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AS23855Singapore Advanced Research and Education Network

SingaporeRegistryAPNIC

As of 26th September 2026, AS23855 (Singapore Advanced Research and…), a network registered in Singapore with APNIC, originates 2 IPv4 prefixes covering 512 addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 48,547th-largest of the 79,480 networks we see originating IPv4, and the 281st-largest of 446 in Singapore. It is seen behind 19 upstream networks, most often AS293 (ESnet) and AS136968 (SingAREN), and in front of 19 downstream networks. Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

2

IPv6 prefixes

1

IPv4 addresses

512

IPv6 /64s

65.5k

Upstream graph

The networks AS23855 is seen behind, one and two hops out, drawn from real AS paths.

AS23855Toward the internet core
Upstream graph for AS23855: 11 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS23855Singapore Advance…This networkAS293ESnetAS4637Telstra Internati…AS6939Hurricane Electri…AS134148SingARENAS136968SingARENAS6453TATA Communicatio…AS16552Tiggee LLCAS32590Valve CorporationAS18106Viewqwest Pte LtdAS20130Depaul UniversityAS21320GEANT Vereniging

Networks observed one and two hops upstream of AS23855 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

101

adjacent networks

Upstreams
1919%
Peers
6362%
Downstreams
1919%

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

Upstreams of AS23855
NetworkCountryRelationshipPathsVantage pts
AS293ESnetUSPeer1,6501
AS136968SingARENSGPeer28649
AS4637Telstra International LimitedHKPeer21975
AS6939Hurricane Electric LLCUSPeer1384
AS134148SingARENSGPeer7963
AS23864Singapre Advance Research and Education Network - National Grid Office - IHPCSGPeer421
AS24490Trans-Eurasia Information Network (TEIN2) - SGCNPeer331
AS35280F5 Networks SARLFRPeer174
AS7660Asia Pacific Advanced Network - JapanJPPeer151
AS49544i3D.net B.VNLPeer132

Prefixes

The largest blocks AS23855 originates, widest first.

Largest prefixes originated by AS23855
PrefixAddressesVisibility
203.30.38.0/2425681/81
203.30.39.0/2425681/81
2001:df0:21a::/4865.5k × /6463/64

Routing health

How AS23855'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%3
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%3
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 2 prefixes

IPv6 — 1 prefixes

  • /4865.5k × /64100.0%1

Recent changes

Announcements that started or stopped since 27th Aug 2026.

No announcement by AS23855 started or stopped in this period.

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