IP Blacklist Check
Check whether an IPv4 address is listed on major spam and abuse DNS blacklists.
Looks up live data What you enter is sent to our server to fetch live results from public sources. Results are cached briefly. A Cloudflare Turnstile bot check runs when you press the button (it loads a script from challenges.cloudflare.com and may show a short challenge).
A Cloudflare Turnstile bot check runs when you press the button (it loads a script from challenges.cloudflare.com and may show a short challenge).
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About this tool
Check whether an IPv4 address is listed on well-known DNS blacklists: SpamCop, Barracuda, DroneBL, PSBL and UCEPROTECT level 1. A listing usually means the address has been seen sending spam or running compromised software, and it can cause email from that IP to be rejected. Lookups are made over DNS-over-HTTPS. Some blacklists refuse queries from public resolvers; those, and any list that does not answer, are reported as unavailable rather than clean. Spamhaus is not queried because it refuses public resolvers, so a clean result does not cover Spamhaus; check it on spamhaus.org. SORBS and CBL were dropped (shut down or merged into Spamhaus).
How to use it
- Enter the IPv4 address, such as the one your mail server sends from.
- Press Check blacklists.
- Review how many lists include the address and which ones.
- If it is listed, follow the delisting steps on that list's website.
Why an IP gets blacklisted
- A compromised account or device
- A stolen mailbox password or a malware-infected computer sends spam through your connection or mail server.
- An open relay or proxy
- A mail server or proxy that accepts traffic from anyone is found and abused quickly. DroneBL focuses on these.
- Spam traps
- Mail sent to old or harvested addresses that list operators run as traps, usually from bought or stale mailing lists.
- Shared or recycled addresses
- On shared hosting or a cloud server, another customer or the previous user of the IP may have caused the listing.
How to get your IP delisted
- Note which lists show the IP. Each list's own lookup page usually gives the reason or date of the listing.
- Find and stop the cause: change compromised passwords, scan the machines on that network, close open relays and check your mail logs for outgoing spam.
- Check your sending setup: a reverse DNS (PTR) name for the IP, and SPF, DKIM and DMARC records for your domain. Receivers check these alongside blacklists.
- Request removal on each list's website, or wait if that list expires entries on its own (see below).
- Check again after a day or two. If the IP is listed again, the cause is still active.
Removal for each blacklist checked here
- SpamCop (bl.spamcop.net)
- Listings come from user spam reports and expire automatically once the reports stop, usually within 24 hours. There is nothing to request.
- Barracuda (b.barracudacentral.org)
- Submit the removal request form on barracudacentral.org with the IP, a contact email and what you fixed. Barracuda reviews each request.
- DroneBL (dnsbl.dronebl.org)
- Lists open proxies, hijacked hosts and botnet machines. Look the IP up on dronebl.org and request removal once the host is clean.
- PSBL (psbl.surriel.com)
- Built from spam traps. Removal is self-service on psbl.org.
- UCEPROTECT Level 1 (dnsbl-1.uceprotect.net)
- Entries expire automatically about 7 days after the last spam is seen. The operator sells express delisting; waiting is free.
Common problems
- A list shows "resolver-blocked (inconclusive)"
- That list does not answer queries from public resolvers. The result is unknown, not clean; check it directly on the list's website.
- Your IP is listed
- Find and fix the cause first (compromised account, open relay, shared hosting neighbour), then request removal from the list.
- IPv6 address
- Only IPv4 addresses are supported.
Frequently asked questions
Does being listed always mean my mail will be blocked?
No, but receivers that use that list may reject or flag mail. Impact depends on the list and the receiver.
Does a clean result mean my IP is not blacklisted anywhere?
No. This checks five lists. Spamhaus, one of the most widely used, refuses lookups from public resolvers, so check it on spamhaus.org. Lists shown as unavailable are unknown, not clean.
Should I pay for express delisting?
Rarely. The lists checked here remove entries for free, on request or automatically once the spam stops. Paying does not help if the cause is still active, because the IP is listed again.
Why is my home IP address blacklisted?
Home addresses are shared and reassigned, and an infected device on your network can send spam without you noticing. If you send mail through a provider such as Gmail or Outlook, your mail leaves from their servers, so a listing on your home IP usually does not affect it.