DNS & Email

DNS records, SPF, DKIM & DMARC

DNS Lookup

Query A, AAAA, MX, TXT, CNAME, NS & SOA records.

WHOIS Lookup

Registrar, dates and ownership for any domain.

SPF Checker

Validate SPF records and spot lookup limits.

DKIM Checker

Inspect DKIM selectors and public keys.

DMARC Checker

Check DMARC policy, alignment and reporting.

Overview

DNS & Email: what these tools do

Many outages and email delivery problems trace back to a DNS record. These tools query live DNS to show what a domain actually publishes, check who it is registered with and when it expires, and validate the SPF, DKIM and DMARC records that receiving mail servers use to authenticate your messages.

Use cases

Common tasks

Confirm that a new A, MX or TXT record is being served

Find the registrar, expiry date and nameservers of a domain

Check an SPF record for syntax errors and the 10-lookup limit

Verify that a DKIM public key is published for a selector

Review a DMARC policy and where its reports are sent

Learn more

Related guides

All DNS & Email guides

DNS Propagation Explained: Why DNS Changes Take Time and How to Check Them

Guide · 11 min read

SPF, DKIM and DMARC Explained: How Email Authentication Works

Guide · 14 min read

Keep exploring

Other categories

IP & Network

Your IP, IP lookup & ASN

Security

SSL, passkeys & hashing

Developer Tools

Format, decode, generate & inspect

Converters

Unix timestamps & dates