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The Complete IP Blacklist Guide
Everything you need to know about IP reputation, blocklists, and how to fix a "dirty" IP.
Quick Answer
1. How Does an IP Get Blacklisted?
Blacklists are safety measures for the internet. An IP address usually ends up on a blocklist for one of the following reasons:
- Spamming: Sending a high volume of unsolicited emails.
- Malware Activity: Your computer or server is infected and communicating with a command-and-control server.
- Botnet Participation: Your IP is being used in a Distributed Denial of Service (DDoS) attack.
- Open Proxies: Having a misconfigured server that anyone can use to hide their own identity.
2. Major Blacklist Providers
Not all blacklists are created equal. The most influential ones that can actually break your service include:
- Spamhaus: The gold standard. If you're on their list, almost no one will receive your emails.
- Barracuda: Used by millions of enterprise firewalls.
- SORBS: Focuses heavily on open relays and spammy network ranges.
How to Get Off a Blacklist
Follow these exact steps:
- Scan for Malware: Ensure your network is clean before asking for removal.
- Identify the List: Use our Blacklist Check tool to see exactly where you are listed.
- Visit the Source: Go to the website of the blacklist (e.g., spamhaus.org).
- Request Removal: Most lists have a "Lookup" or "Delist" tool. Follow their instructions carefully.
3. Why it Matters for You
Even if you aren't a spammer, you can inherit a blacklisted IP address from your ISP or a VPN provider. This can lead to "IP Banning" on websites like Wikipedia, Craigslist, or online games.
Are You Blacklisted?
We check over 50 major DNSBL and RBL databases in real-time to see if your IP is flagged.
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