asn.dev

Autonomous system

AS24357 CNGI-GZ-IX-AS-AP CERNET2 IX at South China University of Technology

Unclassified APNIC

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

Summary

CERNET2 IX at South China University of Technology

China · AI-generated

education ix cernet china

CNGI-GZ-IX-AS-AP is operated by CERNET (China Education and Research Network).

What it's used for

  • The address space carries educational and research traffic, evidenced by netnames CERNET-CN and BJR-CERNET and reverse DNS entries pointing to tsinghua.edu.cn.
  • The AS announces 65,792 IPv4 addresses across 10 prefixes and 1 IPv6 prefix, while maintaining only 3 observed neighbours, a ratio indicative of an access or exchange point network rather than a transit provider.

Notable

  • Registrants for all listed prefixes are consistent with the announcer, citing CERNET Helpdesk and China Education and Research Network (CERNET).
  • The inventory consists primarily of the 219.223.0.0/17 block and its subdivisions, alongside smaller allocations in 202.112.0.0/16.

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, 1 downstream and 3 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS4538China Education and Research Network Center66
AS23910China Next Generation Internet CERNET234

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, 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 1 prefixes

CountryNamePrefixes
CNChina9

Registry

Allocation record

APNIC · via Atlas (registry + RDAP)
Registry
APNIC
Handle
AS24357
Registry name
CNGI-GZ-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
0% valid · 0 valid, 14 with no ROA
ROAs
203 authorising AS24357
ASPA
no ASPA record
IRR
0% registered · 0 of 14 announcements 3 other origin
Route objects
0 naming AS24357

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 1,773 prefixes, as published 2026-10-13. 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