All tools / Subnet cheat sheet
/28 subnet mask
A /28 block has 16 addresses with the netmask 255.255.255.240. The smallest subnet AWS allows in a VPC.
255.255.255.240| CIDR notation | /28 |
| Netmask | 255.255.255.240 |
| Wildcard mask | 0.0.0.15 |
| Total addresses | 16 |
| Usable hosts | 14 |
| Usable in an AWS subnet | 11 |
| Example range | 10.0.0.0/28: 10.0.0.0 to 10.0.0.15 |
How /28 fits with other sizes
- A /8 holds 1,048,576 subnets of /28.
- A /16 holds 4,096 subnets of /28.
- A /20 holds 256 subnets of /28.
- A /24 holds 16 subnets of /28.
- It splits into 2 subnets of /29.
- It splits into 4 subnets of /30.
- It splits into 16 subnets of /32.