| Address format |
Difference to last address |
Mask | Addresses | Relative to class A, B, C |
Restrictions on a, b, c and d (0..255 unless noted) |
Typical use | |
|---|---|---|---|---|---|---|---|
| Decimal | 2n | ||||||
| a.b.c.d / 32 | +0.0.0.0 | 255.255.255.255 | 1 | 20 | 1/ 256 C | Host route | |
| a.b.c.d / 31 | +0.0.0.1 | 255.255.255.254 | 2 | 21 | 1/ 128 C | d = 0 ... (2n) ... 254 | Point to point links (RFC 3021) |
| a.b.c.d / 30 | +0.0.0.3 | 255.255.255.252 | 4 | 22 | 1/ 64 C | d = 0 ... (4n) ... 252 | Point to point links (glue network) |
| a.b.c.d / 29 | +0.0.0.7 | 255.255.255.248 | 8 | 23 | 1/ 32 C | d = 0 ... (8n) ... 248 | Smallest multi-host network |
| a.b.c.d / 28 | +0.0.0.15 | 255.255.255.240 | 16 | 24 | 1/ 16 C | d = 0 ... (16n) ... 240 | Small LAN |
| a.b.c.d / 27 | +0.0.0.31 | 255.255.255.224 | 32 | 25 | ⅛ C | d = 0 ... (32n) ... 224 | |
| a.b.c.d / 26 | +0.0.0.63 | 255.255.255.192 | 64 | 26 | ¼ C | d = 0, 64, 128, 192 | |
| a.b.c.d / 25 | +0.0.0.127 | 255.255.255.128 | 128 | 27 | ½ C | d = 0, 128 | Large LAN |
| a.b.c.0 / 24 | +0.0.0.255 | 255.255.255.0 | 256 | 28 | 1 C | ||
| a.b.c.0 / 23 | +0.0.1.255 | 255.255.254.0 | 512 | 29 | 2 C | c = 0 ... (2n) ... 254 | |
| a.b.c.0 / 22 | +0.0.3.255 | 255.255.252.0 | 1,024 | 210 | 4 C | c = 0 ... (4n) ... 252 | |
| a.b.c.0 / 21 | +0.0.7.255 | 255.255.248.0 | 2,048 | 211 | 8 C | c = 0 ... (8n) ... 248 | Small ISP / large business |
| a.b.c.0 / 20 | +0.0.15.255 | 255.255.240.0 | 4,096 | 212 | 16 C | c = 0 ... (16n) ... 240 | |
| a.b.c.0 / 19 | +0.0.31.255 | 255.255.224.0 | 8,192 | 213 | 32 C | c = 0 ... (32n) ... 224 | ISP / large business |
| a.b.c.0 / 18 | +0.0.63.255 | 255.255.192.0 | 16,384 | 214 | 64 C | c = 0, 64, 128, 192 | |
| a.b.c.0 / 17 | +0.0.127.255 | 255.255.128.0 | 32,768 | 215 | 128 C | c = 0, 128 | |
| a.b.0.0 / 16 | +0.0.255.255 | 255.255.0.0 | 65,536 | 216 | 256 C = B | ||
| a.b.0.0 / 15 | +0.1.255.255 | 255.254.0.0 | 131,072 | 217 | 2 B | b = 0 ... (2n) ... 254 | |
| a.b.0.0 / 14 | +0.3.255.255 | 255.252.0.0 | 262,144 | 218 | 4 B | b = 0 ... (4n) ... 252 | |
| a.b.0.0 / 13 | +0.7.255.255 | 255.248.0.0 | 524,288 | 219 | 8 B | b = 0 ... (8n) ... 248 | |
| a.b.0.0 / 12 | +0.15.255.255 | 255.240.0.0 | 1,048,576 | 220 | 16 B | b = 0 ... (16n) ... 240 | |
| a.b.0.0 / 11 | +0.31.255.255 | 255.224.0.0 | 2,097,152 | 221 | 32 B | b = 0 ... (32n) ... 224 | |
| a.b.0.0 / 10 | +0.63.255.255 | 255.192.0.0 | 4,194,304 | 222 | 64 B | b = 0, 64, 128, 192 | |
| a.b.0.0 / 9 | +0.127.255.255 | 255.128.0.0 | 8,388,608 | 223 | 128 B | b = 0, 128 | |
| a.0.0.0 / 8 | +0.255.255.255 | 255.0.0.0 | 16,777,216 | 224 | 256 B = A | Largest IANA block allocation | |
| a.0.0.0 / 7 | +1.255.255.255 | 254.0.0.0 | 33,554,432 | 225 | 2 A | a = 0 ... (2n) ... 254 | |
| a.0.0.0 / 6 | +3.255.255.255 | 252.0.0.0 | 67,108,864 | 226 | 4 A | a = 0 ... (4n) ... 252 | |
| a.0.0.0 / 5 | +7.255.255.255 | 248.0.0.0 | 134,217,728 | 227 | 8 A | a = 0 ... (8n) ... 248 | |
| a.0.0.0 / 4 | +15.255.255.255 | 240.0.0.0 | 268,435,456 | 228 | 16 A | a = 0 ... (16n) ... 240 | |
| a.0.0.0 / 3 | +31.255.255.255 | 224.0.0.0 | 536,870,912 | 229 | 32 A | a = 0 ... (32n) ... 224 | |
| a.0.0.0 / 2 | +63.255.255.255 | 192.0.0.0 | 1,073,741,824 | 230 | 64 A | a = 0, 64, 128, 192 | |
| a.0.0.0 / 1 | +127.255.255.255 | 128.0.0.0 | 2,147,483,648 | 231 | 128 A | a = 0, 128 | |
| 0.0.0.0 / 0 | +255.255.255.255 | 0.0.0.0 | 4,294,967,296 | 232 | 256 A | ||
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