AS7497 — CSTNET-AS-AP Computer Network Information Center of Chinese Academy of Sciences CNIC-CAS

Network type: education

AS7497 announces 24 IPv4 prefixes covering 867,840 addresses and 3 IPv6 prefixes.

About this network

CSTNET-AS-AP is CSTNET, the China Science and Technology Network, run by the Computer Network Information Center of the Chinese Academy of Sciences (CNIC-CAS). It is one of China's national research and education networks.

What it's used for

• Connecting the institutes of the Chinese Academy of Sciences, national research institutes, scientific data centres and a large share of China's national research infrastructure. It is an academic, non-profit network, not a commercial ISP.
• Carrying research traffic internationally: CSTNET maintains open exchange points in China and the United States and links to peer research networks in Europe and the Asia-Pacific.

Notable

• By far the largest network in its numeric neighbourhood — roughly 860,000 IPv4 addresses across several hundred prefixes, plus a substantial IPv6 footprint. Every prefix checked registers back to CSTNET-CN under CNIC-CAS, so the space really is all one institution's.
• The classic block is 159.226.0.0/16, the Chinese Academy of Sciences' Class B, alongside ranges in 124.16/15, 210.72, 210.77 and 202.127.
• Its footprint is institutional rather than residential: universities, institutes and data centres, not subscriber pools.

Interesting

• CSTNET is generally credited as the birthplace of the Internet in China — the Chinese Academy of Sciences ran the country's first full TCP/IP connection to the global Internet. The network still carries the research community it was built for.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 49.210.0.0/15
• 60.245.128.0/17
• 101.252.0.0/15
• 103.2.208.0/22
• 113.130.96.0/20
• 113.130.112.0/21
• 119.78.0.0/15
• 124.16.0.0/15
• 159.226.0.0/16
• 202.38.128.0/23
• 202.122.32.0/21
• 202.127.0.0/21
• 202.127.16.0/20
• 202.127.144.0/20
• 202.127.200.0/21
• 203.83.56.0/21
• 210.72.0.0/17
• 210.72.128.0/19
• 210.73.0.0/18
• 210.75.224.0/19
• 210.76.192.0/19
• 210.77.0.0/19
• 210.77.64.0/19
• 223.192.0.0/15
• 2001:cc0::/32
• 2400:dd00::/28
• 2401:de00::/32

Upstream networks

• AS174 Cogent Communications, LLC
• AS3491 PCCW Global (HK) Ltd.
• AS6939 Hurricane Electric LLC
• AS11537 Internet2
• AS4635 Hong Kong Internet Exchange--Route Server 1
• AS4134 No.31,Jin-rong Street
• AS23855 Singapore Advanced Research and Education Network
• AS293 ESnet
• AS1103 SURF B.V.
• AS7660 Asia Pacific Advanced Network - Japan
• AS24482 SG.GS
• AS7575 Australian Academic and Research Network (AARNet)

Downstream networks

• AS24151 China Internet Network Infomation Center
• AS38345 Internet Domain Name System Beijing Engineering Resrarch Center Ltd.
• AS63555 Beijing Beilong Yunhai Network Data Technology Corporation
• AS4538 China Education and Research Network Center
• AS24409 China Internet Network Infomation Center

Adjacent networks

• AS174 Cogent Communications, LLC
• AS3491 PCCW Global (HK) Ltd.
• AS6939 Hurricane Electric LLC
• AS24151 China Internet Network Infomation Center
• AS11537 Internet2
• AS38345 Internet Domain Name System Beijing Engineering Resrarch Center Ltd.
• AS4635 Hong Kong Internet Exchange--Route Server 1
• AS4134 No.31,Jin-rong Street
• AS63555 Beijing Beilong Yunhai Network Data Technology Corporation
• AS23855 Singapore Advanced Research and Education Network
• AS7660 Asia Pacific Advanced Network - Japan
• AS293 ESnet
• AS1103 SURF B.V.
• AS24482 SG.GS
• AS20965 GEANT Vereniging
• AS4538 China Education and Research Network Center
• AS24409 China Internet Network Infomation Center
• AS23911 China Next Generation Internet Beijing IX
• AS7575 Australian Academic and Research Network (AARNet)
• AS9808 China Mobile Communications Group Co., Ltd.

Internet exchanges

• Hong Kong Internet Exchange — Hong Kong, China