RIRs (Regional Inernet Registries) - regionální (per kontinent) organizace mající na starosti přidělování adres.
Class | Leading bits | start IP | end IP | Mask | CIDR |
---|---|---|---|---|---|
A | 0 | 0.0.0.0 | 127.255.255.255 | 255.0.0.0 | /8 |
B | 10 | 128.0.0.0 | 191.255.255.255 | 255.255.0.0 | /16 |
C | 110 | 192.0.0.0 | 223.255.255.255 | 255.255.255.0 | /24 |
D | 1110 | 224.0.0.0 | 239.255.255.255 | - | - |
E | 11110 | 240.0.0.0 | 255.255.255.255 | - | - |
Definovány v RFC 1918
Class | Private block | Range |
---|---|---|
A | 10.0.0.0/8 | 10.0.0.0 - 10.255.255.255 |
B | 172.16.0.0/12 | 172.16.0.0 - 172.31.255.255 |
C | 192.168.0.0/16 | 192.168.0.0 - 192.168.255.255 |