private address

Addresses (10.x, 172.16-31.x, 192.168.x) that home and office networks use inside, which the internet never routes.

The private ranges 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16 (RFC 1918) may be reused by any local network and are not routed on the public internet.

Examples

The greenhouse sensor's 192.168.1.37 is a private address, so the internet can't route a packet to it directly.
172.31.5.5 is private (inside 172.16.0.0/12), but 172.32.5.5 is a public address.