subnet.im

AS24239TWD2 Education and Research Network

ChinaRegistryAPNIC

As of 26th September 2026, AS24239 (TWD2 Education and Research Network), a network registered in China with APNIC, originates 12 IPv6 prefixes. It is seen behind 3 upstream networks, most often AS4842 (Tianhai InfoTech) and AS209300 (Wende Tan), and in front of 2 downstream networks. Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 92% of its routes reach at least 90% of full-feed peers, and 1 prefix is also originated by another network.

At a glance

IPv4 prefixes

0

IPv6 prefixes

12

IPv4 addresses

0

IPv6 /64s

2.8M

Upstream graph

The networks AS24239 is seen behind, one and two hops out, drawn from real AS paths.

AS24239Toward the internet core
Upstream graph for AS24239: 7 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS24239TWD2 Education an…This networkAS4842Tianhai InfoTechAS6939Hurricane Electri…AS209300Wende TanAS18106Viewqwest Pte LtdAS20130Depaul UniversityAS20473The Constant Comp…AS212683Olilo UK & Irelan…

Networks observed one and two hops upstream of AS24239 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

10

adjacent networks

Upstreams
330%
Peers
550%
Downstreams
220%

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

Upstreams of AS24239
NetworkCountryRelationshipPathsVantage pts
AS4842Tianhai InfoTechCNPeer52964
AS209300Wende TanCNPeer21864
AS6939Hurricane Electric LLCUSPeer16463

Prefixes

The largest blocks AS24239 originates, widest first.

Largest prefixes originated by AS24239
PrefixAddressesVisibility
2404:f4c0:f000::/441M × /6426/64
2a0e:aa06:490::/441M × /6464/64
2a0c:b641:571::/4865.5k × /6464/64
2a0e:aa06:490::/4865.5k × /6463/64
2a0e:aa06:491::/4865.5k × /6463/64
2a0e:aa06:492::/4865.5k × /6463/64
2a0e:aa06:493::/4865.5k × /6463/64
2a0e:aa06:494::/4865.5k × /6463/64
2a0e:aa06:495::/4865.5k × /6463/64
2a0e:aa06:496::/4865.5k × /6463/64

Routing health

How AS24239'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

  • Valid100.0%12
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more91.7%11
  • Partially propagated40% to 90%8.3%1
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv6 — 12 prefixes

  • /441M × /6416.7%2
  • /4865.5k × /6483.3%10

Recent changes

Announcements that started or stopped since 27th Aug 2026.

No announcement by AS24239 started or stopped in this period.

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