Random IPv4 Address Generator — Free Test Addresses
Generate a random IPv4 address instantly — realistic dotted-quad test data for network tools and fixtures. Free, client-side IP address generator.
🔒 100% Client-Side Processing
Your data is processed entirely in your browser and never transmitted to any server.
Input
Press Generate — no input needed Output
172.203.18.94 Four independent octets, each a random value from 0 to 255. A fresh address is produced on every click, so this is one sample rather than a fixed result.
Common Use Cases
Seeding test databases
Populate user, session or device tables with plausible addresses for a development environment, so that screens and queries look realistic well before any real traffic exists.
Testing IP-handling code
Generate varied addresses to exercise geolocation lookups, validators and log parsers against something far more representative than the same single fixture being repeated everywhere in tests.
Exercising private-versus-public branches
Because a meaningful share of results land in reserved ranges, a batch of generated addresses will naturally cover the branch that handles non-routable input too.
Anonymising examples for documentation
Replace real client addresses in a screenshot, log excerpt or bug report with invented ones, so nothing published points back at an actual customer host.
Frequently Asked Questions
- What range do generated IPv4 addresses cover?
- Each of the four octets is an independent random value from 0 to 255, so results are spread across the entire address space with no filtering applied. That includes private ranges such as 10.x.x.x and 192.168.x.x, the loopback block, and multicast addresses above 224 — nothing is excluded.
- How often will I get a reserved or private address?
- About one result in seven. Summing the blocks the IETF has reserved gives 13.8% of the total space, and two of them dominate: multicast at 224.0.0.0/4 and the reserved 240.0.0.0/4 account for 6.25% each. The rest — loopback, the private ranges, link-local — add barely more than one percent between them.
- Why does each number stop at 255?
- Every octet is eight bits, which gives 2^8 = 256 distinct values numbered 0 to 255. Four octets make a 32-bit address, so the whole of IPv4 is about 4.3 billion addresses — a ceiling the internet reached, which is precisely why IPv6 and its 128-bit addresses exist.
- Which addresses are safe to publish in documentation?
- RFC 5737 sets aside three blocks purely for examples: 192.0.2.0/24, 198.51.100.0/24 and 203.0.113.0/24, known as TEST-NET-1, 2 and 3. They are guaranteed never to be routed, so anything written using them cannot resolve to a stranger's machine no matter who copies it.
- How do I tell a private address from a public one?
- Three blocks are private by RFC 1918: 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16. Anything inside them is local to a network and never routed across the internet, which is why a generated address in one of those ranges is useless as a stand-in for a real remote client. For hardware fixtures, the MAC Address Generator covers the link layer.
- Is my data private when I use this tool?
- Yes. This tool runs entirely in your browser using client-side JavaScript — nothing you type is transmitted to, logged by, or stored on any server. You can safely process confidential text, tokens, or code.