All tools / Subnet cheat sheet
/25 subnet mask
A /25 block has 128 addresses with the netmask 255.255.255.128.
255.255.255.128| CIDR notation | /25 |
| Netmask | 255.255.255.128 |
| Wildcard mask | 0.0.0.127 |
| Total addresses | 128 |
| Usable hosts | 126 |
| Usable in an AWS subnet | 123 |
| Example range | 10.0.0.0/25: 10.0.0.0 to 10.0.0.127 |
How /25 fits with other sizes
- A /8 holds 131,072 subnets of /25.
- A /16 holds 512 subnets of /25.
- A /20 holds 32 subnets of /25.
- A /24 holds 2 subnets of /25.
- It splits into 2 subnets of /26.
- It splits into 4 subnets of /27.
- It splits into 16 subnets of /29.