Random IP Address Generator
Use the CaseSwitch Random IP Address Generator to produce random IPv4 dotted quads for docs, tests, and UI mocks. Octets are drawn with `crypto.getRandomValues()`. Prefer documentation ranges (RFC 5737) when examples might leak into production.
Written by the CaseSwitch editorial team. We maintain these tools in the browser so drafts, keys, and images stay on your device.
Last reviewed: 23 July 2026
Uses secure browser randomness when available. Nothing is sent to a server.
Examples
Sample output shape — five IPv4 strings
Input
quantity: 5
Output
(illustrative — not allocated to you) 203.0.113.44 10.16.8.2 198.51.100.7 172.31.255.1 8.8.8.8
Sample output shape — single address
Input
quantity: 1
Output
(illustrative) 192.0.2.91
Documentation ranges to prefer (not from the button)
Input
RFC 5737 TEST-NET reminders
Output
192.0.2.0/24 · 198.51.100.0/24 · 203.0.113.0/24
Format anatomy
Input
Four octets 0–255
Output
A.B.C.D (each A–D independent secure ints)
Sample use — form placeholder
Input
quantity: 1 for a settings mock
Output
(illustrative) 203.0.113.10
How to use
- Set quantity to how many IPv4 strings you need.
- Generate and copy the list.
- For public docs, prefer replacing random hits with 192.0.2.0/24, 198.51.100.0/24, or 203.0.113.0/24 (TEST-NET) before you publish.
What this tool is for
Fill forms, unit tests, and teaching materials with syntactically valid IPv4 addresses. The tool does not allocate real addresses, does not scan the network, and does not constrain private versus public space unless you filter afterward.
How it works
Each address is four independent integers from 0–255 joined with dots. Quantity defaults to five (up to 100). Results may look public, private (10/8, 192.168/16, etc.), loopback, or multicast purely by chance.
When to use it
Screenshot form fillers, placeholder datasets, teaching dotted-quad format, and synthetic logs where the exact address does not matter.
When not to use it
Claiming ownership of a random public IP, pointing scanners or attacks at generated addresses, or putting random IPs into production allowlists. For stable documentation examples, hard-code TEST-NET addresses instead of a live random draw.
How it compares to related tools
The UUID Generator is an opaque id, not a network address. The Random Number Generator yields one integer, not four octets. Password generation is unrelated.
Common mistakes
Publishing a generated IP that happens to be a real machine as “ours,” using 127.0.0.1 in client-facing docs when you meant TEST-NET, and assuming every output is RFC 1918 private.
TEST-NET and honest examples
Random public-looking addresses may belong to real networks. For blogs, READMEs, and screenshots that might be copied into configs, substitute RFC 5737 TEST-NET addresses so operators do not page the wrong people.
IPv4 only
This generator does not emit IPv6. Build v6 fixtures in your test suite or another specialized tool if you need them.
Frequently asked questions
Are these real addresses on the internet?+
They are valid IPv4 syntax. Some correspond to real allocations. Use TEST-NET ranges for documentation when you can.
Can I generate IPv6?+
Not on this page. Use a dedicated IPv6 fixture generator in your stack.
Is sampling cryptographically random?+
Each octet uses `crypto.getRandomValues`-backed secure integer sampling.
Can I limit to private IPs?+
Not as a built-in filter. Generate several and keep RFC 1918 hits, or hard-code private examples.
Do you store generated IPs?+
No. They remain in the browser until you copy or refresh.
Is 0.0.0.0 or 255.255.255.255 possible?+
Yes — every octet independently spans 0–255, so special addresses can appear.
Are these values cryptographically secure?+
Random generators use crypto.getRandomValues() in your browser for secure randomness where supported.
Related tools
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Primary keys across services, correlating logs between front end and API, seeding fixtures in a demo database, and generating a local test resource id without hitting a server.
Random Number Generator
Classroom raffles, load-test IDs, sprint poker numbers, Monte Carlo toy demos, and filling numeric columns in mock CSV. Document the range if the result matters later.
Strong Password Generator
New account signups, rotating a password after a breach notification, creating an app-specific password, and seeding a password manager vault when the manager’s own generator is unavailable. Sixteen characters with mixed classes is a practical floor for most sites in 2026.