- No data uploaded
- Instant results
Regex for IPv4 Address
Pattern: /\b(?:(?:25[0-5]|2[0-4]\d|1?\d?\d)\.){3}(?:25[0-5]|2[0-4]\d|1?\d?\d)\b/g. Test it below and adapt it to your data — validation regexes are always a trade-off between strictness and real-world inputs.
Regex for IPv4 Address
Matches/\b(?:(?:25[0-5]|2[0-4]\d|1?\d?\d)\.){3}(?:25[0-5]|2[0-4]\d|1?\d?\d)\b/g
Hosts 192.168.1.10, 10.0.0.255 and invalid 999.1.1.1
| # | Match | Index | Groups |
|---|---|---|---|
| 1 | 192.168.1.10 | 6 | — |
| 2 | 10.0.0.255 | 20 | — |
JavaScript (ECMAScript) regular expressions. Without the g flag only the first match is used by String.match — this tester always lists all matches.
Frequently asked questions
Is my data uploaded?
No. The calculation runs entirely in your browser — nothing you type is sent to a server.
Is it free?
Yes — free, unlimited and no sign-up.