Deliverability & inbox testing

Email Blacklist Checker

Check whether a mail server IP or domain is on major email blacklists (DNSBLs) like SpamCop, Barracuda and SORBS. Free, live over DNS, with delisting guidance.

Check a blacklist

Enter a mail server IP or a domain. We resolve the sending IP and check it against major DNSBLs.

What this blacklist checker does

Checks an IP against 10 major DNSBLs
Resolves a domain's sending IP (A, then MX) first
Shows exactly which lists flag the IP
Distinguishes clean, listed and blocked-query results
Scores overall reputation at a glance
Explains delisting steps with AI

Common use cases

  1. 1Diagnosing why your email lands in spam
  2. 2Checking a mail server IP before sending
  3. 3Confirming a delisting request worked
  4. 4Vetting a shared or new IP's reputation
  5. 5Monitoring your sending IPs' health
  6. 6Investigating a deliverability drop

Related tools

IP Reputation CheckerSender Score LookupSpam Score CheckerEmail Header AnalyzerSPF Record CheckerDMARC Record Checker

About email blacklists (DNSBLs)

DNS-based blacklists (DNSBLs) are lists of IP addresses known for sending spam. Receiving mail servers check them in real time and may reject or spam-folder mail from a listed IP — so a single listing can badly hurt your deliverability.

This tool resolves your sending IP and queries the major public lists. If you are listed, visit that list's website to see why and request delisting after fixing the cause. Note that some lists (like Spamhaus) block lookups from public resolvers and may show as "query blocked" here — check those directly on their site.

More Free Tools Where This Came From

This utility is one of dozens of free, no-login tools for DNS, email, SEO and developers — all instant and private.

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HostCloud.in  ·  Pune, India  ·  Serving 34,987+ Websites Since 2020

FREQUENTLY ASKED QUESTIONS

Got Questions? We Have Answers.

What is an email blacklist?

A DNS-based blacklist (DNSBL/RBL) is a list of IP addresses known for sending spam. Receiving mail servers check them and may reject or spam-folder mail from a listed IP.

Can I check a domain, not just an IP?

Yes. Enter a domain and the tool resolves its sending IP — the A record, falling back to the first MX host — then checks that IP against the lists.

Which blacklists are checked?

Ten major public DNSBLs including SpamCop, Barracuda, SORBS, Abuseat CBL, PSBL, UCEPROTECT, NiX Spam and DroneBL, plus Spamhaus where accessible.

Why does a list show "query blocked"?

Some lists, notably Spamhaus, block lookups from public resolvers and return a special code. That is not a listing — check those lists directly on their websites.

How do I get delisted?

Visit the specific blacklist's site to see the reason, fix the underlying issue (compromised host, open relay, spam complaints), then submit their delisting request.

Is the check live?

Yes. Every list is queried in real time over DNS-over-HTTPS — no cached results.