Reverse DNS PTR Resolver
Reverse DNS Lookup
Perform a quick Reverse DNS PTR lookup to determine the official system hostname and ISP carrier mapped to any IP address.
Reverse DNS Resolution Details
Target IP Address
137.138.6.72
Network Provider (ISP / ASN)
AS513 (CERN - CERN - European Organization for Nuclear Research, CH) [CH]
Remote Server Geolocation & Time
Country
Switzerland
Switzerland
Region & City
Geneva, Geneva
Postal Code
1240
Coordinates (Lat / Lon)
46.2052, 6.142
Timezone Mapped
Europe/Zurich
Server Local Time
08:58:31 - 19.06.2026
Allocated RIR Network
RIPE NCC (Europe, Middle East, Central Asia)
Autonomous Owner
CERN-LAN1
Live Security Reputation Check
100% Clean Reputation
No spam, botnet attacks, or national threat flags identified for this host.
Spamhaus Zen RBL:
CLEAN
Barracuda Central:
CLEAN
USOM Threat Center:
CLEAN