172.16.0.0/13
Private (RFC 1918) RFC 1918Class B — /13 prefix — 524,286 usable hosts
Network address — the base address of the block (172.16.0.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 172.23.255.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 524,286 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.248.0.0 is the dotted-decimal equivalent of /13. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 172.16.0.0/13 |
| Network Address | 172.16.0.0 |
| Broadcast Address | 172.23.255.255 |
| Subnet Mask | 255.248.0.0 |
| Wildcard Mask | 0.7.255.255 |
| Prefix Length | /13 |
| IP Address Class | Class B |
| Total IP Addresses | 524,288 |
| Usable Host Addresses | 524,286 |
| First Usable IP | 172.16.0.1 |
| Last Usable IP | 172.23.255.254 |
| Network (Hex) | 0xAC100000 |
| Broadcast (Hex) | 0xAC17FFFF |
| Governing RFC | RFC 1918 |
| Address Type | Private (RFC 1918) |
Binary Representation
The first 13 bits (1s in the mask) identify the network. The remaining 19 bits identify hosts within the network.
Subnet Breakdown — splitting into /14
This /13 block can be divided into 2 /14 subnets.
| CIDR | Network | Broadcast | First Usable | Last Usable | Hosts |
|---|---|---|---|---|---|
| 172.16.0.0/14 | 172.16.0.0 | 172.19.255.255 | 172.16.0.1 | 172.19.255.254 | 262,142 |
| 172.20.0.0/14 | 172.20.0.0 | 172.23.255.255 | 172.20.0.1 | 172.23.255.254 | 262,142 |