IP Blacklist Check
ServerCheck if an IP is on spam blacklists (DNSBL).
How it works
Checks whether an IPv4 address appears on well-known DNS blacklists (DNSBLs) — the spam-source lists that mail servers consult. If your mail is landing in spam or being rejected, a blacklisting is a common cause.
Enter your mail server's IP (not your website's) to diagnose delivery problems.
Try an example
If listed, follow each provider's delisting process (the link in the detail line). Fix the underlying cause first, or you'll be relisted.
About the IP Blacklist Check
If your email lands in spam, your sending IP may be on a blacklist. This free IP blacklist checker tests any IPv4 address against major DNS-based blacklists (DNSBLs) like Spamhaus, SpamCop and Barracuda, so you can find and fix reputation problems.
Results come from live DNSBL queries.
How to check an IP blacklist
- Enter the IPv4 address to test (often your mail server's sending IP).
- See which blacklists, if any, list it.
- Follow each provider's delisting process to clear a listing.
What to do if your IP is listed
A listing means a blacklist has seen spam or abuse from that IP. First find and fix the cause — a compromised device, an open relay, or a misconfigured mail server. Only then request delisting on the specific blacklist's site, since re-listing is immediate if the problem persists. If you're on a shared IP, a bad neighbour may be responsible and you may need your provider's help.
Frequently asked questions
What is a DNSBL blacklist?
A DNS-based blacklist is a published list of IP addresses associated with spam or abuse. Mail servers check these lists to decide whether to accept your email.
Why is my IP blacklisted?
Common causes include a compromised device sending spam, a shared IP used by a bad neighbour, or a misconfigured mail server. Fix the source, then request delisting.
How do I get removed from a blacklist?
Each blacklist has its own delisting form. First resolve the underlying issue, then submit a removal request on the provider's site.
How do I get removed from a blacklist?
Each blacklist runs its own delisting process on its website. Resolve the underlying spam or abuse first — delisting before fixing the cause just gets you re-listed. Some lists remove entries automatically after a clean period.