IP Address Regex Validator
Validate IPv4 and IPv6 addresses with regex patterns. Check for private/reserved ranges, CIDR notation, and subnet validity.
IP Address Validator
Regex Patterns
/^((25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(25[0-5]|2[0-4]\d|[01]?\d\d?)$/Full IPv6 regex patternExample IPs
What is IP Address Regex Validator?
IP Address Regex Validator provides precisely engineered regular expressions for validating IPv4 and IPv6 addresses according to IETF standards RFC 791 RFC 2460 RFC 4291 for IPv6 text representation. IP address validation is a common task in security auditing checking if an IP falls in private ten x slash eight one seventy two dot sixteen through thirty one slash twelve one ninety two dot one sixty eight slash sixteen ranges log analysis parsing access logs firewall logs WAF logs and network administration configuring firewall rules ACLs VPN configurations. Many naive IP regex patterns accept invalid addresses like nine nine nine dot nine nine nine dot nine nine nine dot nine nine nine or reject valid IPv6 forms. This validator implements IPv4 patterns that correctly check each octet is zero through two hundred fifty five no leading zeros by default configurable matches IPv6 in all RFC-compliant forms including compressed double colon notation zero-suppressed hextets mixed IPv4-mapped IPv6 colon colon ffff colon one ninety two dot zero dot two dot one two eight and CIDR suffix notation slash twenty four slash sixty four slash one twenty eight. Additional checks classify whether an IP is public private RFC 1918 loopback one twenty seven dot zero dot zero slash eight colon colon one link-local one sixty nine dot two fifty four slash sixteen fe80 colon colon slash ten multicast or reserved documentation range TEST-NET one ninety two dot zero dot two slash twenty four. Test individual IPs bulk lists or CIDR blocks then copy the patterns correctly escaped for Java Python Go MySQL or PCRE-compatible tools.
When to Use IP Address Regex Validator
Use when parsing server access logs, validating IPs in sign-up fraud detection, building firewall rule validators, classifying IP ranges for geo-IP lookups, or writing network monitoring parsers.
How to Use IP Address Regex Validator
Select IPv4, IPv6, or both. Enter addresses individually or in bulk. View validation status, classification public/private/loopback/etc., and copy production-tested regex patterns pre-escaped for your language.
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