Domain Name Validator
Validate domain name format per RFC 1035/5891, check label and total length, verify TLD, and detect IDN domains.
Enter a domain name above to validate
We'll check format, label lengths, TLD, and IDN detection
What we check
Format Check
Validating domain name format and character set
Label Length
Verifying each label is between 1 and 63 characters
Total Length
Checking total domain length is within 253 characters
TLD Validation
Verifying the top-level domain is valid
IDN Detection
Detecting internationalized domain name (punycode or non-ASCII)
Learn More
Learn how domain name validation works, DNS naming rules, label constraints, and TLD types.
What Is a Domain Name?
A domain name is a human-readable address that maps to a numeric IP address on the internet. Instead of remembering 93.184.216.34, users can type example.com into their browser. The Domain Name System (DNS) translates these names into IP addresses behind the scenes.