Autonomous Systems are networks typically governed by large ISPs that participate in global Internet routing. Each network is assigned a unique identification number known as the AS number or ASN by the Internet Assigned Numbers Authority.

ASN	143721
Name	AS143721-48 - China Education and Research Network (CERNET)
Country	China
Registry	APNIC

IPv4 addresses	0
IPv6 /64 networks	0
Prefixes	0