IPv4 Address
Match valid IPv4 addresses with each octet constrained to 0–255.
Try it in RegexPro →Available in
Pattern
(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?) (flags: g)Raw source: (?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?)
How it works
Examples
Input
192.168.1.1Matches
192.168.1.1
Input
255.255.255.0Matches
255.255.255.0
Input
999.999.999.999No match
—Common use cases
- •Network configuration validation
- •Parsing server log files
- •Firewall rule generation
- •IP address extraction from text
Related patterns
IP Address with CIDR Notation
NetworkingMatch IPv4 addresses with CIDR prefix notation such as 10.0.0.0/8 or 192.168.1.0/24.
Private IP Address (RFC 1918)
NetworkingMatch IPv4 addresses in the RFC 1918 private ranges: 10/8, 192.168/16, and 172.16/12.
IPv6 Address
NetworkingMatch full (non-compressed) IPv6 addresses written as eight colon-separated hextets.
MAC Address
NetworkingMatch 48-bit MAC addresses written with colon or hyphen separators (e.g. 00:1A:2B:3C:4D:5E).
Related concepts
Alternation with the | Operator
ConceptThe pipe | matches either the expression on its left or on its right. Combine with groups to alternate over a subpattern.
How to Match a Specific Number of Characters
How-toUse {n} for exactly n, {n,} for n or more, {n,m} for between n and m. Apply to any single token — character, class, or group.
How to Match Multiple Patterns (Alternation)
How-toCombine patterns with | to match either option. Wrap alternatives in a group to scope the alternation correctly.