SanchitGurukul • Networking Tools
DKIM Validator
Check a DKIM selector in DNS, parse the published public-key record, and troubleshoot common configuration problems.
DKIM
Privacy & external DNS notice: The domain and selector you submit are sent to this website for the current check and queried through the selected public DNS-over-HTTPS resolver. This plugin does not intentionally save submitted values or DNS results. The selected resolver may process requests under its own privacy policy. Do not submit confidential internal domains.
Lookup name:
selector1._domainkey.example.comPublished DKIM Record
Parsed Tags
Checks & Findings
What this validator checks
DNS publication
Queries selector._domainkey.domain for TXT records and identifies DKIM-looking answers.
Tag syntax
Parses common DKIM key tags such as v=, k=, p=, h=, s=, t=, and n=.
Public key
Checks whether the p= value exists, is valid Base64, and estimates RSA key size where possible.
Deployment issues
Flags duplicate selector records, revoked keys, malformed values, weak RSA keys, unexpected versions, and DNS lookup failures.
DKIM validation flow
Domain + Selector→DNS TXT Lookup→Parse DKIM Tags→Inspect Public Key→Report
Important: This tool validates the published DKIM public-key record. It does not verify a specific email message signature. Full message verification also requires the email headers/body and the exact DKIM-Signature header.
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