Blacklist Lookup


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About Blacklist Lookup

? What is the Blacklist Lookup Tool?

The Blacklist Lookup tool on pcjow.com is a free utility that checks whether a domain name or IP address is listed on common DNS-based blacklists (DNSBLs). These blacklists are used by email servers and cybersecurity systems to block spam, malware, and other malicious activity.

If your site or server is blacklisted, your emails might go to spam, or your site may be blocked for users — this tool helps you find out quickly.

⚙️ How Does It Work?

When you enter a domain or IP address, the tool checks it against multiple public blacklists, such as:

  • Spamhaus

  • SORBS

  • Barracuda

  • Spamcop

  • UCEPROTECT

  • and many more

It then shows a list of all the blacklists checked and indicates whether your domain/IP is listed or clean on each.

? Who Should Use It?

This tool is essential for:

  • Website owners checking domain or IP reputation

  • Email marketers ensuring deliverability of newsletters

  • System admins monitoring outgoing server IPs

  • Cybersecurity teams investigating spam or abuse reports

  • Anyone troubleshooting poor email or website performance

? Step-by-Step Usage Guide

  1. Go to: pcjow.com/blacklist-lookup

  2. Enter your IP address or domain name

  3. Click the “Check Blacklist” button

  4. The tool will:

    • Scan dozens of blacklist databases

    • Display which lists (if any) your domain/IP is on

    • Mark results as “Listed” or “Not Listed”

  5. Use this data to request delisting or fix issues causing blacklisting

✅ Pros

  • ✔️ Free and easy to use

  • ✔️ Checks multiple blacklists at once

  • ✔️ Essential for email reputation and website safety

  • ✔️ Supports IPv4, IPv6, and domain names

  • ✔️ Helps avoid email deliverability issues and domain penalties

⚠️ Limitations

  • ❌ Does not automatically remove your domain/IP from blacklists

  • ❌ Some blacklists may require manual access or have limited public info

  • ❌ Tool may not detect temporary or recently removed listings

  • ❌ Cannot resolve blacklisting causes (e.g., malware, open relays)