Blacklisted IP

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Contents
1 What is a blacklisted IP?
2 If your IP is blacklisted
3 How to find out if your IP is blacklisted
4 How to try to get your IP removed from blacklists

What is a blacklisted IP?

Every website and mail server is on an IP, a numeric address to identify the server. The IPs for servers that are known or believed to send out spam typically end up on some or all of over 100 email blacklists. These blacklists are called domain name system blacklists (DNSBL), DNS blacklists, or realtime blacklists (RBL). Each blacklist has its own criteria of what must happen for an IP to be on their list and for how long, and some blacklists are better maintained than others.

Most email servers use one or more of these blacklists to identify probable spam and to prevent it from reaching its intended recipients.

Having spammers' IPs blacklisted is good for everyone except spammers. However, sometimes those IPs are used for other sites as well, or the spammers stop using those IPs but they remain blacklisted for future users. Or email sent using those IPs may have been misidentified as spam, resulting in the IP being on a blacklist by mistake.

If your IP is blacklisted

If your site or mail server is using a blacklisted IP, your email recipients may not receive your email. You need to either get your IP off of the blacklist(s) or change to a non-blacklisted IP. This can be done by changing the IP itself or by changing your web hosting provider or ISP, depending on where the blacklisted IP is.

How to find out if your IP is blacklisted

A number of websites have IP blacklist checkers. Do a search for "blacklist IP check" or "blacklist IP checker" and then enter your IP at one or more of the sites in the search results. Not every blacklist IP checker site will check all IP blacklists, so you may need to go to more than one site to find out which IP blacklists have your IP in their database.

How to try to get your IP removed from blacklists
Sometimes you can get your IP removed from a blacklist after making contact at the site for the IP blacklist(s) that your IP is on. After identifying which blacklist(s) list your IP, go to the websites for those blacklists, read their removal procedures, and contact the site administrators with the information they ask for. If the IP is for your website, you can ask your web host to take these steps.
Some IP blacklists remove IP after a period of time, possibly a day or less, has elapsed since the last spam complaint was received. If your IP is listed by one of these IP blacklists and the spam has stopped, you may only need to wait.