/13 Subnet
524,288 total IPs — 524,286 usable hosts.
Example /13 Networks
| CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|
| 10.0.0.0/13 | 10.0.0.0 | 10.0.0.1 | 10.7.255.254 | 10.7.255.255 | 524,286 |
| 172.16.0.0/13 | 172.16.0.0 | 172.16.0.1 | 172.23.255.254 | 172.23.255.255 | 524,286 |
| 172.24.0.0/13 | 172.24.0.0 | 172.24.0.1 | 172.31.255.254 | 172.31.255.255 | 524,286 |
| 192.168.0.0/13 | 192.168.0.0 | 192.168.0.1 | 192.175.255.254 | 192.175.255.255 | 524,286 |
| 192.168.0.0/13 | 192.168.0.0 | 192.168.0.1 | 192.175.255.254 | 192.175.255.255 | 524,286 |
| 10.0.0.0/13 | 10.0.0.0 | 10.0.0.1 | 10.7.255.254 | 10.7.255.255 | 524,286 |
How /13 Compares
| Prefix | Total IPs | Usable Hosts | Subnet Mask | Typical Use |
|---|---|---|---|---|
| /10 | 4,194,304 | 4,194,302 | 255.192.0.0 | Enterprise regional segment |
| /11 | 2,097,152 | 2,097,150 | 255.224.0.0 | — |
| /12 | 1,048,576 | 1,048,574 | 255.240.0.0 | RFC 1918 Class B range |
| /13 ◀ | 524,288 | 524,286 | 255.248.0.0 | — |
| /14 | 262,144 | 262,142 | 255.252.0.0 | — |
| /15 | 131,072 | 131,070 | 255.254.0.0 | — |
| /16 | 65,536 | 65,534 | 255.255.0.0 | Cloud VPC CIDR, campus network |
Frequently Asked Questions
How many IPs are in a /13?
A /13 subnet contains 524,288 total IP addresses and 524,286 usable host addresses. The network address (first IP) and broadcast address (last IP) are reserved and cannot be assigned to hosts.
What is the subnet mask for /13?
The subnet mask for a /13 is 255.248.0.0.
In CIDR notation, the prefix length /13 means
the first 13 bits of the address are the network portion.
The wildcard (inverse) mask is 0.7.255.255.
How many /13 subnets fit in a /12?
Exactly 2 — a /12 can be split into two /13 subnets of equal size. Each /13 subnet has 524,286 usable hosts, compared to 1,048,574 in the parent /12.