Free tools

Check a record, generate one, or do the maths — no account needed.

12 tools across 4 families

Email authentication

Check an SPF record for the faults that silently break it, and count every DNS lookup it costs.

Email authentication

Build a valid SPF record from the senders you actually use, and see the DNS-lookup cost before you publish it.

Email authentication

Find a domain’s DKIM key, read its tags in plain words, and flag a weak, revoked or malformed one.

Email authentication

Read a DMARC record in plain words, and see exactly what a receiver does with mail that fails.

Email authentication

Build a DMARC record step by step, from monitoring through to full enforcement.

Email authentication

See SPF, DKIM, DMARC and MX for one domain together, with the fixes in the order to do them.

DNS and domains

See where a domain receives mail, in priority order, with the faults that stop it.

DNS and domains

Query any DNS record type from two resolvers at once, so a change still spreading is easy to spot.

DNS and domains

Check whether a name is registered at the registry, across endings or a whole list at once.

DNS and domains

See a domain’s registrar, its dates and every status code explained, read from RDAP rather than old WHOIS.

Messaging

Count a text message the way a carrier does, and see how many segments it costs.

Pricing

Turn a cost into a price or a price into a cost, and see markup and margin as the two different numbers they are.