Dev

Random IP Address Generator

Testing network-aware applications almost always requires a reliable source of random IP addresses that look realistic without exposing any real user data. This random IP address generator lets you produce valid IPv4 or IPv6 addresses in seconds, with full control over quantity and address type. Whether you need a handful of addresses for a quick smoke test or hundreds for seeding a mock database, you can dial in exactly what you need. The generator supports both IPv4 (32-bit dotted-decimal) and IPv6 (128-bit colon-separated hex) formats, so you can test how your application handles either protocol version. Flip the 'Public IPs only' checkbox and the output automatically excludes private ranges — 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, and loopback addresses — giving you routable addresses suitable for simulating external traffic. Common applications include populating synthetic access logs, testing rate-limiting middleware, validating geo-IP lookup services, and stress-testing firewall rules. Because the addresses are randomly generated rather than harvested, you avoid GDPR and privacy concerns that come with using real user IPs in development environments. Generate up to a large batch at once, copy the list, and paste it directly into your test fixtures or seed scripts.

How to Use

  1. Set the Count field to the number of IP addresses you need for your test batch.
  2. Select 'IPv4' or 'IPv6' from the IP Version dropdown depending on your protocol requirements.
  3. Check 'Public IPs only' if your test requires globally routable addresses without private ranges.
  4. Click Generate to produce the list, then copy all addresses with the copy button.
  5. Paste the addresses into your test fixture file, seed script, or log simulator.

Use Cases

  • •Seed mock Nginx or Apache access logs with varied IP traffic
  • •Test rate-limiting middleware that blocks repeated IP requests
  • •Validate geo-IP lookup APIs without exposing real user addresses
  • •Populate firewall allowlists and blocklists for rule testing
  • •Generate IPv6 addresses to test dual-stack application behavior
  • •Create realistic test fixtures for IP reputation or fraud-detection systems
  • •Stress-test network parsers that must handle malformed or edge-case IPs
  • •Fill database seed files with diverse IP address data for staging environments

Tips

  • →Generate a mix of IPv4 and IPv6 by running two separate batches and combining them — this stress-tests dual-stack parsing code.
  • →For rate-limiter testing, generate at least 20-50 unique IPs so your middleware doesn't hit per-IP thresholds prematurely during tests.
  • →When testing geo-IP services, use public IPs only — private ranges like 192.168.x.x will return null or error results from most geo-lookup APIs.
  • →Save generated batches as static fixture files in your repo rather than regenerating at test runtime — keeps tests deterministic and fast.
  • →To test edge cases, leave 'Public IPs only' off so you get private and loopback addresses, then verify your parser handles them gracefully.
  • →If your application stores IPs in a database, generate addresses that include both short and long strings (IPv4 vs IPv6) to catch column-length bugs early.

FAQ

How do I generate only public IP addresses?

Check the 'Public IPs only' checkbox before generating. This filters out private RFC 1918 ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16), loopback (127.0.0.0/8), and link-local addresses. All resulting addresses will be globally routable — suitable for simulating external user traffic or testing geo-IP lookups.

Are these randomly generated IPs real addresses that belong to someone?

They are algorithmically generated and not sourced from any real user or device. Some may coincidentally match addresses assigned to actual servers or ISPs, but no personal data is involved. For sensitive testing environments, enable 'Public IPs only' and document that IPs are synthetic to keep your test data policy clean.

Can I generate IPv6 addresses for testing?

Yes. Select 'IPv6' from the version dropdown to get full 128-bit addresses in standard colon-separated hex notation (e.g., 2001:0db8:85a3:0000:0000:8a2e:0370:7334). These are useful for testing dual-stack parsers, verifying that your application doesn't crash on longer address strings, and simulating modern ISP traffic.

What is the difference between IPv4 and IPv6 for testing purposes?

IPv4 addresses are 32-bit values written as four decimal octets (e.g., 203.45.12.7), while IPv6 are 128-bit values in hex groups. Many applications handle them differently — storage column lengths, regex patterns, and display formatting all vary. Testing both ensures your code doesn't silently break when IPv6 traffic arrives.

How many IP addresses can I generate at once?

Set the Count field to however many you need and click Generate. For large batch needs — such as seeding a database table — generate multiple batches and concatenate them. Copying the full list and pasting into a CSV or JSON array takes only a few seconds.

Can I use these IPs in automated tests or CI pipelines?

Absolutely. Generate a batch, save the list as a test fixture file (JSON array, plain text, or CSV), and commit it to your repository. This gives your CI pipeline deterministic, privacy-safe IP data without hitting a live API at test time. Regenerate the fixture whenever you need fresh variety.

Do the generated IPv4 addresses include reserved or special-purpose ranges?

By default, yes — the generator may produce private, loopback, or link-local addresses. Toggle 'Public IPs only' to restrict output to globally routable addresses. If you specifically need reserved ranges (e.g., to test error handling for non-routable IPs), leave the checkbox unchecked.