What This Tool Does
The Microapp Random IP Address Generator produces fake (but format-valid) IP addresses for testing, mockups, log examples, and any other situation where you need an IP address that looks real but doesn't point at any actual server. Supports both IPv4 and IPv6. Runs in your browser, no server, no rate limit.
Common uses: seeding test databases, populating mock API responses, anonymizing real IPs in shared logs, generating fixture data for unit tests.
How to Use It
- Pick IPv4 or IPv6.
- Click "Generate" — a random address appears instantly.
- Click again for a different one. Click "Generate batch" to get 10, 50, or 100 at once.
- Click "Copy" to put the result on your clipboard.
192.168.45.207, 10.234.12.198, 173.45.220.81Sample IPv6:
2001:0db8:85a3:0000:0000:8a2e:0370:7334
IPv4 vs IPv6, Briefly
IPv4 uses 32-bit addresses written as four 0-255 numbers separated by dots: 192.168.1.1. The total address space is about 4.3 billion. The internet has been growing past this limit since the early 2010s — IPv4 addresses are now scarce enough that ISPs use NAT (Network Address Translation) to share single IPs across many devices.
IPv6 uses 128-bit addresses written as eight groups of four hex digits separated by colons: 2001:0db8:85a3::8a2e:0370:7334. The total address space is roughly 3.4 × 10³⁸ addresses — enough for every grain of sand on Earth to have its own IP. Adoption has been gradual; in 2026, about 40% of internet traffic is IPv6.
Reserved IP Ranges (And What the Generator Avoids)
Several IP ranges are reserved for specific purposes — using them in fake test data could be misleading. The Microapp generator can be configured to skip these:
| Range | Purpose |
|---|---|
| 0.0.0.0/8 | "This network" — never used as source/destination |
| 10.0.0.0/8 | Private network (RFC 1918) |
| 127.0.0.0/8 | Loopback (your own machine) |
| 169.254.0.0/16 | Link-local (DHCP failure addresses) |
| 172.16.0.0/12 | Private network (RFC 1918) |
| 192.168.0.0/16 | Private network — most home routers use this |
| 198.18.0.0/15 | Network benchmark testing |
| 224.0.0.0/4 | Multicast |
| 240.0.0.0/4 | Reserved (former "Class E") |
For test data that needs to look like real public internet IPs, generate from the unreserved space (most of 1.0.0.0 through 223.255.255.255, excluding the ranges above).
The 192.0.2.0/24, 198.51.100.0/24, and 203.0.113.0/24 Ranges
For documentation, examples, and educational material, three small IPv4 ranges are explicitly reserved by RFC 5737 as "TEST-NET":
192.0.2.0/24— TEST-NET-1198.51.100.0/24— TEST-NET-2203.0.113.0/24— TEST-NET-3
For IPv6, the equivalent is 2001:db8::/32. These addresses will never be assigned to real public devices, so using them in documentation, blog posts, screenshots, or training material is the safest choice — there's zero chance of accidentally pointing at a real machine.
Common Use Cases
Test fixtures and unit tests. Need a realistic IP in a test? Generate one. Beats hand-typing 1.2.3.4 in every test.
Mock API responses. When designing an API that returns user IPs, populate the design mock with realistic-looking data. Real IPs in mocks could leak privacy if shared.
Log analysis tutorials. Showing how to grep logs for malicious IPs? Use generated examples instead of real ones — avoids accidentally accusing a real internet user of doing something they didn't.
Database seeding. Populating a development database with a few thousand sample users? Generated IPs add realism without privacy risk.
Common Pitfalls
Treating generated IPs as anonymous. Random ≠ anonymous. If you need to anonymize real IPs (for analytics, GDPR compliance), don't replace them with random ones — that destroys the signal you might want for fraud detection. Use proper anonymization techniques (hashing, truncation to /24).
Generating IPs in private ranges by accident. A "random" 32-bit number lands in 192.168.x.x about 0.3% of the time and in 10.x.x.x about 0.4% of the time. The Microapp generator filters these out by default — but if you're rolling your own, remember to.
IPv6 abbreviation. IPv6 addresses can be abbreviated by dropping leading zeros and using :: for one consecutive run of zero groups. 2001:0db8:0000:0000:0000:0000:0000:0001 = 2001:db8::1. The Microapp generator outputs the full form by default; copy and paste accepts both.
Related Tools
For generating other types of random data, see the Random Number Generator. To work with hash-based identifiers (an alternative to random data for some uses), the UUID Generator is the right tool. For generating realistic random names alongside IPs in test fixtures, see the Random Name Generator.