🚫 IP Reputation & Blocklist Check

Is Your IP Blacklisted?

Check your IPv4 address against the spam blocklists that answer public DNS queries. A list that does not answer its own test entry is left out, not counted as clean.

🛡
Ready to test
Click “Check My IP” to run the blocklist checks
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Not listed / answered
🌐
Your IPv4 Address
The address the blocklists are asked about, with its network and country
Pending ▼
Run the check to detect your IP address.
🚨
SpamCop SCBL
Addresses reported by SpamCop users as sending spam - asked first for its test entry, 127.0.0.2
Pending ▼
Run the check to see SpamCop status.
🐟
Barracuda BRBL
Barracuda Reputation Block List, used by Barracuda email gateways - asked first for its test entry, 127.0.0.2
Pending ▼
Run the check to see Barracuda status.
⛔
Spamhaus (SBL, XBL, PBL)
Not checkable from a browser - and not part of the score
Not checkable ▼
Spamhaus refuses lookups that come through public DNS resolvers, and a browser can only ask through one. Asked that way, it answers 127.255.255.254 for every address - its code for “query refused”, not a listing - so any answer here would say nothing about you. This page does not send your address to Spamhaus. Its own lookup is at check.spamhaus.org.

How This Check Works

A blocklist (a DNSBL) is published in DNS. To ask whether 203.0.113.7 is listed, a mail server looks up 7.113.0.203. followed by the list’s zone: an answer in 127.0.0.x means listed, no such name means not listed. A browser cannot send DNS queries itself, so this page asks through Cloudflare’s DNS-over-HTTPS resolver - and blocklists treat public resolvers differently from mail servers. Some refuse them, and some stop answering from one location or another.

So every run first asks each list for its own test entry, 127.0.0.2, which a working list always reports as listed. A list that does not is shown as not checkable from here, your address is not sent to it, and it is left out of the score. The score is the number of lists that answered and do not list you, out of the lists that answered. SORBS, which this page used to ask, no longer exists in DNS at all.

Why Shared Addresses Get Listed

A VPN server’s address, or a mobile carrier’s shared (CGNAT) address, is used by many people at once. If one of them sends spam or runs a compromised machine, the address is listed for all of them. A listing can get mail sent from that address refused, and some sites use these lists to decide whom to challenge or block.

What to Do If Your IP Is Listed

  • On a VPN: connect to a different server, then run the check again
  • Request removal: SpamCop listings expire on their own once the reports stop; Barracuda has a removal request form
  • Use a dedicated IP: some VPNs offer an address only you use, so only your own traffic affects its reputation
  • On your own connection: a listing usually means a device on your network is sending spam - check it for malware first