asn.dev

Autonomous system

AS24348 CNGI-BJ-IX2-AS-AP CERNET2 IX at Tsinghua University

Unclassified APNIC

IPv4 addresses 16.38K 1 prefixes
IPv6 prefixes 30 counted as prefixes, not addresses
Countries 1 mostly CN
Exchanges 0 recorded by PCH
Upstreams 2 5 downstream
Flagged prefixes 0 none

Summary

CERNET2 IX at Tsinghua University

China · AI-generated

education ix china cernet

CNGI-BJ-IX2-AS-AP is the autonomous system for the CERNET2 Internet Exchange Point hosted at Tsinghua University.

What it's used for

  • The address space is registered to the China Education and Research Network (CERNET), with netnames including CIS-CERNET, CERNET-CN, and BJR-CERNET.
  • The AS announces 16,896 IPv4 addresses across 3 prefixes and 30 IPv6 prefixes, while maintaining only 7 observed neighbours, a ratio consistent with an internal educational network estate rather than a transit provider.

Notable

  • Registrants for all announced prefixes align with the announcer, listing CERNET Helpdesk, China Education and Research Network (CERNET), and IRT-CERNET-AP.
  • The inventory consists of a large /18 block alongside two /24 blocks, with the majority of the address space concentrated in the 58.206.192.0/18 range.

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

2 upstream, 5 downstream and 8 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS4538China Education and Research Network Center106
AS23910China Next Generation Internet CERNET260

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 · 16.38K addresses IPv6 30 prefixes

CountryNamePrefixes
CNChina31

Registry

Allocation record

APNIC · via Atlas (registry + RDAP)
Registry
APNIC
Handle
AS24348
Registry name
CNGI-BJ-IX2-AS-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
72% valid · 34 valid, 13 with no ROA
ROAs
44 authorising AS24348
ASPA
no ASPA record
IRR
0% registered · 0 of 47 announcements 1 other origin
Route objects
0 naming AS24348

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