DNS Name Validator

Validate DNS names for proper syntax, length, and RFC 1035 compliance with instant feedback.

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About This Tool

This DNS Name Validator tool allows you to check domain names for proper DNS syntax and RFC 1035 compliance. It validates domain name length, character validity (letters, digits, hyphens), label structure, and ensures the name follows DNS naming conventions. You can validate single or multiple domain names at once, with detailed error reporting for each validation issue. The tool provides clear visual feedback with color-coded results and comprehensive validation reports.

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How to Use

Enter one or more domain names in the input field (separate multiple domains with commas or new lines)
Select validation options: Enable/disable length checking, TLD validation, or RFC 1035 strict mode
Click the 'Validate DNS Names' button to check all domains
View detailed validation results showing which domains are valid and specific errors for invalid ones
Use the 'Clear All' button to reset the form and start over

Frequently Asked Questions

Find Quick Answers

What DNS standards does this validator check against?

The tool validates against RFC 1035 standards for DNS names, checking maximum length (253 characters), label length (63 characters per label), valid characters (letters, digits, hyphens), and proper label structure (cannot start or end with hyphens).

Can I validate multiple domain names at once?

Yes, you can enter multiple domain names separated by commas or new lines. The tool will validate each one independently and provide separate results for each domain.

Does this tool check if a domain actually exists or is registered?

No, this is a syntax validator only. It checks if domain names follow proper DNS naming conventions, but does not verify domain registration, DNS resolution, or availability.

What validation options are available?

You can toggle: Length validation (enforces 253 char max and 63 char per label), TLD validation (checks for valid top-level domain patterns), and RFC 1035 strict mode (enforces all RFC requirements including no leading/trailing hyphens).

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