172.16.0.0/31
Private (RFC 1918) RFC 1918Class B — /31 prefix — 2 usable hosts
Network Address
172.16.0.0
Broadcast Address
172.16.0.1
Subnet Mask
255.255.255.254
Usable Hosts
2
First Usable IP
172.16.0.0
Last Usable IP
172.16.0.1
Total IPs
2
Prefix Length
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 172.16.0.1 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 2 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.255.254 is the dotted-decimal equivalent of /31. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 172.16.0.0/31 |
| Network Address | 172.16.0.0 |
| Broadcast Address | 172.16.0.1 |
| Subnet Mask | 255.255.255.254 |
| Wildcard Mask | 0.0.0.1 |
| Prefix Length | /31 |
| IP Address Class | Class B |
| Total IP Addresses | 2 |
| Usable Host Addresses | 2 |
| First Usable IP | 172.16.0.0 |
| Last Usable IP | 172.16.0.1 |
| Network (Hex) | 0xAC100000 |
| Broadcast (Hex) | 0xAC100001 |
| Governing RFC | RFC 1918 |
| Address Type | Private (RFC 1918) |
Binary Representation
Network Address
10101100.00010000.00000000
10101100.00010000.00000000.00000000
Subnet Mask
11111111.11111111.11111111.11111110
The first 31 bits (1s in the mask) identify the network. The remaining 1 bits identify hosts within the network.
All 2 IP Addresses in this Range
172.16.0.0
net
172.16.0.1
bcast
/31 Subnet Reference
Total IPs
2
Usable Hosts
2
Subnet Mask
255.255.255.254
Wildcard
0.0.0.1