Free DNS, Email & Security Lookup Tools

Look up DNS records, email authentication, blacklist status, and domain registration info — with plain explanations.

Domain name

What do you want to look up?

Blacklist Look Up

Looks up whether this domain's IP address (or the IP address you entered) appears on common email blacklists (DNSBL) — being listed can cause outgoing mail to be rejected or sent to spam.

Also look up blacklist status when I run this search

How to use this tool

Pick a lookup type from the dropdown, or type a shortcut straight into the field — e.g. mx:example.com, all:example.com, spf:example.com, whois:example.com — and press Enter.
Enter a domain name (e.g. example.com), or an IP address for PTR and blacklist look ups.
Toggle "Also look up blacklist status" above to include a DNSBL look up alongside your search.
Your last 20 look ups are saved in the History panel so you can revisit them anytime.

Why it matters

ServerRecords is a free DNS and email diagnostics toolbox. Check A, AAAA, MX, TXT, CNAME, NS, SOA, CAA and SRV records, verify SPF, DKIM, DMARC, BIMI, MTA-STS and TLSRPT email authentication, run a DNSSEC and blacklist (DNSBL) check, inspect HSTS and HTTP security headers, look up WHOIS registration and IP ownership (ASN), and generate SPF, DMARC and strong passwords — all from one page, with every result explained in plain language instead of raw technical output. You can also check at a glance whether a domain is available or already registered, and results are grouped into clear category tabs with a severity rating for each finding.

Examples

Run a full DNS health check after moving hosting to confirm A/AAAA, MX and nameservers all point where they should.
Diagnose why email lands in spam by checking SPF, DKIM, DMARC and blacklist status together in one pass.
Audit a domain you just inherited: WHOIS expiry, DNSSEC status, HTTPS redirect and security headers at a glance.
Check whether a domain is available before committing to a project name — or see its registrar, expiry date and DNS host if it is already taken.

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