SuperMailOS
Start free

Free tool · no signup

Every DNS record, one lookup.

A, AAAA, MX, TXT, NS, CNAME and CAA records for any domain or subdomain, side by side, plus the DNS host that runs the zone, read from its nameservers.

01 The record types

What each record does.

DNS is a set of typed records. These seven cover a website and its email.

A and AAAA

The IPv4 and IPv6 addresses a name points to: where browsers, and some mail checks, connect.

MX

Which servers accept email for the domain, in priority order. No MX, no inbound mail.

TXT

Free-form text used for SPF, domain verification and more. DKIM and DMARC live on subdomains of it.

CNAME

An alias: this name is really that name. Can't sit alongside other records at the same name.

NS

The nameservers that are authoritative for the zone, which tells you where to edit it.

CAA

Which certificate authorities may issue TLS certificates for the domain.

02 Questions

Common questions.

Something else? Write to us — a real person answers, usually the same day.

Talk to us
Why don't I see my new record yet?+
We query live DNS, but resolvers cache answers for the record's TTL. If you just changed a record, the old value can linger until its TTL expires, typically minutes to an hour.
Why are DKIM and DMARC records missing?+
They live on their own names: DMARC at _dmarc.yourdomain and DKIM at selector._domainkey.yourdomain. Look those names up directly, or use the email checker, which finds them for you.
How do I find out who hosts my DNS?+
The NS records name the nameservers, and the nameservers usually name the host. We match them against the major providers and show the result next to your records.

03 More free tools

Keep checking.

Each tool answers one question about a domain's email. All free, no signup.

All free tools ▶
DNS & domains→

Who sends email for a domain

Mailbox host and every sending service behind a domain, read from MX, SPF and DKIM.

Authentication→

Email deliverability checker

SPF, DKIM, DMARC, MX and MTA-STS in one pass, with a score and the fix for anything that fails.

DNS & domains→

Domain age checker

Registration date, expiry and registrar from official RDAP data, and what age means for mail.

Set up email without touching DNS.

Every domain you run in one inbox, from $3 a mailbox. 14 days free, no card.

Start free Talk to us