Notable IP addresses / 172.16.0.1

172.16.0.1
172.16.0.1 — private address (172.16/12)

Private (RFC 1918) addressNot owned — private range

First usable address of the 172.16.0.0/12 private block (172.16.0.0 – 172.31.255.255), the least-used of the three RFC 1918 ranges.

Docker's default bridge network uses 172.17.0.0/16 and AWS VPC defaults use 172.31.0.0/16, so 172.x addresses appear constantly in developer and cloud logs. They are private and unrelated to the public 172.x blocks owned by real ISPs — 172.15.x.x and 172.32.x.x, for example, are public.

Related addresses

10.0.0.1
10.0.0.1 — private gateway address
192.168.1.1
192.168.1.1 — default router address

Frequently asked questions

Is every 172.x.x.x address private?

No — only 172.16.0.0 through 172.31.255.255. Addresses outside that window are ordinary public IPs.