IP Blacklist Check

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Frequently Asked Questions

What is DNSBL (blacklist)?

DNSBL (DNS-based Blackhole List) is a database of IP addresses caught sending spam or engaging in malicious activity. Mail servers check senders against these databases and may reject emails from blocked IPs.

Why is my IP blacklisted?

Reasons: sending spam (intentional or due to compromise), botnet participation, dynamic IP range from ISP, shared hosting with bad neighbors, or your IP was previously owned by a spammer.

How to remove IP from blacklist?

1) Fix the cause of blocking (viruses, open relays). 2) Visit the specific blacklist website. 3) Find "Delist" or "Removal" section. 4) Follow instructions - some lists auto-remove after 24-48 hours.

How do blacklists affect email delivery?

If your IP is blacklisted, emails may: go to spam, be rejected entirely, or be delayed. Major providers (Gmail, Outlook) use Spamhaus, Barracuda and other lists for filtering.

Which blacklists are most important?

Spamhaus (SBL, XBL, PBL) - most influential, used by most providers. Barracuda BRBL - popular in corporate sector. SpamCop - important for mass mailings. SORBS and UCEProtect - additional lists.

Checked Databases

Spamhaus

SBL, XBL, PBL, ZEN - world's leading blacklist

Barracuda

BRBL - popular in business

SpamCop

Auto-expiring list

SORBS

10+ specialized lists

+ 70 more databases

UCEProtect, DroneDB, PSBL, CBL...