asn.dev

Autonomous system

AS24352 CNGI-TJN-IX-AS-AP CERNET2 IX at Tianjin University

Unclassified APNIC

IPv4 addresses 8.19K 4 prefixes
IPv6 prefixes 1 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 Tianjin University

China · AI-generated

education ix cernet china

CNGI-TJN-IX-AS-AP is operated by CERNET2 IX at Tianjin University.

What it's used for

  • The address space carries China Education and Research Network (CERNET) traffic, with all four IPv4 prefixes registered under the netname BJR-CERNET and registrant China Education and Research Network (CERNET).
  • The AS announces 8192 IPv4 addresses across 4 prefixes and 24 IPv6 prefixes, while maintaining only 2 observed neighbours, a ratio consistent with an access or exchange point role within the academic network rather than a transit provider.

Notable

  • Registrants for all announced IPv4 prefixes align with the announcer, listing China Education and Research Network (CERNET) and CERNET Helpdesk as the responsible parties.
  • The inventory consists of four distinct IPv4 blocks in the 202.113.0.0/16 range and a set of IPv6 prefixes under 2001:250::/32 and 2001:da8::/32, reflecting the dual-stack infrastructure of the Chinese academic backbone.

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 CERNET289
AS4538China Education and Research Network Center6

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-18, 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 4 prefixes · 8.19K addresses IPv6 1 prefixes

CountryNamePrefixes
CNChina5

Registry

Allocation record

APNIC · via Atlas (registry + RDAP)
Registry
APNIC
Handle
AS24352
Registry name
CNGI-TJN-IX-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
94% valid · 51 valid, 3 with no ROA
ROAs
51 authorising AS24352
ASPA
no ASPA record
IRR
2% registered · 1 of 54 announcements
Route objects
1 naming AS24352

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: 442 networks and 1,784 prefixes, as published 2026-10-19. 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