Blacklist Lookup

Blacklist Lookup Tool

Our Blacklist Lookup tool checks your IP address or domain against 20+ major DNS-based blacklists (DNSBL) to ensure your server isn't flagged for spam or malicious activity. Being blacklisted can severely impact your email deliverability and website reputation.

What is a DNSBL?

A DNS-based Blacklist (DNSBL) is a database of IP addresses and domains that have been reported for sending spam, hosting malware, or engaging in other malicious activities. Email servers and security systems use these blacklists to filter out unwanted traffic.

Why Check Blacklists?

• Email Deliverability: If your server is blacklisted, your emails may be rejected or marked as spam
• Website Reputation: Blacklisted IPs can affect your SEO and user trust
• Server Security: Being blacklisted may indicate your server has been compromised
• Business Impact: Poor email deliverability can hurt customer communication and sales

Blacklists We Check

Our tool queries 20+ major blacklist databases including:

• Spamhaus (ZEN, SBL, XBL, PBL)
• SpamCop
• SORBS (multiple variants)
• Barracuda
• UCEPROTECT (Levels 1, 2, 3)
• PSBL, EmailBasura, DroneBL
• And many more...

How to Use

1. Enter your IP address or domain name
2. Click "Check Blacklist"
3. Review the results showing which blacklists (if any) have flagged your server
4. Take action to delist if necessary

What to Do If Blacklisted

If your IP or domain is blacklisted:

1. Identify the cause: Check for compromised accounts, spam complaints, or malware
2. Fix the issue: Remove malware, secure your server, stop spam sources
3. Request delisting: Visit each blacklist's website to request removal
4. Monitor regularly: Use this tool to ensure you stay off blacklists

Best Practices

• Check your server regularly (weekly or monthly)
• Implement proper email authentication (SPF, DKIM, DMARC)
• Monitor outgoing email for spam complaints
• Keep your server secure and updated
• Use reputable email service providers