asn.dev

Autonomous system

AS24490 TEIN2-SG-AP Trans-Eurasia Information Network TEIN2 - SG

Unclassified ARIN

IPv4 addresses 2.05K 1 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly CN
Exchanges 0 recorded by PCH
Upstreams 5 14 downstream
Flagged prefixes 0 none

Summary

Trans-Eurasia Information Network (TEIN2)

China · AI-generated

education research network china

The AS handle TEIN2-SG-AP is held by Trans-Eurasia Information Network (TEIN2).

What it's used for

  • The address space carries academic and research traffic, evidenced by the netname TEIN2-CERNET and registrant CERNET Helpdesk.
  • The AS announces 2048 IPv4 addresses across 1 prefix and 1 IPv6 prefix, while maintaining 17 observed neighbours. This ratio of limited address space against a moderate number of peers suggests a specialized research network rather than a large-scale commercial transit provider.

Notable

  • The registrant CERNET Helpdesk aligns with the announcer's identity, confirming the space is managed by the China Education and Research Network.
  • The address inventory consists of a single contiguous IPv4 block, 202.179.248.0/21, and one IPv6 prefix, 2001:254:8000::/33.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.

Interconnection

Peering at a glance

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

5 upstream, 14 downstream and 40 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS11537Internet23
AS23855Singapore Advanced Research and Education Network3
AS7575Australian Academic and Research Network (AARNet)1
AS20965GEANT Vereniging1
AS38229Lanka Education & Research Network, NREN1

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-10, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 1 prefixes · 2.05K addresses IPv6 1 prefixes

CountryNamePrefixes
CNChina2

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS24490
Registry name
TEIN2-SG-AP
Abuse contact
abuse@cernet.edu.cn
Registered
2008-09-04
Last changed
2020-09-03
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 2 with no ROA
ROAs
0 authorising AS24490
ASPA
no ASPA record
IRR
0% registered · 0 of 2 announcements
Route objects
0 naming AS24490

Reputation

Classification and threat

Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.

Spamhaus DROP

Not on ASN-DROP The network as a whole is not listed.

No DROP prefixes None of its announced space is on the DROP prefix list.

Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 431 networks and 1,775 prefixes, as published 2026-10-11. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.

FBI IC3

No IC3 indicators Nothing from the FBI IC3 feed.

IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.

Elsewhere

Cross-check