Cheatography
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ADDRESS CLASS: A, B, CClass: | A | B | C | Range | 0-127 | 128-191 | 192-223 | N/H | N.H.H.H | N.N.H.H | N.N.N.H | Network Bits | Nx8 = 8 | Nx8 = 16 | Nx8 = 24 | Host Bits | Hx8 = 24 | Hx8 = 16 | Hx8 = 8 | # Addresses | 16,777,210 | 66,536 | 256 | Private Range | 10.0.0.0 - 10.255.255.255 | 172.16.0.0 - 172.31.255.255 | 192.168.0.0 - 192.168.255.255 | Subnet Mask | 255.0.0.0 | 255.255.0.0 | 255.255.255.0 |
ADDRESS CLASS: D & ECLASS | RANGE | NOTE | D | 224 - 239 | reserved for multicasting | E | 240 - 255 | reserved for research & development |
Power of 2 table2^0 | 1 | 2^8 | 256 | 2^1 | 2 | 2^9 | 512 | 2^2 | 4 | 2^10 | 1,024 | 2^3 | 8 | 2^11 | 2,048 | 2^4 | 16 | 2^12 | 4,096 | 2^5 | 32 | 2^13 | 8,192 | 2^6 | 64 | 2^14 | 16,384 | 2^7 | 128 | 2^15 | 32,768 |
BIT, VALUE, MASKBIT | VALUE | N-BITS / H-BITS | MASK | 1 | 128 | 1 / 7 | 10000000 | 2 | 192 | 2 / 6 | 11000000 | 3 | 224 | 3 / 6 | 11100000 | 4 | 240 | 4 / 4 | 11110000 | 5 | 248 | 5 / 3 | 11111000 | 6 | 252 | 6 / 2 | 11111100 | 7 | 254 | 7 / 1 | 11111110 | 8 | 255 | 8 / 0 | 11111111 |
SOME FORMULAS# BLOCKS FOR LARGE #s | 2^H / 256 = # BLOCKS | NUMBER OF SUBNETS = | 2^n ( n = Number of borrowed bits from host) | NUMBER HOSTS PER SUBNET = | (2^h - 2) ( h = Number of Host bits) |
Hosts have always been with the "-2" part. Because the network address and broadcast address have always been unusable for hosts.
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Thanks for building this cheat sheet for IP addressing. I have downloaded it to keep on hand.
Robert Bone- You are absolutely welcome! I created it to have handy for a GIAC exam. I'm glad it was useful for you as well.
Thank you Amanda for posting!
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