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DKIM checker

Look up the DKIM TXT record for a domain and selector and read back its tags, public key and settings in plain terms.

Type a domain and a selector, then press Check DKIM
The tool looks up the TXT record at selector._domainkey.domain and reads its tags, public key, and settings back in plain terms.

A DKIM selector cannot be listed out of DNS; the mail operator picks it, so this tool resolves exactly one name per run. Finding a record proves it is published, not that it is correct: the tool does not verify RSA or Ed25519 signatures, does not match the key against a received mail header, and an empty p= is reported as revoked rather than guessed around.
Options

More network tools

- Live DNS lookup (/network/dns)
- DNS explainer (/network/dns-explain)
All network tools (/network)

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Canonical HTML: https://nutter.tools/network/dkim-checker
Markdown version: https://nutter.tools/network/dkim-checker.md
Plain-text version: https://nutter.tools/network/dkim-checker.txt
Agent index: https://nutter.tools/llms.txt