Autonomous System
AS23855 · Singapore Advanced Research and Education Network
Overview
AS23855 is announced on the Internet: RIPE RIS route collectors currently see 2 IPv4 prefixes and 1 IPv6 prefix originated by this network. Together, its IPv4 prefixes cover 512 addresses, with overlapping prefixes counted once. In the paths the collectors record, it has 17 upstream neighbours (transit providers or peers) and 20 downstream neighbours (customers or networks it carries). Its most visible upstreams are Telstra Global (AS4637), SingAREN (AS136968), and SingAREN (AS134148). AS23855 was assigned by APNIC, and its registration country is Singapore.
Source: RIPEstat (RIPE NCC), RIS route collectors. Read on October 16, 2026 at 10:59 PM UTC. This page is refreshed at most every 12 hours.
Go further
The trace goes to 203.30.38.1, the first address of 203.30.38.0/24. An address picked inside a prefix may not answer (nothing listens there, or the network filters probes): the trace then shows the path up to the last network that replies.
Announced prefixes
IPv4 prefixes (2 prefixes)
| Prefix | Addresses |
|---|---|
| 203.30.38.0/24 | 256 |
| 203.30.39.0/24 | 256 |
IPv6 prefixes (1 prefix)
| Prefix |
|---|
| 2001:df0:21a::/48 |
Neighbours
Upstreams (transit or peers) (17)
| AS | Network | Visibility |
|---|---|---|
| AS4637 | Telstra Global | 636 |
| AS136968 | SingAREN | 521 |
| AS134148 | SingAREN | 238 |
| AS6939 | Hurricane Electric LLC | 222 |
| AS7660 | Asia Pacific Advanced Network - Japan | 107 |
| AS20965 | GEANT Vereniging | 34 |
| AS1103 | SURF B.V. | 18 |
| AS24490 | Trans-Eurasia Information Network (TEIN2) - SG | 14 |
| AS35280 | F5 Networks SARL | 12 |
| AS23864 | Singapre Advance Research and Education Network - National Grid Office - IHPC | 6 |
| AS2907 | Research Organization of Information and Systems, National Institute of Informatics | 2 |
| AS9304 | HGC Global Communications Limited | 2 |
| AS137409 | GSL Networks Pty LTD | 2 |
| AS7575 | Australian Academic and Research Network (AARNet) | 1 |
| AS9264 | - | 1 |
| AS20326 | TeraSwitch Networks Inc. | 1 |
| AS64049 | Reliance Jio Infocomm Pte Ltd Singapore | 1 |
Downstreams (customers) (20)
| AS | Network | Visibility |
|---|---|---|
| AS132398 | Science and Engineering Institutes | 477 |
| AS7660 | Asia Pacific Advanced Network - Japan | 312 |
| AS23864 | Singapre Advance Research and Education Network - National Grid Office - IHPC | 301 |
| AS9419 | Nanyang Technological University | 217 |
| AS134148 | SingAREN | 144 |
| AS23767 | A-STAR | 118 |
| AS293 | ESnet | 67 |
| AS24490 | Trans-Eurasia Information Network (TEIN2) - SG | 67 |
| AS131475 | Singapore Institute of Technology | 33 |
| AS9885 | NKN INTERNET GATEWAY NETWORK | 29 |
| AS137207 | - | 22 |
| AS9270 | - | 8 |
| AS206350 | Oman Research and education Network (OMREN) | 6 |
| AS45259 | - | 5 |
| AS7497 | - | 3 |
| AS9264 | - | 3 |
| AS38229 | Lanka Education & Research Network, NREN | 3 |
| AS50999 | - | 2 |
| AS4538 | China Education and Research Network Center | 1 |
| AS9821 | Department of Science and Technology | 1 |
16 more neighbours appear on both sides of this network depending on the path, so they are counted in neither list.
Visibility is RIPEstat's count of how often the route collectors observed the link. It compares neighbours with each other; it is not a traffic volume.
How to read this page
An Autonomous System (AS) is a network run under one routing policy: an internet provider, a cloud, a content network, a university. Each one has a number, its ASN, assigned by a regional registry (ARIN, RIPE NCC, APNIC, LACNIC, AFRINIC), and uses BGP, the protocol networks use to tell each other where addresses are, to announce the blocks of addresses it delivers to.
A prefix such as 203.0.113.0/24 is a block of addresses: the number after the slash says how many bits are fixed, so a /24 holds 256 IPv4 addresses and a /16 holds 65,536. Networks often announce a large block and smaller pieces of it at the same time, which is why the address total counts each address once.
Neighbours come from the paths themselves. A network that appears just before this one in a path, on the collector's side, is an upstream: a transit provider or a peer. One that appears just after it is a downstream, usually a customer. Peering at an internet exchange also shows up as an upstream, so the upstream list is not a list of paid transit.
The data comes from RIPEstat, run by the RIPE NCC, which gathers the routing tables of hundreds of networks through its RIS route collectors. This page reads it when it is visited and keeps it for 12 hours at most; the BGP viewer reads it live.