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Tools

DNS Record Inspector Look up A, AAAA, MX, TXT, NS, CAA and other records, from a public resolver or straight from the authoritative nameservers.
DNSSEC Chain Validator Follow the chain of trust from the parent DS record to the zone's DNSKEY and signatures, and see what validating resolvers conclude.
Registrar & Nameserver Check Compare the nameservers set at the registry with what the authoritative servers report, and check each server responds correctly.
SSL Certificate Checker Check whether a site serves HTTPS, when its certificate expires, whether browsers will trust it, and how HTTP traffic is redirected.
Email Authentication Checker Check SPF, DKIM and DMARC: the records inboxes use to decide whether your mail is genuine, and whether they are strict enough to stop spoofing.
DNS Propagation Checker Compare what public resolvers around the world currently return with the authoritative answer, and see how long cached data will last.
WHOIS Lookup See who a domain is registered with, when it was registered and expires, and whether it is locked against theft, straight from the registry.
Email Blacklist Check Emails landing in spam? See whether your mail server or domain is on a spam blacklist that mail providers check, why it was listed, and how to get removed.

Not sure where to start? Run them in order, from records to email. How the checks work

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Tools

DNS Record Inspector
DNSSEC Chain Validator
Registrar & Nameserver Check
SSL Certificate Checker
Email Authentication Checker
DNS Propagation Checker
WHOIS Lookup
Email Blacklist Check

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DNS Record Inspector

Look up A, AAAA, MX, TXT, NS, CAA and other records, from a public resolver or straight from the authoritative nameservers.

Domain name

Enter a domain or hostname. Pasted URLs and internationalized names work too.

Record types

A AAAA CNAME MX TXT NS SOA CAA DS DNSKEY

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Free, read-only DNS diagnostics. Every finding is based on live query results, and every query is listed so you can reproduce it.

Quick DNS lookup

Tools

DNS Record Inspector
DNSSEC Chain Validator
Registrar & Nameserver Check
SSL Certificate Checker
Email Authentication Checker
DNS Propagation Checker
WHOIS Lookup
Email Blacklist Check

Learn

All guides
DNS Record Types Explained: A, CNAME, MX, TXT & More
SPF, DKIM and DMARC Explained (Gmail & Yahoo Rules)
Why Are My Emails Going to Spam? How to Find and Fix It

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