DNS and email
DNS lookup
Look up A, AAAA, MX, TXT, NS and CNAME records for a domain.
What this checks
DNS records map a domain to the servers behind it: A and AAAA for addresses, MX for mail, NS for nameservers, CNAME for aliases and TXT for verification and policy records.
This tool queries DNS directly from your browser using DNS-over-HTTPS and shows the records by type. Nothing is sent to our servers.
Why it matters
DNS is where a site quietly breaks: a changed A record points the domain at the wrong place, a dropped MX record stops email, a removed TXT record breaks verification.
Changes can come from a host migration, a registrar tweak or someone editing the wrong zone, and they are invisible until something stops working.
How to fix common failures
Confirm the records
Check A and AAAA point at the right host and MX points at the right mail provider.
Watch the TTL
A long TTL means a change takes time to propagate. Lower it before a planned migration.
Keep a record of expected values
Know what good looks like so an unexpected change stands out.
DNS lookup is one check. Janitor watches DNS changes automatically across every client site and puts it in a branded report.
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Related
FAQ
DNS lookup FAQ
How does the lookup work?
It queries public DNS from your browser using DNS-over-HTTPS. There is no server in the middle and no sign-up.
Which record types does it show?
A, AAAA, MX, TXT, NS and CNAME. These cover most of what you need to confirm a domain is configured correctly.
Can Janitor alert me when DNS changes?
Yes. Janitor snapshots a domain records and alerts you when any of them change, which is one of the most useful checks on a client site.
Get started
Check it once, or watch it for every client
Janitor runs around two dozen checks on every site you manage and turns them into a branded report.
30-day free trial. No credit card required.