IP Blacklist Check

How to use the blacklist check

1. Enter an IPv4 address, or leave the field empty to check your own.
2. Press Check blacklists. Each list is checked separately and the results appear as they arrive.
3. If an address is listed, the details column shows the code and, when the list provides one, the reason.

What the results mean

Some lists, like the ones for dynamic or "no PTR" addresses, list whole ranges of home connections on purpose. Being on those is normal for a home IP and only matters if you run a mail server.

Why IP blacklists matter

Mail servers check the sending IP against DNS-based blacklists (DNSBLs) before they accept a message. If your mail server's IP is listed, your email may be rejected or sent to spam. A listing usually means one of these happened:

• A computer or server on the network was infected and sent spam.
• A mail server or web form was used as an open relay.
• An email account was compromised and used to send spam.
• The address belongs to a range the list considers unsuitable for sending mail.

How to get delisted

1. Fix the cause first. Scan for malware, close open relays, change passwords of compromised accounts and check your mail logs.
2. Set up email authentication: SPF, DKIM and DMARC, and a matching reverse DNS record.
3. Request removal on the website of each list that shows "Listed". Most lists offer a free self-service form.
4. Wait. Many lists remove addresses automatically after a period without spam.

Read the full guide: how to check and remove an IP from blacklists.

Frequently asked questions

Why is only IPv4 supported?

Most blacklists only track IPv4 addresses, because IPv6 networks are so large that listing single addresses is not practical.

My home IP is listed. Should I worry?

Usually not. Several lists include all dynamic home addresses because legitimate mail servers rarely run on them. It does not affect browsing or sending mail through your provider or Gmail.

How often are blacklists updated?

Most update continuously. A new listing can appear within minutes of spam being reported, and removals can take from minutes to several days depending on the list.

Last updated October 20, 2026 by the FindMyIPLocation team.