Private Range
172.16.0.0/12 Private Range
The 172.16.0.0/12 block is a private range spanning 172.16.0.0 to 172.31.255.255 — about 1 million addresses. Its subnet mask is 255.240.0.0.
Range details
| Property | Value |
|---|---|
| CIDR | 172.16.0.0/12 |
| Mask | 255.240.0.0 |
| Usable addresses | 1,048,574 |
| Routable on internet | No — private (RFC 1918) |
Why private ranges exist
RFC 1918 set aside these blocks for internal networks so organisations do not consume scarce public IPv4 space. Traffic to the internet is translated to a public address by NAT.
Frequently asked questions
What is the 172.16.0.0/12 range used for?
It is a private (RFC 1918) range for internal networks, not routable on the public internet. Devices reach the internet through NAT.
Is 172.16.0.0/12 public or private?
Private. It is reserved by RFC 1918 and cannot be routed on the public internet.
What is the subnet mask for 172.16.0.0/12?
The mask is 255.240.0.0.
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