subnet.im

AS24357CERNET2 IX at South China University of Technology

ChinaRegistryAPNIC

As of 26th September 2026, AS24357 (CERNET2 IX at South China University of…), a network registered in China with APNIC, originates 13 IPv4 prefixes covering 852k addresses and 201 IPv6 prefixes. By IPv4 address space that makes it the 516th-largest of the 79,516 networks we see originating IPv4, and the 42nd-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 1 downstream network. 93% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. Under 1% of its routes reach at least 90% of full-feed peers, and 13 prefixes are also originated by another network.

At a glance

IPv4 prefixes

13

IPv6 prefixes

201

IPv4 addresses

852k

IPv6 /64s

17.2B

Upstream graph

The networks AS24357 is seen behind, one and two hops out, drawn from real AS paths.

AS24357Toward the internet core
Upstream graph for AS24357: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS24357CERNET2 IX at Sou…This networkAS4538China Education a…AS23910China Next Genera…AS4837China Unicom Back…AS23764China Telecom Glo…AS4134China Telecom Bac…

Networks observed one and two hops upstream of AS24357 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

6

adjacent networks

Upstreams
233%
Peers
350%
Downstreams
117%

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

Upstreams of AS24357
NetworkCountryRelationshipPathsVantage pts
AS23910China Next Generation Internet CERNET2CNPeer69964
AS4538China Education and Research Network CenterCNPeer262

Prefixes

All 214

The largest blocks AS24357 originates, widest first.

Largest prefixes originated by AS24357
PrefixAddressesVisibility
125.216.0.0/1665.5k2/81
125.217.0.0/1665.5k2/81
125.218.0.0/1665.5k2/81
202.116.0.0/1665.5k2/81
211.66.0.0/1665.5k2/81
219.222.0.0/1665.5k2/81
219.223.0.0/1665.5k2/81
222.16.0.0/1665.5k2/81
222.17.0.0/1665.5k2/81
222.200.0.0/1665.5k2/81

Routing health

How AS24357'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

  • Valid93.5%200
  • Invalid0.0%0
  • No ROA6.5%14

Propagation

  • Globally propagated90% of full-feed peers or more0.5%1
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%99.5%213

Prefix sizes

IPv4 — 13 prefixes

IPv6 — 201 prefixes

  • /324.3B × /642.0%4
  • /4865.5k × /6498.0%197

Recent changes

Announcements that started or stopped since 28th Aug 2026.

  • Withdrawn202.112.17.0/2421st Sept 2026
  • Withdrawn202.112.18.0/2421st Sept 2026
  • Withdrawn202.112.19.0/2421st Sept 2026

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