happytails.ai

DNS name length checker

Paste one DNS name per line.

Process up to 500000 input characters and 20000 records locally. Reports export completely up to 40 million characters and 500000 CSV records. Analysis is local with a 10-second timeout. Preview tables show the first 200 rows; your data is not uploaded. Up to 500,000 characters. Review the settings before running.

Your result

Report a problem or share an idea.

How to use DNS name length checker
  1. Paste text or JSON in the documented format.
  2. Review the bounded report and explicit assumptions.
  3. Download complete JSON or CSV.

Useful next steps

DNS zone diffHTTP cache policy analyzerIP allowlist overlap checker

Know the interpretation limits

Paste one DNS name per line. Labels are measured in UTF-8 bytes against 63-octet limits and the absolute wire name against 255 octets. IDNA conversion is not performed.

Keep the complete report

Search and sort apply to the first 200 rows. Download JSON or CSV for every row and the assumptions.