172.16.0.0/12 (Private Network Range)
PrivateRFC 1918
172.16.0.0/12 at a glance
| CIDR block | 172.16.0.0/12 |
|---|---|
| First address | 172.16.0.0 |
| Last address | 172.31.255.255 |
| Total addresses | 1,048,576 |
| Subnet mask | 255.240.0.0 |
| Prefix length | /12 |
| Type | Private |
| Publicly routable | No |
| Defined in | RFC 1918 |
Open in CIDR calculator/12 subnet details
What is 172.16.0.0/12 used for?
172.16.0.0/12 is the middle-sized RFC 1918 private range, covering 172.16.0.0 to 172.31.255.255. It is less common in home networks than 192.168.0.0/16, which is why Docker and AWS draw their defaults from it. Addresses in 172.32.0.0 and above are public, not private.
Common subnets of 172.16.0.0/12
Overlaps and conflicts
- Contains 172.16.0.0/16
- Contains 172.17.0.0/16
- Contains 172.31.0.0/16
FAQ
Is 172.32.0.0 a private IP address?
No. The private range ends at 172.31.255.255. Addresses from 172.32.0.0 upward are public.
What is the subnet mask for 172.16.0.0/12?
255.240.0.0. It covers the sixteen /16 networks from 172.16.0.0/16 to 172.31.0.0/16.