IP Blacklist Check
Test any IPv4 or IPv6 address against 60+ public DNS-based blacklists (DNSBL/RBL) in real time, including Spamhaus, Spamcop, SORBS, Barracuda, UCEPROTECT, and more.
What this checks
Your IP is queried against 60+ DNS-based blacklists (DNSBLs) used by mail servers and security vendors to flag spam, malware, and abusive senders.
Why it matters
If your sending IP appears on Spamhaus, Spamcop, Barracuda, or SORBS, your email may bounce, land in spam, or get rejected by major mail providers.
If you're listed
Visit the blacklist's website (the zone name in the result) and follow their delisting procedure. Most require fixing the underlying spam, malware, or open-relay issue first.