SharkDNS Live Query
ECS Test
Query a domain with EDNS Client Subnet options from different regions and compare GeoDNS answers.
No test yet
Enter a domain to see how resolvers answer for client subnets in different regions. Leave subnet empty to probe six regions.
How This Query Works
EDNS Client Subnet lets recursive resolvers forward part of the client IP so authoritative servers can return location-aware answers.
Each probe sends the same A query with a different client subnet to ECS-aware resolvers.
The echoed scope shows how much of your subnet the authoritative server used for its decision.
Different answers per region confirm GeoDNS or CDN steering is active for the domain.
ECSEDNSGeoDNSCDN
Related Guides
Short articles explaining when and why to use this query.
EDNS Client Subnet explained
5 min readHow ECS lets resolvers share client location hints, why GeoDNS depends on it, and how to test it.
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.