All tools / Subnet cheat sheet
/8 subnet mask
A /8 block has 16,777,216 addresses with the netmask 255.0.0.0. The size of the private range 10.0.0.0/8.
255.0.0.0| CIDR notation | /8 |
| Netmask | 255.0.0.0 |
| Wildcard mask | 0.255.255.255 |
| Total addresses | 16,777,216 |
| Usable hosts | 16,777,214 |
| Usable in an AWS subnet | n/a (AWS allows /16 to /28) |
| Example range | 10.0.0.0/8: 10.0.0.0 to 10.255.255.255 |
How /8 fits with other sizes
- It splits into 2 subnets of /9.
- It splits into 4 subnets of /10.
- It splits into 16 subnets of /12.