7 [24=17]. So you raise 2 to the 7th power which equals 128. Using the chart you will see that the subnets are every 128 IPs and subnet mask is 255.255.128 (from chart 128).0 . Hope that clears it up a bit for you =)
i was confused with the example sir... how come the third octet 173 was changed to 128 for the network ip, first host ip, last host ip and broadcast ip?
Hi! I was wondering what happens if the subnet number is either 8, 16, 24, or 32. Would you subtract it from its own number or does it have to be subtracted from a number that is larger than it?
I appreciate your creativity , I followed your way but it fails somewhere because it doesn't have specific formula. for instance Ip 184.136.0.0 /16 , 32-16 or 24-16 which is correct ? i am confused
the way I have worked out the subnet mask in the past is by looking at the CIDR and whatever the CIDR was e.g. /24 I would place 24 1s for the subnet mask and work it out that way. Im not sure that im making any sense lol, BUT THIS METHOD IS MUCH EASIER AND QUICKER.
Just add little bit note..
Rather than memorizing 128 64 32 16 8 4 2 1 and so on so forth... just follow this link for above.
Start with 128 (128+64 = 192) (192+32 = 224) (224+16=240) (240+8=248) (248+4=252) (252+2=254) (254+1=255)
Overall, wonderful explanation for sub netting...
+Nijer Manus exellent tip
I have a question Khan. Why it in 128, not in 136 network. I am referring to 11:11. Thanks.
thank you
not all heroes wear capes
yes this is good also.
For those wondering, the top row, is just 256 minus the bottom row... You dont have to memorize it..
my same thoughts
Moe Zuiter
THANK YOU!!!
You can take the 128 and then add the next number under it, then keep adding... so 128 + 64 to get 192. Then add 32 to get 224, etc. So go right to left on the bottom multiplying by 2, then left to right on the top by adding the next number.
awesome one
thank you :)
After watching many videos, I finally found this one that makes sense.
Can you please share some more examples of submitting practices, also without sider notation and IPv6 as well thanks
thank u so very much this concept had been on my nerves and now watching ur video just before finals is something i can't explain....this is so perfect
Your second example just completely threw me off
SBrawlers same here
the second example threw me on
SBrawlers can someone please explain how on the second example the third octet how did he get 255 I'm so lost
This video is an oversimplification of what is actually happening, but it is a helpful video nonetheless.
Subnet-Mask ignores all the IPs below it but leaves all the high numbers(octaves) of what's left for the subnet.
After you get the SubNetMask: 255.255.128.0
Just look at the last two Octaves(Numbers): 128.0
The first 2 octaves don't matter because they've already maxed out, and in the 3rd octave, anything below 128 doesn't matter to the subnet.
Two of those left over IPs must be assigned to identify the subnet itself for delivering data and broadcasting data within the subnet. These are;
1) Network IP: 153.34.128.0 (That's the lowest unmasked value, it starts where the SubNetMask masked it)
2) Broadcast IP: 153.34.255.255 (Note the last two Octaves have gone max value, that's because the SubNetMask isn't stopping it)
The FirstHost and LastHost are just in between those numbers.
yea the second example got me right
Even after 4 years that u post this video, I say thank u
this really helped me, and your explanation is so easy it made me laugh after being so confused from sitting in lectures
Jordan,same deal with me. Lol :
Jordan K
1 year ago
this really helped me, and your explanation is so easy it made me laugh after being so confused from sitting in lectures
Thank you so much for this! Of all the videos this helped the most. I've found this one of the most confusing subjects in networking.
Thanks again.
Watch "Subnetting is simple" by sunny classroom
This is the first video I've seen that differentiates between the public and private subsets of classes. That finally made a lot of stuff click for me! Thanks!
After all searched a lot of video regarding subnet masking got the right one,Thanks this video help me a lot.
i just wanna say that out of all the videos that I have seen this the only
one that is making m grasp subnetting great work man!!!!!!!
Great explanation, clear, slow and very precise ! I JUST LEARN SUBNETTING !!!! :))
Explained like a BOSS. No more doubts. Commendable work....
Very well explained Mr. Khan...Grt video...Thank you.
Thanks a lot I understand this better because my professor wasn't explaining this in a way that I was understanding.
There is one thing I have a tiny problem with understanding. 11:35 here you talk about subtracting 2 from 136, why 2? Do we always subtract 2 from the final? Is it because 135 is the broadcast IP and thus we always subtract 2 to get the last available one?
You've just unlocked my many years problem within 16 min thank you so much
After spending a day trying to figure this out yours was the only explanation that's made any sense. Thanks man. BTW you sound like Jamie from Deus Ex.
Excellent teaching
Thank you very much.I just starting cisco ccna and you helped me understand the concept of subnetting. 👏
I tried this method on a past exam paper , and it worked, thank you !
thank you so much sir.your video helped me alot b4 my practical exam. :-)
Thanks for this video. I'm in the process of studying for my CCNA and the subnet mask part was getting confusing for me but this video was a light bulb going on for me.
Tanx alot man 👍🏼 urs was the first video I watched that went straight to the point with clear instructions
Clear and straight to the point. Thank u
Are you using a mouse or a stapler?
Hole punch?
Good Video!!! Still a little fuzzy about the the subnet mask. If it is a class A IP - will the subnet mask be in the 3rd octect? Or are the last two octects the only ones that can be manipulated?
Easy, simple,Nice method to teach
Yeah this was pretty terrible. No real explanation of a lot of the concepts. 'Just remember these numbers' is not useful.
Craig Wallace totally agree, it was horrible. He needs to tie everything back to real concepts. This not a math class
hes expecting you to have a general concept of what your doing he explained that hes not going into depth he was just doing a video to help others but he wasn't going to go into depth so for what it was it was perfect for me, helped me pass my test with the way he explained it so its all about how much you actually know already, if you don't have an understanding in binary and networking your not going to understand anything hes talking about really, hes just helping people who already understand it but are still having trouble with it so hes offering a different solution and i like this solution it helped me a lot.
I agree. Actually, his explanation is somewhat clearer for me than other more detailed, drawn out longer videos. Straight-forward and no fluff works well for me.
most course give the same cheatsheet and do not explain about the how and the why.
Thanks for this best & clear enlightenment
I've been struggling with IP addressing all term. I finally get it. This is a clear, straightforward , and thorough explanation. Thank you!
Thanks for taking the time to make the video. I have one criticism though, reading every part verbatim takes up a lot of time and removing this would make future videos more to the point.
Thank you for this tutorial it helped clear things up
Thank you, this helped a lot!
CIDR gives you the number of bits that are 1's starting from the left. Finding the subnet mask from a CIDR is as simple as putting each 8 bit binary string into decimal.
Thanks man! good explaining. well done. thanks
You didn't explain last host address in detail. All you said was "subtract that by 2".
Maybe it wasnt totally clear, but he kinda explained in the beginning. IS that 2 of the addresses are reserved. One for network address and one for the broadcast address, These are the 2 that you subtract. So lets say you have a network with 64 hosts, but there are only 62 usable host because the network and broadcast address are reserved.
There are some "truths" you learn along the way when learning this stuff. A few of them are:
- The NetID + 1 = The 1st Usable Host IP
- The NetID + the Increment = The *Next NetID*
- The *Next NetID* - 1 = The (previous NetID's) Broadcast IP
- The *Next NetID* - 2 = The (previous NetID's) Last Usable Host IP
Can you explain the proportion how many networks with how many hosts?
2:13
Hold on, the class A range ends at 126. IP address 127 isn't used for public IP addresses because it's a reserved address.
but in basic book author wendell odom edition 127 also present in class A address and 127 is actually a loop back address purpose...... this 127 basically addressed in class A instead class B
very easy method.....nice work
Very informative. IP address and Subnetting simplified :)
Amazing video and you made it simple with excel...
you just safe my life in understanding this. thank you very much. May God bless you always.
7:38 Where do you get 2^3 from?
THANKYOU WHERE HE GET THE 2 FROM
great tut man! just want i needed for my exam
vary good way to calculate the subnet thanks so mach
Amazing explanation.
Great Job man. I just have 2 questions. The top row in green? Are those the IP class ranges? And how do the bottom numbers correspond to the top one in green?
Other than that, I got everything down.
Candor please see my video for understanding subnetting in 10 minutes
interesting tutorial, but what do the green numbers and the orange numbers really mean?
1) When the little man says green, Cross. 2) Red is missing and kids are going to get run over.
the green numbers and orange numbers? they don't mean nuffink ;-)
Sem Sinatra Still, they brighten the page up a bit. Nice wallpaper!
Sem Sinatra Easy! 2^8 = 256, correct, and The pink/orange colors are 2^0=1, 2^1=2, 2^2=4, 2^3=8, 2^4=16, 2^5=32, 2^6=64, 2^7=128 correct. the green numbers are just the value of 256 - (Pink/Orange number)
Its all in the binary numbers
128 = 10000000b
64 = 01000000b
32 = 00100000b
16 = 00010000b
8 = 00001000b
4 = 00000100b
2 = 00000010b
1 = 00000001b
The binary 1 number basically says where the separation line is. everything to the left stays the same everything else to the right changes by eights.
I'm not sure if this was explained in the video but I just discovered that you don't have to memorize the chart. Just take 2 and keep doubling it to 128 for the top part of the chart you just take 256 and subtracted the bottom number's thus giving you the top numbers.
2^3 is the same as saying double 2, 3 times
Great video! The only thing I'm not getting is... Why did you subtract by 2 to get the last IP in the first example, but subtracted by 1 for the second one?
7:40 where do you get that "2" ?
13:14 and here again?
Look at the tan row of numbers. It increases by the power of 2. It's the formula
Thanks!
This is a great explanation! Thank you!
Great video!! for a moment i thot RDJ was talkin ! :D
great explanation! Love it
Great video. thanks.
Best explanation ever seen in the internet , for subnetting . Good :-)
Excellent..!! @nijer and howitthink
In example 2 there is no mention of the 4th octet, 242, and instead you work with the 3rd octet, 173. Is this to do with the subnet working out in the 3rd octet? As opposed to the first example where everything was done in the 4th octet.
This helped me a lot, thanks! This was a good tutorial.
Great help on my report. Thanks a lot!!! ❤❤❤
Class A ip adresses are from 1-126and B from 128-191.127 is reserved.
I liked it, you did explain it very well, but on second example i lost u. anyway, i have subnet mask in my router - 255.255.255.255, what dose it mean and why i need it?
Do a follow up for IPv6 please !!!!
Great explanation.. Just need to practice it now. Thanks a lot!
that is really good training thank you
How did you solve the Last host IP? In the first example you subtracted by 2 in the second example you subtracted by 1.
+1776FreedomNow
Its because the second example reaches the max bit value at 255. If he were to pretend that the next subnet is 256 for example then 256 - 2 still kinda works to find the last possible hosts for the previous subnet.
Remember that in the first example he found the last IP from subtracting "2" from the next possible subnet available therefore 136-2 = 134
136 is the next subnet ID on the 17th subnet
135 woud be the broadcast address
134 would be the last possible IP for the 16th subnet
So following this logic on the next example it would look like this:
255 is the broadcast address
254 is the last possible IP
So again because 255 is a full octet he can technically look at it like this 256-2 = last possible IP.
simply gr8...nice and simple
Thanks a lot for the class.. :)
how did you get the 17 to subtract it from the 8? is there a way I can find it if I don't have excel? please respond soon
it was easy explanation but i got little confused when you start to do the firs host on the next example. i have to watch over and over hopfully i'll get it . much much better than my stupid cisco teacher
+jetawe gameTV Go watch the Asher Dallas Lecture Subnetting series .. I have watched it over the course of a few days and it has helped me get a really good understanding on how to subnet. it says there are 6 parts but there is only 3 parts available.
+Brenda Mejia i sure will thank you
Why have multiplied 17*8=136
136-8
my question is where you got 17 so that you can include in
i did'nt understand how to find last host ip in both the example..if u kindly explain it in another example then i am very much thankful to you.
Question. When getting the subnet mask, where does 255.255.255 come from?
Thanks man
great work
If you wanna learn subnet then watch:
‘Subnetting made simple’ by Carl Oliver.
Only 6min long and very simple. You’re welcome 😊
A lot easier. Ty
How to do /24 pls make one more video on it
This was great, thank you.
This truly helped...thanks!
Really helpful, thanks!
why multiply to 17? i dont understand here
Since the "increment" was 8 -- he was trying to figure out/guess which "set of 8 IPs" the starting IP was in. Turns out the IP was in the 16th set of 8 -- which started with 128. (17 x 8 was too high; 16 x 8 was just right.)
Isn't 127 used for loopback only?
one of the best vids ever on this subject
Hello. What is the total # of hosts on the second example? Is (128*256) - 2 = 32766 the correct answer? Thanks
7:41 Why do you Choose 2 and NOT any other number ?
Because it represents bit of computer 0 or 1 (2 values). The exponent tells how many bits are in the number. So three bit number example: 111 = 7 so 3 bit number can represent up to 8 decimal values. 0, 1, 2, 3, 4, 5, 6, 7.
7:48 why did you start from 2 and not 1, shouldnt the magic number be 8
very good video, thanks for uploaded in youtube this video thank you very much
In the second example why does it increase by 128 and not 7 ,as the previuos example
+mulinya nimrod you are right. why is it 128 and not 7?? please help
+Katherine May hey katherine,,because its already doubled by 128..whateva ur getting after powering with 2 ,,u need to use that number
in 2^3=8, where 2 came from, and why 2?
Because binary is base 2
I also confused
2x2x2=8
so it will always be 2?
@@didaspaxi2885 Yes. The equation is 2 to the (n)th power where (n) the CIDR notation /17 subtracted from the octet above it (in this case the third octet since it is less than 24 which equals 7 [24=17]. So you raise 2 to the 7th power which equals 128. Using the chart you will see that the subnets are every 128 IPs and subnet mask is 255.255.128 (from chart 128).0 . Hope that clears it up a bit for you =)
i was confused with the example sir... how come the third octet 173 was changed to 128 for the network ip, first host ip, last host ip and broadcast ip?
because its starts with 128 and the rest because its the range between 128 and 256
thanks you,really appreciate you help.
thanks man, i really appreciate your tutorial :)
Please explain CIDR?
Hi! I was wondering what happens if the subnet number is either 8, 16, 24, or 32. Would you subtract it from its own number or does it have to be subtracted from a number that is larger than it?
I appreciate your creativity , I followed your way but it fails somewhere because it doesn't have specific formula. for instance Ip
184.136.0.0 /16 , 32-16 or 24-16 which is correct ? i am confused
Thanks! Great review
why do we multiply by 17? At 11:03 second. And then why do we subtract 8 from (8*17)? What is the logic here?
Thank you ...u just brief it simply !1
the way I have worked out the subnet mask in the past is by looking at the CIDR and whatever the CIDR was e.g. /24 I would place 24 1s for the subnet mask and work it out that way. Im not sure that im making any sense lol, BUT THIS METHOD IS MUCH EASIER AND QUICKER.