Generates random IPv4 addresses. The "Private" option generates addresses from the RFC 1918 private ranges (10.x.x.x, 172.16-31.x.x, 192.168.x.x). Useful for testing, dummy data, and network documentation. Runs entirely in your browser.
This generator returns dotted-quad IPv4 addresses sampled uniformly from one of three ranges: the public internet (everything outside RFC 1918 / loopback / link-local / multicast), one of the three RFC 1918 private blocks, or a CIDR you supply. The bulk mode produces up to a thousand at a time.
Random "public" IPs are useful for unit tests, log-line generation, and load-test fixtures — but the IPv4 space is almost fully allocated, so every address you generate already belongs to someone. Never point real traffic at randomly-generated IPs. The custom-range mode is the safer option for tests that need a controlled subnet (use a TEST-NET range like 198.51.100.0/24 from RFC 5737).
Anything that is not in the RFC 1918 private space (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16), the loopback (127/8), the link-local 169.254/16 block, or the multicast 224/4 block. The result is a plausible routable IPv4.
No. The IPv4 space has been almost entirely assigned to real organisations for over a decade. Random "public" IPs will hit real hosts — never use them for traffic, only for test data and fixtures.
Provide a CIDR block (for example 198.51.100.0/24) and the tool samples uniformly across the host portion. /32 returns the single address; /0 covers the whole space.
IPv6 random generation is a different problem (128-bit addresses, different reserved ranges, formatting choices around :: and zero-compression). It deserves its own dedicated tool rather than being bolted onto an IPv4 page.
Explore the full suite of NUMBERS tools and 290+ other free utilities at Chunky Munster.