subnet.im

AS24348CERNET2 IX at Tsinghua University

ChinaRegistryAPNIC

As of 26th September 2026, AS24348 (CERNET2 IX at Tsinghua University), a network registered in China with APNIC, originates 10 IPv4 prefixes covering 541k addresses and 38 IPv6 prefixes. By IPv4 address space that makes it the 680th-largest of the 79,516 networks we see originating IPv4, and the 54th-largest of 607 in China. It is seen behind 2 upstream networks, most often AS23910 (China Next Generation Internet CERNET2) and AS4538 (China Education and Research Network…), and in front of 5 downstream networks. 71% of its announcements have a valid RPKI ROA; 1 is RPKI-invalid. 2% of its routes reach at least 90% of full-feed peers, and 41 prefixes are also originated by another network.

At a glance

IPv4 prefixes

10

IPv6 prefixes

38

IPv4 addresses

541k

IPv6 /64s

17.2B

Upstream graph

The networks AS24348 is seen behind, one and two hops out, drawn from real AS paths.

AS24348Toward the internet core
Upstream graph for AS24348: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS24348CERNET2 IX at Tsi…This networkAS4538China Education a…AS23910China Next Genera…AS4837China Unicom Back…AS23764China Telecom Glo…AS4134China Telecom Bac…

Networks observed one and two hops upstream of AS24348 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

14

adjacent networks

Upstreams
214%
Peers
750%
Downstreams
536%

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

Upstreams of AS24348
NetworkCountryRelationshipPathsVantage pts
AS23910China Next Generation Internet CERNET2CNPeer67664
AS4538China Education and Research Network CenterCNPeer153135

Prefixes

All 48

The largest blocks AS24348 originates, widest first.

Largest prefixes originated by AS24348
PrefixAddressesVisibility
183.172.0.0/15131k2/81
58.207.0.0/1665.5k2/81
59.66.0.0/1665.5k2/81
101.5.0.0/1665.5k2/81
101.6.0.0/1665.5k2/81
183.172.0.0/1665.5k2/81
183.173.0.0/1665.5k2/81
58.206.192.0/1816.4k73/81
202.112.0.0/242562/81
202.112.61.0/242562/81

Routing health

How AS24348'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

  • Valid70.8%34
  • Invalid2.1%1
  • No ROA27.1%13

Propagation

  • Globally propagated90% of full-feed peers or more2.1%1
  • Partially propagated40% to 90%2.1%1
  • Seen by few peersUnder 40%95.8%46

Prefix sizes

IPv6 — 38 prefixes

  • /324.3B × /645.3%2
  • /332.1B × /645.3%2
  • /341.1B × /6410.5%4
  • /4865.5k × /6478.9%30

Recent changes

Announcements that started or stopped since 28th Aug 2026.

  • Announced2001:250:4::/4822nd Sept 2026
  • Announced202.112.0.0/2422nd Sept 2026
  • Withdrawn202.112.4.0/2421st Sept 2026
  • Withdrawn202.112.43.0/2421st Sept 2026
  • Withdrawn202.112.47.0/2421st Sept 2026
  • Withdrawn202.112.49.0/2421st Sept 2026
  • Withdrawn202.112.50.0/2421st Sept 2026
  • Withdrawn202.112.51.0/2421st Sept 2026
  • Withdrawn202.112.55.0/2421st Sept 2026
  • Withdrawn202.112.56.0/2421st Sept 2026
  • Withdrawn202.112.57.0/2421st Sept 2026
  • Withdrawn202.205.16.0/2021st Sept 2026

2 announced and 11 withdrawn in all; the most recent are shown.

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