IP Address Validator

A precise, real-time validator for IPv4 and IPv6 addresses, designed for developers and IT teams to verify syntax, CIDR, and classification.

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About This Tool

This tool validates IPv4 and IPv6 addresses for correctness and formatting. It supports individual addresses and CIDR notation. It reports validity status detected version and a normalized form.
Conceptually it parses input by version rules applies range checks and can classify as private or public. If CIDR is requested it validates the prefix and network range.
Use cases include validating API payloads logs and configuration data. Developers IT admins and security teams benefit from precise error messaging and canonical forms for consistent data workflows. It provides a compact and reliable foundation for data quality checks across automation pipelines and security controls.

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How to Use

Provide inputs by entering the IP address in ip_input and optionally selecting version Auto IPv4 or IPv
Enable CIDR validation if your input includes a network prefix.
Optionally enable strict mode to reject leading zeros in IPv4 octets.
Run validation to obtain is_valid detected_version and normalized_ip.
Use the outputs to populate configs logs or security checks.

Frequently Asked Questions

Find Quick Answers

What is a valid IPv4 address?

A valid IPv4 address consists of four decimal octets separated by dots. Each octet ranges from 0 to 255. Leading zeros are treated as decimal and may be normalized in output. The tool reports exact positional errors.

Can the validator handle IPv6 compression?

Yes. The validator accepts full and compressed IPv6 forms using the :: shorthand and normalizes to a canonical lowercase representation while preserving the network prefix when CIDR is provided.

Does CIDR support affect validation?

CIDR support validates both the address and the prefix length. Prefix lengths must be between 0 and 128 bits for IPv6 or 0 to 32 bits for IPv4. Invalid ranges yield a specific error reason.

What standards govern the validation?

Validation follows RFC 4291 for IPv6 and RFC 4632 4634 for IPv4 and CIDR semantics ensuring consistent syntax and network range interpretation across implementations.

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