IP Blacklist (DNSBL) Checker
Is your IP address or domain blacklisted?
Check whether an IP address or domain is on major email and spam blacklists, with a clear explanation of every result. Free, no signup.
13 IP blacklists · 3 domain lists · reverse DNS checkCheck an IP address or domain
Enter an IP to check it. Enter a hostname to check the IP addresses it points to and the domain itself. To check a mail server, enter the IP or hostname that actually sends your email.
Which blacklists are checked?
- Spamhaus ZEN (zen.spamhaus.org)
- SpamCop (bl.spamcop.net)
- UCEPROTECT Level 1 (dnsbl-1.uceprotect.net)
- PSBL (psbl.surriel.com)
- DroneBL (dnsbl.dronebl.org)
- S5H (all.s5h.net)
- NiX Spam (manitu) (ix.dnsbl.manitu.net)
- InterServer RBL (rbl.interserver.net)
- SpamRATS Spam (spam.spamrats.com)
- SpamRATS Dyna (dyna.spamrats.com)
- SpamRATS NoPtr (noptr.spamrats.com)
- Mailspike BL (bl.mailspike.net)
- Backscatterer (ips.backscatterer.org)
- Spamhaus DBL (dbl.spamhaus.org, domains only)
- SURBL (multi.surbl.org, domains only)
- URIBL (multi.uribl.com, domains only)
Before reporting a list as "Clean", the tool tests that the list is actually answering. A list that does not respond to its own test entry is shown as "Unverified" instead of a misleading "Clean".
Read this before you worry: being listed on one small list does not always affect delivery, and a clean result is not a promise of inbox placement. Big mailbox providers also look at SPF, DKIM, DMARC, reverse DNS, sending volume and complaints. Results come from DNS queries made by this server at the moment you click, and lists change often.
How to use the IP Blacklist (DNSBL) Checker
- Enter the IPv4 address of your mail server or website, or a hostname such as
mail.yourdomain.com. - Click Check blacklists. All lists are queried at the same time and the check usually takes a few seconds.
- Read the verdict, then open the table: each row shows whether the list says Listed, Clean, Blocked, Unverified or gave no answer, with the reason for any listing.
- Check the reverse DNS line. Mail servers should have a PTR record that points back to the same IP.
- Follow the What to do next steps: fix the cause first, then use the list's own lookup page to request removal.
About the IP Blacklist (DNSBL) Checker
A DNS blacklist (DNSBL), also called a real-time blackhole list (RBL), is a list of IP addresses and domains that are linked to spam, malware, compromised machines or other abuse. Mail servers and security tools ask these lists, through ordinary DNS lookups, whether an IP address is listed before accepting a message. If your IP address is on a well-known list, your email can be rejected, sent to spam or delayed, and some firewalls can block your traffic.
This IP blacklist checker sends your IP address, or the IPs behind a hostname, to a set of respected blacklists at the same time, including Spamhaus ZEN, SpamCop, UCEPROTECT, PSBL, DroneBL, SpamRATS and Mailspike. When you enter a hostname it also checks the registered domain against domain blacklists such as the Spamhaus DBL, SURBL and URIBL. It decodes the answer codes, so you see why an IP is listed, for example a known spam source, an exploited or infected host, or a dynamic IP range.
The tool separates real reputation listings from policy listings. Lists such as the Spamhaus PBL and SpamRATS Dyna simply say that an address belongs to a dynamic or residential range that should send mail through a provider's relay. That is not a sign of bad behaviour, so it is reported as a policy listing, not a blacklisting.
It is also built not to mislead you. Each list is tested with its own test entry, so a list that has stopped working shows as Unverified rather than a false "Clean". Refusals, such as Spamhaus rejecting queries from public DNS resolvers or sending an over-limit response, show as Blocked, never as a listing. Answers that look like DNS hijacking are shown as errors. For mail servers it also looks up the reverse DNS (PTR) record and confirms that it points back to the same IP, a basic check that many receiving servers apply.
Frequently asked questions
What is a DNSBL or RBL?
It is a DNS-based blacklist: a list of IP addresses or domains with a bad reputation, queried through DNS by mail servers and security tools to decide whether to accept, flag or block traffic.
Why is my IP address blacklisted?
Common causes are a compromised website or account sending spam, malware on a computer, an open mail relay, a bulk mailing with many complaints or bounces, or a new IP in a range with a poor history. Find and fix the cause before asking for removal.
Is a Spamhaus PBL listing a problem?
The PBL lists address ranges that should not send email directly to other mail servers, such as dynamic or residential IPs. It is a policy list, not a sign you did something wrong. Send your mail through your provider's mail server instead.
How do I get my IP removed from a blacklist?
First stop the cause of the problem. Then open the list's lookup page, read the reason and follow its removal process. Many listings expire on their own after the problem stops. Reputable lists do not require payment for standard removal.
What does "Blocked" mean in the results?
The list refused the query from this server's DNS resolver, usually because it blocks public resolvers or the query limit was exceeded. It does not mean your IP is listed, only that the list could not be checked from here.
What does "Unverified" mean?
The list returned "not listed", but it did not answer its own test entry, so it may be offline or retired. The result cannot be trusted either way.
Does a clean result guarantee my email reaches the inbox?
No. Delivery also depends on SPF, DKIM and DMARC, reverse DNS, content, sending volume, bounce and complaint rates, and each mailbox provider's own filters.
Does this tool store the IPs I check?
No. The addresses are used for the DNS lookups and are not saved. Only a short-lived count per visitor is kept to enforce usage limits.