IP Blacklist Check
IP blacklist check — scan a public address for spam, abuse, and attack-related DNS blocklist listings.
About this tool
See whether a public IP appears on widely used reputation blocklists — the same signals mail servers and security filters consult for spam, compromised hosts, and abusive traffic. Useful before troubleshooting email delivery or migrating outbound mail.
What you get
- Overall verdict: clean or listed, with category hints (spam, attacks, abuse)
- Per-list status across spam, attack, and bot/proxy reputation lists
- Readable listing reasons when a provider publishes return codes
- Permalink and Recheck for monitoring after delisting or infrastructure changes
How to use
Your IP is prefilled when possible. Enter any public IPv4 or IPv6 address and click Check blacklists. A clean result here is a useful signal, not a guarantee on every filter — listings may be temporary or disputed.
FAQ
How to check if an IP is blacklisted?
Enter an IPv4 or IPv6 address to query multiple DNS-based blocklists for spam and abuse listings, with an overall clean or listed verdict.
How to test email server IP reputation?
Check the sending IP before troubleshooting delivery failures—a listed IP explains bounces and spam-folder placement.
Why would an IP address be on a spam blacklist?
Outbound spam, compromised hosts, open relays, or attack traffic trigger listings—mail and security filters then reject connections from that IP.
What to do if my IP is blacklisted?
Fix the root cause (compromise, open relay, spam source), then follow each list's delisting process after traffic is clean.
Can a shared hosting IP be blacklisted?
Yes—another tenant's abuse can list the whole shared egress IP; the report helps confirm whether your address is flagged before you migrate or appeal.
How often should I recheck IP blacklist status?
After delisting or major infrastructure changes use Recheck for a fresh scan—cached results load instantly for repeat monitoring.
By using this tool you agree to our Terms of Use and Privacy Policy. Results are provided as-is without warranty.