Does the public-only option really skip private ranges?

Yes. It excludes RFC 1918 private blocks (10/8, 172.16/12, 192.168/16), carrier-grade NAT (100.64/10), loopback, link-local, documentation TEST-NET ranges and multicast/reserved space.

Can I reach these addresses?

No host is contacted. The addresses are random sample values for test fixtures, mock data and documentation — they are not pinged or looked up.

Is any data uploaded?

No. Addresses are generated locally in your browser and nothing is transmitted.

Random IP Address Generator

Random IPv4 & IPv6 addresses, public-only option included.

Random IP address generator

Generate random IPv4 and IPv6 addresses for test fixtures, mock data and documentation. For IPv4 you can keep public addresses only enabled to skip private and reserved ranges — RFC 1918 (10.x, 172.16–31.x, 192.168.x), carrier-grade NAT (100.64.x), loopback, link-local, the TEST-NET documentation blocks and multicast.

Nothing is pinged or looked up — addresses are random sample values generated entirely in your browser and never transmitted.