| IP ADDRESSING GUIDE | |||||||
| Class A | 1-127* | *loop back | Leading bits | 0 | |||
| Class B | 128-191 | 10 | |||||
| Class C | 192-223 | 110 | |||||
| Class D | 224-239 | Multicast | 1110 | ||||
| Class E | 240-255 | Xperimental | 11110 | ||||
| Formula to determine number of subnets or hosts created by borrowing bits from the host portion of the address | |||||||
| M= number of bits borrowed (Masked) | U= the number of bits remaining or not borrowed (unmasked) | ||||||
| 2^M= Total number of subnets created | 2^U= Total number of hosts on each subnet | ||||||
| 2^M - 2 =Usable number of subnets created | 2^U - 2= Usable number of hosts on each subnet | ||||||
| Class A License N.H.H.H | |||||||
| # of bits | Subnet mask | total subnets | usable subnets | Total Hosts | Usable Hosts | ||
| 2 | 255.192.0.0 | 4 | 2 | 4,194,304 | 4,194,302 | ||
| 3 | 255.224.0.0 | 8 | 6 | 2,097,152 | 2,097,150 | ||
| 4 | 255.240.0.0 | 16 | 14 | 1,048,576 | 1,048,574 | ||
| 5 | 255.248.0.0 | 32 | 30 | 524,288 | 524,286 | ||
| 6 | 255.252.0.0 | 64 | 62 | 262,144 | 262,142 | ||
| 7 | 255.254.0.0 | 128 | 126 | 131,072 | 131,070 | ||
| 8 | 255.255.0.0 | 256 | 254 | 65,536 | 65,534 | ||
| 9 | 255.255.128.0 | 512 | 510 | 32,768 | 32,766 | ||
| 10 | 255.255.192.0 | 1,024 | 1,022 | 16,384 | 16,382 | ||
| 11 | 255.255.224.0 | 2,048 | 2,046 | 8,192 | 8,190 | ||
| 12 | 255.255.240.0 | 4,096 | 4,094 | 4,096 | 4,094 | ||
| 13 | 255.255.248.0 | 8,192 | 8,190 | 2,048 | 2,046 | ||
| 14 | 255.255.252.0 | 16,384 | 16,382 | 1,024 | 1,022 | ||
| 15 | 255.255.254.0 | 32,768 | 32,766 | 512 | 510 | ||
| 16 | 255.255.255.0 | 65,536 | 65,534 | 256 | 254 | ||
| 17 | 255.255.255.128 | 131,072 | 131,070 | 128 | 126 | ||
| 18 | 255.255.255.192 | 262,144 | 262,142 | 64 | 62 | ||
| 19 | 255.255.255.224 | 524,288 | 524,286 | 32 | 30 | ||
| 20 | 255.255.255.240 | 1,048,576 | 1,048,574 | 16 | 14 | ||
| 21 | 255.255.255.248 | 2,097,152 | 2,097,150 | 8 | 6 | ||
| 22 | 255.255.255.252 | 4,194,304 | 4,194,302 | 4 | 2 | ||
| Class B Liscense N.N.H.H | |||||||
| # of bits | Subnet mask | total subnets | usable subnets | Total Hosts | Usable Hosts | ||
| 2 | 255.255.192.0 | 4 | 2 | 16,384 | 16,382 | ||
| 3 | 255.255.224.0 | 8 | 6 | 8,192 | 8,190 | ||
| 4 | 255.255.240.0 | 16 | 14 | 4,096 | 4,094 | ||
| 5 | 255.255.248.0 | 32 | 30 | 2,048 | 2,046 | ||
| 6 | 255.255.252.0 | 64 | 62 | 1,024 | 1,022 | ||
| 7 | 255.255.254.0 | 128 | 126 | 512 | 510 | ||
| 8 | 255.255.255.0 | 256 | 254 | 256 | 254 | ||
| 9 | 255.255.255.128 | 512 | 510 | 128 | 126 | ||
| 10 | 255.255.255.192 | 1,024 | 1,022 | 64 | 62 | ||
| 11 | 255.255.255.224 | 2,048 | 2,046 | 32 | 30 | ||
| 12 | 255.255.255.240 | 4,096 | 4,094 | 16 | 14 | ||
| 13 | 255.255.255.248 | 8,192 | 8,190 | 8 | 6 | ||
| 14 | 255.255.255.252 | 16,384 | 16,382 | 4 | 2 | ||
| Class C License N.N.N.H | |||||||
| # of bits | Subnet mask | total subnets | usable subnets | Total Hosts | Usable Hosts | ||
| 2 | 255.255.255.192 | 4 | 2 | 64 | 62 | ||
| 3 | 255.255.255.224 | 8 | 6 | 32 | 30 | ||
| 4 | 255.255.255.240 | 16 | 14 | 16 | 14 | ||
| 5 | 255.255.255.248 | 32 | 30 | 8 | 6 | ||
| 6 | 255.255.255.252 | 64 | 62 | 4 | 2 | ||