---
title: Why Is the IP Address Blacklisted?
description: "In simple words about suspicious activity, \"blacklists\" and possible reasons for getting your IP-address into them."
---

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# Why Is the IP Address Blacklisted?

## This article provides information about suspicious activity, "blacklists", and possible reasons why your IP address might be on them.

"**Blacklists**" are databases of suspicious IP addresses. These may be addresses from which suspicious activity has been detected (e.g., spam, DDoS attacks, and other illegal activities). Often, IP addresses of legitimate users end up on a "blacklist". For example, several recipients of your company's mailing list complain about spam, or the mailing does not comply with the rules of mailing services – all this can be a reason for adding an address to the "blacklist". In addition, these databases typically contain addresses for testing.

Different "blacklists" use different algorithms for detecting "suspicious" addresses. Therefore, one IP address may be in one database and not in another.

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