IP blacklist checker
Enter an IPv4 address to check it against 17 major DNS blacklists used by email providers and security tools globally.
About this tool
Check any IPv4 against 17 major DNSBLs including Spamhaus, Barracuda, SpamCop, and SORBS. Instant results, browser-based, no signup required.
Enter an IPv4 address to check it against 17 major DNS blacklists used by email providers and security tools globally.
- 1
Enter an IPv4 address in the input field.
- 2
Click Check — the tool queries 17 major DNS blacklists simultaneously.
- 3
Green rows mean the IP is clean on that list; red rows indicate a listing.
- 4
Click the blacklist name for any positive hit to visit the provider's delisting page.
Check whether your mail server's IP is blacklisted if email is bouncing or going to spam.
Verify a new IP before assigning it to a mail server or public-facing service.
Investigate a suspicious IP from server logs to see if it has a history of spam or abuse.
Clean IP
8.8.8.80/17 listed — IP is clean across all checked blacklistsBlacklisted mail server
192.0.2.13/17 listed — Spamhaus ZEN, SpamCop, SORBSCheck own mail server
203.0.113.501/17 listed — UCEPROTECT L1 (delisting available)These answers explain common blacklist check tasks, expected input formats, and edge cases so both visitors and search engines can understand what this tool does.
What is a DNSBL?
A DNS-based Blackhole List (DNSBL) is a database of IP addresses with a history of spam, malware hosting, or other abuse. Email servers query these lists in real time to decide whether to accept or reject incoming mail.
Which blacklists are checked?
17 lists including Spamhaus ZEN, Barracuda, SpamCop, SORBS SPAM, SORBS HTTP, UCEPROTECT L1/L2, DroneBL, NiX Spam, Backscatterer, SpamRATS (Spam/Dyna/NoPtr), Mailspike, PSBL, LASHBACK UBL, and Truncate.
Why is IPv6 not supported?
The DNSBL protocol works by reversing the octets of an IPv4 address and appending the blacklist zone. This mechanism does not map cleanly to IPv6 addresses, so most major DNSBLs only index IPv4 addresses.
My IP is listed — what do I do?
Visit the blacklist's website and use their delisting form. Spamhaus and most other operators provide a self-service removal process once the underlying issue (spam, malware, open relay) has been resolved.