Blacklist Check
Check if your IP address is on spam blacklists – 18 active DNSBL databases with reason and delisting link.
Results for 216.73.216.193
| Blacklist | Status | Reason / delisting |
|---|---|---|
| Spamhaus ZEN (zen.spamhaus.org) | Clean | – |
| SpamCop (bl.spamcop.net) | Clean | – |
| Barracuda (b.barracudacentral.org) | Clean | – |
| Mailspike (bl.mailspike.net) | Clean | – |
| PSBL (psbl.surriel.com) | Clean | – |
| blocklist.de (bl.blocklist.de) | Clean | – |
| DroneBL (dnsbl.dronebl.org) | Clean | – |
| Truncate (GBUdb) (truncate.gbudb.net) | Clean | – |
| SpamRATS Spam (spam.spamrats.com) | Clean | – |
| S5H.net (all.s5h.net) | Clean | – |
| NordSpam (bl.nordspam.com) | Clean | – |
| Spam Eating Monkey (bl.spameatingmonkey.net) | Clean | – |
| InterServer RBL (rbl.interserver.net) | Clean | – |
| SPFBL (dnsbl.spfbl.net) | Clean | – |
| UCEPROTECT Level 1 (dnsbl-1.uceprotect.net) Policy list | Clean | – |
| UCEPROTECT Level 2 (dnsbl-2.uceprotect.net) Policy list | Clean | – |
| SpamRATS Dynamic (dyna.spamrats.com) Policy list | Clean | – |
| SpamRATS NoPtr (noptr.spamrats.com) Policy list | Clean | – |
Articles related to this tool
How the Blacklist Check Works
Our blacklist check tests your IP address against over 50 known DNS blacklists (DNSBLs) simultaneously. These lists are used by email servers and firewalls to block spam and malware. The result shows whether and on which lists your IP is listed, and provides guidance on removal.
What is a DNS blacklist?
A DNSBL (DNS-based Blackhole List) is a database of malicious IP addresses, queryable via the DNS protocol. Before accepting a connection, mail servers ask: "is the sender IP in list X?" — if yes, the mail is rejected or marked as spam. Well-known lists: Spamhaus SBL/XBL/PBL, Barracuda BRBL, SORBS, SpamCop, SURBL. We check your IP simultaneously against more than 50 of them.
Why does an IP end up on a blacklist?
- Sending spam — your own or triggered by malware.
- Open mail relay — server accepts mail from strangers without authentication.
- Dynamic IP range — preventively listed on Spamhaus PBL (Policy Block List).
- Botnet membership — device is part of a spam-sending network.
- Broken SPF/DKIM/DMARC — misconfiguration in the mail setup.
- Recipient complaints — users mark mails as spam.
Listed — what now?
Fix the cause first, then request delisting. This order is decisive — requesting delisting without root-cause analysis lands you back on the list within 24h. Full step-by-step instructions in the article How to Remove Your IP from a Blacklist. Typical wait times: Spamhaus PBL automatic, SBL/XBL 1-3 business days, Barracuda 12-24 hours, SpamCop automatic after 24-48h.
Preventive measures for mail-server operators
Set up monitoring — services like MXToolbox offer free email alerts for new listings. Set sending limits, implement bounce handling, use double opt-in for newsletters. On suspicion of botnet infection, run an antivirus scan immediately + router-firmware update + password changes. For mail servers with static IPs, SPF, DKIM and DMARC are no longer optional but mandatory — all three correctly set significantly reduces listing risk.
Frequently Asked Questions about Blacklist Check
What is an IP blacklist?
An IP blacklist (DNSBL) is a database of IP addresses identified as spam sources or for malicious activity. Email servers and firewalls use these lists to block suspicious traffic.
Why is my IP on a blacklist?
Common reasons: your computer or router was compromised and is sending spam, your ISP previously assigned the IP to a spammer, or a misconfigured email server on your network. Sometimes entire IP ranges are listed.
How can I remove my IP from a blacklist?
First fix the cause (remove malware, correctly configure email server). Then apply for removal (delisting) at each blacklist individually. Most lists offer a web form for this. Some remove IPs automatically after some time.