Free tools
The DNS checks we run for customers, free for anyone
FreeNo accountWorks without JavaScript
Each tool below is the same engine DoDomain uses to connect and verify customer domains, pointed at a domain you type in. The record checks read the zone's own authoritative nameservers, not a cache (the SPF checker follows its includes through a public resolver), and they say not probed where they did not look rather than guessing. No account, no JavaScript required.
Find the DNS host
1 toolDNS provider detector
Which DNS host serves a domain, and whether one-click setup is available there.
Check records
4 toolsDNS propagation checker
One record, read from the authoritative nameservers and three public resolvers.
SPF record checker
Parse a domain's SPF, walk its includes, count the lookups against the limit of ten.
CNAME chain checker
Follow aliases and flag loops, apex CNAMEs and possible flattening.
Domain verification diagnoser
Compare a domain with its expected target and find the provider's fix instructions.
Compare
1 toolDNS record diff
Compare a live DNS snapshot with the expected records you paste in.
Need this inside your product?
The provider detector is POST /api/v1/domains/check in the DoDomain API, and the verification behind the propagation checker is what runs on every custom-domain connection. The free plan includes both.