// ASN
AS203991
AS20473, CN
Detailed information about the Autonomous System. Need another one? Look up a different ASN.
- ASN
- AS203991
- Organization
- Free IPv6 Sponsor Program
- Description
- AS20473, CN
- Country
- CN
- Registry (RIR)
- RIPE
- Created
- 2026-01-13
- Updated
- 2026-01-26
- IPv4 Prefixes
- 0
- IPv6 Prefixes
- 0
What is AS203991?
AS203991 is an Autonomous System Number (ASN) assigned to Free IPv6 Sponsor Program. 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.