asn.dev

Autonomous system

AS24349 CNGI-BJ-IX3-AS-AP CERNET2 IX at Peking University

Unclassified ARIN

IPv4 addresses 65.28K 8 prefixes
IPv6 prefixes 36 counted as prefixes, not addresses
Countries 1 mostly CN
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

CERNET2 IX at Peking University

China · AI-generated

ix education research china

CNGI-BJ-IX3-AS-AP is operated by CERNET2 IX at Peking University.

What it's used for

  • The address space carries academic and research infrastructure, evidenced by the netnames PKU-CN and BJR-CERNET and the reverse DNS record grid02.phy.pku.edu.cn.
  • The AS announces 288 IPv4 addresses and 36 IPv6 prefixes while maintaining only 2 observed neighbours, a ratio consistent with a specialized exchange or internal research network rather than a general transit provider.

Notable

  • Registrants for the announced prefixes are China Education and Research Network (CERNET) and CERNET Helpdesk, which aligns with the announcer's identity as a CERNET2 facility.
  • The inventory consists of two IPv4 prefixes, 162.105.126.0/24 and 202.38.140.0/27, alongside a set of ten IPv6 /48 blocks within the 2001:250::/32 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, 0 downstream and 2 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS23910China Next Generation Internet CERNET2100
AS4538China Education and Research Network Center22

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-11, 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 8 prefixes · 65.28K addresses IPv6 36 prefixes

CountryNamePrefixes
CNChina44

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS24349
Registry name
CNGI-BJ-IX3-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
91% valid · 61 valid, 6 with no ROA
ROAs
65 authorising AS24349
ASPA
no ASPA record
IRR
1% registered · 1 of 67 announcements
Route objects
1 naming AS24349

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 1,768 prefixes, as published 2026-10-12. 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