IP Address Validator
Check format, version, range, CIDR notation, and reachability in one click. Free, no account needed.
Enter an IP address above to start validation
We check format, version, range, CIDR, and reachability
What we check
Format Check
Validating IP address format and structure
Version Detection
Detecting IPv4 or IPv6 version
Range Classification
Classifying IP range (private, loopback, public, etc.)
CIDR Notation
Validating CIDR notation if present
Reachability Check
Checking if the address is publicly routable
Learn More
IP address formats differ between IPv4 and IPv6. Learn how to validate both quickly and correctly.
What Is IP Address Validation?
IP address validation confirms that a given string is a correctly formatted IPv4 or IPv6 address. With two distinct formats in active use across the internet, it is important to validate both the structure and the range of any IP address before using it in network code.