subnet.im

AS4538China Education and Research Network Center

ChinaRegistryAPNICTypeEyeball

As of 16th October 2026, AS4538 (China Education and Research Network…), an access network registered in China with APNIC, originates 5,143 IPv4 prefixes covering 42.9M addresses and 5,021 IPv6 prefixes. By IPv4 address space that makes it the 15th-largest of the 79,621 networks we see originating IPv4, and the 4th-largest of 594 in China. It is seen behind 20 upstream networks, most often AS23764 (China Telecom Global) and AS4837 (China Unicom Backbone), and in front of 22 downstream networks. 63% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 8% of its routes reach at least 90% of full-feed peers, and 4,768 prefixes are also originated by another network.

At a glance

IPv4 prefixes

5,143

IPv6 prefixes

5,021

IPv4 addresses

42.9M

IPv6 /64s

17.9T

Upstream graph

The networks AS4538 is seen behind, one and two hops out, drawn from real AS paths.

AS4538Toward the internet core
Upstream graph for AS4538: 11 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS4538China Education a…This networkAS174Cogent Communicat…AS4134China Telecom Bac…AS4837China Unicom Back…AS6453TATA Communicatio…AS23764China Telecom Glo…AS151326DCConnect Communi…AS1299Arelion (fka. Tel…AS3356Lumen (Level 3)AS8220COLTAS35280F5 Networks SARLAS7713PT Telkom Indones…

Networks observed one and two hops upstream of AS4538 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

95

adjacent networks

Upstreams
2021%
Peers
5356%
Downstreams
2223%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS4538
NetworkCountryRelationshipPathsVantage pts
AS23764China Telecom GlobalHKPeer49,35081
AS4837China Unicom BackboneCNPeer33,3548
AS4134China Telecom BackboneCNPeer26,96619
AS174Cogent Communications, LLCUSPeer5,443140
AS6453TATA Communications (America) IncUSPeer5,077146
AS6939Hurricane Electric LLCUSPeer3,102145
AS4635HKIX Route ServersHKPeer2,52916
AS58453China Mobile InternationalHKPeer1,974146
AS2914NTT America, Inc.USPeer1,465146
AS1299Arelion (fka. Telia Carrier)SEPeer1,427146

Prefixes

All 10,164

The largest blocks AS4538 originates, widest first.

Largest prefixes originated by AS4538
PrefixAddressesVisibility
58.192.0.0/121M80/81
59.64.0.0/121M80/81
202.192.0.0/121M80/81
210.32.0.0/121M80/81
222.16.0.0/121M80/81
222.192.0.0/121M80/81
58.200.0.0/13524k79/81
125.216.0.0/13524k80/81
202.112.0.0/13524k80/81
202.192.0.0/13524k18/81

Routing health

How AS4538's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid63.1%6,415
  • Invalid0.0%0
  • No ROA36.9%3,749

Propagation

  • Globally propagated90% of full-feed peers or more8.4%852
  • Partially propagated40% to 90%<0.1%1
  • Seen by few peersUnder 40%91.6%9,311

Prefix sizes

IPv4 — 5,143 prefixes

IPv6 — 5,021 prefixes

  • /324.3B × /6483.1%4,172
  • /332.1B × /64<0.1%3
  • /341.1B × /64<0.1%4
  • /36268M × /64<0.1%4
  • /4016.8M × /64<0.1%2
  • /4865.5k × /6416.7%836

Recent changes

Announcements that started or stopped since 16th Sept 2026.

35 announced and 62 withdrawn in all; the most recent are shown.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.