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help me how to subnet class A, B & C

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17 years 3 months ago #20834 by durk21

Hiya,

while doing VLSM, no need to worry about the IP Class range. The class type is only belongs to the IP range which you are using...as you mentioned on earlier post and its not depends to subnetmask..... Wink


The subnet mask is puerly used to define the number hosts, subet(networks), Network and Broadcast address for each subnets...for the given IP (what ever the class the IP belongs to)....


thank you thats what I was saying
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17 years 3 months ago #20837 by durk21
Class B Subnets
255.255.128.0 / 17
255.255.192.0 / 18
255.255.224.0 / 19
255.255.240.0 / 20
255.255.248.0 / 21
255.255.252.0 / 22
255.255.254.0 / 23
255.255.255.0 / 24

Power of 0's
2^15 - 2
2^14 - 2
2^13 - 2
2^12 - 2
2^11 - 2
2^10 - 2
2^9 - 2
2^8 - 2

Power of 1's
2^1 - 2
2^2 - 2
2^3 - 2
2^4 - 2
2^5 - 2
2^6 - 2
2^7 - 2
2^8 - 2

Number of Hosts
32768
16382
8190
4094
2046
1022
510
254

Number of Subnets
0
2
6
14
30
62
126
254

IP Address
128 - 191
128.0.0.0 - 191.255.255.255
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17 years 3 months ago #20839 by Smurf
Replied by Smurf on topic Re: hmmm?

255.128.0.0 is actually the first subnet though for a class A


for class B 128.0.0.0 to 191.255.255.255

255.255.128.0 is the first subnet

for class C 192.0.0.0 to 223.255.255.255

255.255.255.128 being the first subnet there
[/quote]

Unless i am missing something the point, I have no idea where you are getting this from, unless you can show the resource you are getting this from then we are going around in circles. Basically everything i have read states;

Class A - Subnet = 255.0.0.0
Class B - Subnet = 255.255.0.0
Class C - Subnet = 255.255.255.0

I'm not talking about TCP/IP I'm just talking about subnets and subnetting calculations


Er, no, TCP/IP is a book which explains everything to do with TCP/IP, since we are talking about IP addressing, it covers subnetting......

Wayne Murphy
Firewall.cx Team Member
www.firewall.cx

Now working for a Security Company called Sec-1 Ltd in the UK, for any
Penetration Testing work visit www.sec-1.com or PM me for details.
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17 years 3 months ago #20840 by durk21
Class C Subnets
255.255.255.128 / 25
255.255.255.192 / 26
255.255.255.224 / 27
255.255.255.240 / 28
255.255.255.248 / 29
255.255.255.252 / 30

Power of 0's
2^7 - 2
2^6 - 2
2^5 - 2
2^4 - 2
2^3 - 2
2^2 - 2

Power of 1's
2 ^1 - 2
2^2 - 2
2^3 - 2
2^4 - 2
2^5 - 2
2^6 - 2

Number of Hosts
126
62
30
14
6
2

Number of Subnets
0
2
6
14
30
62

IP Address
192 - 223
191.0.0.0 - 223.255.255.255

THIS IS MY CHART AS I HAVE IT TAKEN FROM NOTES A TEACHER GAVE


BUT as previously stated CLASS DOESN'T MATTER due to VLSM This is my chart made by a teacher and I'm sharing it with you. I've listed all three A,B,and C on the previous pages.
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17 years 3 months ago #20842 by durk21

Class A - Subnet = 255.0.0.0
Class B - Subnet = 255.255.0.0
Class C - Subnet = 255.255.255.0


this is an unfinished though and the Part of the IP address need to be applied I.E 128, 192, 224, and so on. So that is where I get

I dunno now you've got me confused Look at my charts
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17 years 3 months ago #20843 by durk21

Er, no, TCP/IP is a book which explains everything to do with TCP/IP, since we are talking about IP addressing, it covers subnetting......
_________________


didn't know that never dealt with it. I have only dealt with the www.ciscopress.com books i.e CCNA 1 and 2 so on on and study books
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