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IPv4-Subnet-Mask-Reference-Class-C.md

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IPv4-Subnet-Mask-Reference-Class-C.md

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IPv4 Subnet Mask Reference - Class C

Addresses Netmask %ClsC %ClsB %ClsA
/31 2 255.255.255.254 1/128
/30 4 255.255.255.252 1/64
/29 8 255.255.255.248 1/32
/28 16 255.255.255.240 1/16
/27 32 255.255.255.224 1/8
/26 64 255.255.255.192 1/4
/25 128 255.255.255.128 1/2 1/512
/24 256 255.255.255.0 1 1/256
/23 512 255.255.254.0 2 1/128
/22 1024 255.255.252.0 4 1/64
/21 2048 255.255.248.0 8 1/32
/20 4096 255.255.240.0 16 1/16
/19 8192 255.255.224.0 32 1/8
/18 16384 255.255.192.0 64 1/4
/17 32768 255.255.128.0 128 1/2 1/512
/16 65536 255.255.0.0 256 1 1/256
/15 131072 255.254.0.0 512 2 1/128
/14 262144 255.252.0.0 1024 4 1/64
/13 524288 255.248.0.0 2048 8 1/32
/12 1048576 255.240.0.0 4096 16 1/16
/11 2097152 255.224.0.0 8192 32 1/8
/10 4194304 255.192.0.0 16384 64 1/4
/9 8388608 255.128.0.0 32768 128 1/2
/8 16777216 255.0.0.0 65536 256 1

IP Address Classes

  • Class C: 192.168.0.0 - 192.168.255.255
    • 65,536 IP addresses
    • 2,097,152 networks with 254 usable hosts per network
    • default subnet mask 255.255.255.0
  • Class B: 172.16.0.0 - 172.31.255.255
    • 1,048,576 IP addresses
    • 16,384 networks with 65,534 usable hosts per network
    • default subnet mask 255.255.0.0
  • Class A: 10.0.0.0 - 10.255.255.255
    • 16,777,216 IP addresses
    • 128 networks with 16,777,214 usable hosts per network
    • default subnet mask 255.0.0.0
octets A B C D
Example 192 168 200 54
Desc A A A A A A A A B B B B B B B B C C C C C C C C D D D D D D D D
4X8bits 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
32 bits 32 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
binaddr 1 1 0 0 0 0 0 0 1 0 1 0 1 0 0 0 1 1 0 0 1 0 0 0 0 0 1 1 0 1 1 0
mask 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 0 0 0 0 0 0 0 0 0 1 0