IP Blacklist Check
Check whether an IPv4 address appears on any of 46 major DNS-based blacklists (DNSBL). Blacklisted IPs can have email delivery issues and may be blocked by security systems. Only IPv4 is supported - IPv6 DNSBL coverage is not yet standardised.
DNSBL Category Guide
Different blacklists focus on different types of abuse. Understanding which list flagged your IP helps you determine the right remediation step. If you are new to the topic, our guide explains what a DNSBL is.
| Category | What It Checks | Common Impact |
|---|---|---|
| Spam | IPs that have sent unsolicited bulk email or spam. | Email rejected or sent to junk folder. |
| Abuse | IPs associated with network abuse, malware, or botnets. | Blocked by firewalls and mail servers. |
| Proxy / Tor | Known open proxies, SOCKS proxies, and Tor exit nodes. | Blocked by services that prohibit anonymous access. |
| Dialup / Dynamic | Residential dynamic IP ranges not expected to send email directly. | Outbound email should use an ISP relay or SMTP service. |
| General RBL | Broad real-time block lists combining spam and abuse signals. | Email delivery failures and web access restrictions. |
How to Get Delisted
For a detailed walkthrough of the delisting process, see our guide on how to remove your IP from a blacklist.
- Identify the specific DNSBL(s) where your IP is listed.
- Visit each list's website and look for a removal or delist request form.
- Scan your systems for malware or spam-sending software before requesting removal.
- Contact your ISP if your IP block was listed due to a neighbour's activity.
- Some lists auto-expire listings after 24–72 hours if no new abuse is detected.
Frequently Asked Questions
Why is my IP address on a blacklist?
IP addresses are added to DNS blacklists (DNSBLs) when spam, malware traffic, or an open relay or proxy is observed coming from them. On home connections the cause is often a previous holder of your dynamic IP, an infected device on your network, or a policy listing: some lists, like the Spamhaus PBL, cover entire residential IP ranges that should never send mail directly.
How do I remove my IP from a blacklist?
First fix the underlying cause - Scan devices for malware, secure your mail server, and close open relays - Otherwise the listing will simply return. Then visit the operator of each blacklist that lists you: most, including Spamhaus and Barracuda, offer self-service delisting forms. Many listings also expire automatically after days or weeks once the abusive traffic stops.
Does a blacklisted IP affect normal web browsing?
Usually not. DNSBLs are queried mainly by mail servers, so the most common symptom is rejected or bounced email rather than broken browsing. However, some websites, forums, and security services also use IP reputation feeds, so a badly listed IP can occasionally trigger extra CAPTCHAs, blocked sign-ups, or outright access denials on certain sites.