// ASN
AS51257
CERIZ, FR
Detailed information about the Autonomous System. Need another one? Look up a different ASN.
- ASN
- AS51257
- Description
- CERIZ, FR
- IPv4 Prefixes
- 1
- IPv6 Prefixes
- 2
IPv4 Prefixes
1 total171.22.146.0/24
IPv6 Prefixes
2 total2a05:d80:4000::/48 2a05:d80::/29
What is AS51257?
AS51257 is an Autonomous System Number (ASN) assigned to CERIZ, FR. An ASN identifies a network or group of IP prefixes operated under a common routing policy in the BGP protocol.
Looking for more ASN data?
Use our ASN Lookup Tool for real-time WHOIS queries, or explore our API documentation to integrate ASN data into your applications.