Random IP Generator

Random IP addresses are used to test network software — load balancers, firewalls, rate limiters, geolocation services, logging dashboards, and security tools — without exposing real infrastructure. Developers generate random IPs for fixture data, QA teams use them to simulate traffic patterns, and writers use them for documentation examples. They are also handy whenever you need placeholder addresses that look realistic.

A public IP address is globally routable on the internet and unique worldwide; it is what your home router gets from your ISP. A private IP address (RFC 1918: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16) is only meaningful inside a local network and is reused by millions of networks. This generator can produce either — choose Private for LAN fixtures or Public for internet-style fixtures.

RFC 1918 defines three private ranges: 10.0.0.0 – 10.255.255.255 (a single /8, the most common for large corporate networks), 172.16.0.0 – 172.31.255.255 (sixteen /16 blocks, the middle range), and 192.168.0.0 – 192.168.255.255 (65,536 addresses, the classic home router range). A fourth special range, 100.64.0.0/10, is used by carriers for CGNAT and is selected here as its own scope.

An IPv6 address is 128 bits long (vs 32 bits for IPv4), written as eight groups of four hex digits separated by colons, like 2001:0db8:85a3:0000:0000:8a2e:0370:7334. Leading zeros in a group can be dropped, and one run of zero groups can be replaced by "::" to shorten it — so the example becomes 2001:db8:85a3::8a2e:370:7334. This tool can output full or compressed forms. Common scopes: 2000::/3 global unicast, fe80::/10 link-local, fc00::/7 unique local, and ::1 loopback.

A loopback address is a special address a device uses to talk to itself. In IPv4 it is the entire 127.0.0.0/8 block, with 127.0.0.1 (localhost) by far the most common — it is what you use to test local web servers. In IPv6 the loopback is simply ::1. Generating loopback-range addresses is useful when testing software that must handle local traffic specially.

A multicast address identifies a group of hosts that all receive the same traffic, rather than a single destination. In IPv4, multicast lives in 224.0.0.0/4 (for example 224.0.0.251 is mDNS, 224.0.0.1 is all-hosts). In IPv6, multicast starts with ff, for example ff02::1 all-nodes and ff02::fb mDNS. Multicast is used for streaming video, routing protocols, and service discovery.

Never assign a randomly generated address to a real device or route real traffic to it — it may belong to someone else on the internet. Generated IPs are meant for test fixtures, documentation, simulations, and development. If a fixture needs to be truly non-routable, pick Private (RFC 1918), Loopback, or Link-local scopes, which are reserved and will never collide with real public hosts.

Yes — completely free, no registration, and 100% private. All generation happens locally in your browser; nothing is sent to any server. The tool works offline after the page loads.