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AS numbers

AS4538 CERNET-CN

AS4538 is operated by CERNET-CN and registered with APNIC (CN) since 2002-08-01.

It announces 3,502 IPv4 and 9 IPv6 prefixes, 27% of them RPKI valid.

RIPE RIS sees 25 upstream and peer networks and 23 downstream networks next to it.

PeeringDB lists it as an Educational/Research network. Its peering policy is open.

Run the full network report BGP lookup WHOIS PeeringDB lookup
NameCERNET-CN
Registry handleERX-CERNET-BKB
Registry (RIR)APNIC
CountryChina (CN)
Delegated on2002-08-01
Network typeEducational/Research, Not Disclosed
Peering policyOpen
Prefixes (IPv4 / IPv6)3,502 / 9
RPKI valid27% (954 / 3,511)
Upstreams and peers25
Downstream networks23
Websiteedu.cn

Routing health

  • AS4538 announces 3502 IPv4 and 9 IPv6 prefixes.
  • 954 of 3511 announced prefixes are RPKI valid.
  • 2557 announced prefixes are not covered by a ROA of AS4538 (they may have none, or another network’s).
  • 25 upstreams and peers, 23 downstream networks seen.

For every check with the fix (IRR route objects, the RPKI state of each route, reverse DNS and the registration), run the full network report.

Announced prefixes 3,511

  • 1.51.0.0/16
  • 1.51.3.0/24
  • 1.51.112.0/24
  • 1.51.120.0/21
  • 1.51.192.0/18
  • 1.184.0.0/15
  • 42.244.0.0/16
  • 42.244.0.0/18
  • 42.245.0.0/16
  • 42.246.0.0/15
  • 42.247.8.0/24
  • 42.247.9.0/24
  • 42.247.13.0/24
  • 42.247.18.0/24
  • 42.247.20.0/24
  • 42.247.30.0/24
  • 42.247.53.0/24
  • 42.247.58.0/24
  • 42.247.103.0/24
  • 42.247.107.0/24
  • 42.247.113.0/24
  • 49.52.0.0/14
  • 49.52.0.0/15
  • 49.52.48.0/24
  • 49.120.0.0/14
  • 49.120.64.0/19
  • 49.122.0.0/20
  • 49.122.16.0/21
  • 49.122.24.0/21
  • 49.122.32.0/20
  • 49.122.64.0/22
  • 49.122.128.0/18
  • 49.122.191.0/24
  • 49.123.0.0/20
  • 49.123.16.0/21
  • 49.123.64.0/18
  • 49.140.0.0/15
  • 49.140.0.0/16
  • 49.141.0.0/20
  • 49.141.16.0/21
  • 49.141.24.0/21
  • 49.141.32.0/20
  • 49.141.64.0/18
  • 49.141.128.0/20
  • 49.141.144.0/21
  • 49.141.192.0/20
  • 49.141.210.0/24
  • 49.208.0.0/15
  • 49.208.0.0/17
  • 49.209.0.0/20
  • 49.209.16.0/20
  • 49.209.32.0/19
  • 49.209.64.0/18
  • 49.209.232.0/21
  • 49.209.240.0/20
  • 58.154.0.0/15
  • 58.154.0.0/20
  • 58.154.32.0/23
  • 58.154.34.0/24
  • 58.154.37.0/24
  • 58.154.48.0/20
  • 58.154.96.0/20
  • 58.154.128.0/20
  • 58.154.144.0/20
  • 58.154.160.0/19
  • 58.154.192.0/19
  • 58.154.224.0/20
  • 58.154.240.0/20
  • 58.155.0.0/16
  • 58.155.0.0/20
  • 58.155.16.0/21
  • 58.155.24.0/21
  • 58.155.32.0/20
  • 58.155.48.0/20
  • 58.155.50.0/24
  • 58.155.51.0/24
  • 58.155.53.0/24
  • 58.155.62.0/24
  • 58.155.63.0/24
  • 58.155.71.0/24
  • 58.155.96.0/20
  • 58.155.124.0/22
  • 58.155.128.0/23
  • 58.155.130.0/23
  • 58.155.132.0/23
  • 58.155.134.0/23
  • 58.155.136.0/23
  • 58.155.144.0/22
  • 58.155.156.0/22
  • 58.155.160.0/21
  • 58.155.168.0/22
  • 58.155.172.0/22
  • 58.155.176.0/20
  • 58.155.192.0/20
  • 58.155.208.0/20
  • 58.155.224.0/20
  • 58.155.240.0/20
  • 58.192.0.0/12
  • 58.192.0.0/15
  • 58.194.8.0/23

Showing the first 100.

Upstreams and peers 25

The networks RIPE RIS sees next to AS4538 in BGP paths, the most visible first.

Peering

Peering policy: Open. Suggested max-prefix limits: 0 IPv4, 0 IPv6. PeeringDB record

More about AS4538

Sources: RIR delegation data and PeeringDB (updated daily); routing from RIPEstat (RIPE NCC RIS and RPKI), refreshed daily. Routing data from 2026-11-15 09:12 UTC. The country is where the AS number was registered, not necessarily where the network operates.