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Class C Subnetting ??

By k4k ·
According to my understanding the Subnet Mask
of class C 255.255.255.224 can have 6 Subnets those are 32,64,96,128,160,192. & it can have 30 host per subnet. i.e 11100000 three bits for Subnet & rest of the 5 bits for Host.

but you see there is an IP Address 203.200.55.55 with Subnet mask 255.255.255.224. how is this ??
here the subnet 55 is the point of confusion. according to what i understand the subnet 55 is not one of those i mentioned above. the above calculation says the subnets u can have for this subnet mask 255.255.255.224 are 32,64,96,128,160,192 then where did this 55 came from ??


Could u throw some light on this ??

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Class C Subnetting ??

by isys In reply to Class C Subnetting ??

I think your calculation may have gone awry. For a net mask of 255.255.255.224 you have a total of eight subnets, not six, comprised of 30 hosts each: .1 through .30, .33 through .62, .65 through .94, .97 through .126, .129 through .158, .161 through .190, .193 through .222, and .225 through 254. Remember, each subnet reserves one address for the network and one for broadcast.

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Class C Subnetting ??

by k4k In reply to Class C Subnetting ??

No its only 6 subnets it can't be 8. coz 001 00000 (32) & 001 11111 (63) are reserved for Network & Broadcast respectively. 3 bits for subnet means 2to the power of 3 minus 2 thatz sums to 6 subnet

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Class C Subnetting ??

by curlergirl In reply to Class C Subnetting ??

I think you are confused about subnets v. IP addresses. The IP address 203.200.55.55 with a subnet mask of 255.255.255.224 would be part of the subnet of addresses beginning with 203.200.55.33 and ending with 203.200.55.62 (total of 30 possible IP addresses within this subnet), all with a subnet mask of 255.255.255.224. The subnets identify a RANGE of IP addresses, not a single address. Hope this helps!

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Class C Subnetting ??

by k4k In reply to Class C Subnetting ??

i was talking about the third octet which was my confusion. anyway thanks for the response.

i'll get back with more question .

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Class C Subnetting ??

by hook In reply to Class C Subnetting ??

http://www.learntosubnet.com/

This will really help you with subnetting.

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Class C Subnetting ??

by k4k In reply to Class C Subnetting ??

Poster rated this answer

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Class C Subnetting ??

by isys In reply to Class C Subnetting ??

If you use the logical approach, your computation is wrong because the number of subnets must be an even power of 2. Six is not.

This location covers calculation:

http://safepipe.eicon.com/courses/ip/#13

For a subnet calcualtor look here:
http://www.subnetonline.com/subnet/subnet.html

The netmask for 203.200.55.55 is 203.200.55.32.

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Class C Subnetting ??

by Meganetcomputers In reply to Class C Subnetting ??

You are correct there is a total of 6 usable subnets but 8 subnets total. You are not to use the first and the last subnets in this group. So you will have IP address available from:

Network ID 1: 203.200.55.1 - 203.200.55.33
Useable address would be:
203.200.55.2-203.200.55.32
Network ID 2: 203.200.55.33 - 203.200.55.62
Useable address would be:
203.200.55.34-203.200.55.61

and so on with the Network ID increased by the number of hosts. You IP address would be associated with Network ID 2. If you need any further assistance please e-mail me.

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Class C Subnetting ??

by k4k In reply to Class C Subnetting ??

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