IP Blacklist Check
Check an IPv4 address against 14 public DNS blocklists (DNSBLs).
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Enter a ip address above and press Run to start the check.
About the IP Blacklist Check
The IP Blacklist Check queries an IPv4 address against 14 public DNS-based blocklists (DNSBLs), including well-known lists such as Spamhaus, to see whether the address has been flagged for spam or abuse. A listing can cause your mail to be rejected or sent to junk, so this is essential when diagnosing email deliverability problems. Each blocklist is checked independently and reported as listed or clean.
How to use
- Enter the IPv4 address of your mail server or host.
- Click Check to query all 14 DNSBLs in parallel.
- Review which blocklists, if any, report the address as listed.
- Visit the listing blocklist's site to request delisting if needed.
Frequently asked questions
- What is a DNSBL?
- A DNS-based blocklist is a database of IP addresses associated with spam or abuse, queried over DNS. Mail servers consult these lists to decide whether to accept incoming mail.
- My IP is listed. How do I get removed?
- Each blocklist runs its own delisting process. Fix the underlying issue first, such as an open relay or compromised host, then submit a removal request on that blocklist's website.
- Can I check an IPv6 address or a domain?
- This tool checks IPv4 addresses only, since most DNSBLs are IPv4-based. Look up your mail server's IPv4 address to test it.