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DEVELOPER UTILITY

IP Blacklist Check

See whether an address appears on selected DNSBLs—useful context for SMTP issues and incident notes.

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What is a DNSBL?

DNS-based blacklists publish addresses or ranges associated with spam or abuse. Mail servers may reject or score mail based on these lists, but listing reasons and delisting processes differ per zone.

How to use this tool

Enter the IP. Run the check. Read each list’s policy if listed. Use the full tool for batch or historical context.

Use cases

Mail deliverability debugging, abuse desk triage, verifying clean IPs after remediation, education on reputation systems.

Privacy and security

Lookups and probes may be sent through WebStatus.in infrastructure to reach public DNS, HTTP, or reputation systems. Only query targets you are authorized to test, and avoid pasting secrets into any network tool.

Frequently asked questions

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IP Blacklist Check