IP Address Regex Tester
Validate IP addresses with regular expressions
^(?:(?:25[0-5]|2[0-4]\d|1\d{2}|[1-9]?\d)\.){3}(?:25[0-5]|2[0-4]\d|1\d{2}|[1-9]?\d)$Regex Flags
No matches found
Pattern Explanation
^(?:(?:25[0-5]|2[0-4]\d|1\d{2}|[1-9]?\d)\.){3}(?:25[0-5]|2[0-4]\d|1\d{2}|[1-9]?\d)$No explanation available
About IP Address Regex Patterns
IP address validation seems straightforward until you consider edge cases: leading zeros, values over 255, IPv6 compression, and mixed notation. A proper regex ensures syntactic validity while your application logic handles semantic checks.
Our IP regex tester covers both IPv4 and IPv6 patterns, helping you choose the right validation level for your use case.
Why Validate IP Addresss?
Network configuration, access control lists, and logging all involve IP addresses. Invalid IPs cause silent failures, security gaps, or confusing errors. Early validation catches problems before they propagate through your system.
IP validation is also important for security: ensuring user-supplied IPs are syntactically valid before using them in network operations prevents potential injection attacks.
Building the Pattern
IPv4 regex validates four octets:
• Each octet: 0-255 (no leading zeros except for 0) • Separated by dots • Full match: no extra characters
IPv6 is more complex: • Eight groups of 4 hex digits • :: allows zero compression • Mixed notation (IPv4 in IPv6)
Common Use Cases
- Network configuration forms
- Access control list management
- Log analysis and parsing
- Security allowlist/blocklist validation
Pro Tip
For production use, consider using your language's built-in IP parsing (like Python's ipaddress module)—it handles edge cases regex can't easily express.
Other Regex Patterns
Related Design Tools
Explore more free tools to enhance your design workflow