SharkDNS Live Query
Blacklist
Check an IPv4 address against public DNS blocklists (RBL/DNSBL).
No check yet
Enter an IPv4 address to check public DNS blocklists.
How This Query Works
Blacklist checks query DNS-based blocklists using the reversed IP address, the same method mail servers use.
Each zone is queried in parallel and a positive A record means the IP is listed.
TXT records returned by the zone usually explain the listing reason.
A listing does not always mean abuse; some zones list dynamic or unassigned ranges by policy.
RBLDNSBLSpamhausReputation
Related Guides
Short articles explaining when and why to use this query.
IP blacklist check explained
4 min readUnderstand DNS-based blocklists, why an IP gets listed, and how to read listing reasons.
What is DNS lookup used for?
4 min readUse DNS lookup to inspect records, verify routing, troubleshoot mail, and compare public DNS visibility.
Reverse IP lookup explained
3 min readFind domains observed on the same IPv4 address and understand shared hosting or infrastructure relationships.