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	Prefix	Description
	2001:250::/32
	2001:251::/32	CERNET IPv6CJ
	2001:da8::/32	China Next Generation Internet CERNET2
	240c:c000::/20	China Education and Research Network

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Network Policy

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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description	IPv4	IPv6
	AS23911	China Next Generation Internet Beijing IX	✘	✔

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Peers

	ASN	Description	IPv4	IPv6
	AS23911	China Next Generation Internet Beijing IX	✘	✔
	AS4538	China Education and Research Network Center	✘	✔
	AS133111	CERNET New Technology Co., Ltd	✘	✔
	AS24363	CERNET2 IX at Shandong University	✘	✔
	AS4134	China Telecom Backbone	✘	✔
	AS133512	CERNET New Technology Co., Ltd	✘	✔
	AS24360	CERNET2 IX at Zhengzhou University	✘	✔
	AS24357	CERNET2 IX at South China University of Technology	✘	✔
	AS24348	CERNET2 IX at Tsinghua University	✘	✔
	AS24367	CERNET2 IX at Zhejiang University	✘	✔
	AS24358	CERNET2 IX at Huazhong University of Science and Technology	✘	✔
	AS24355	CERNET2 IX at University of Electronic Science and Te...	✘	✔
	AS24362	CERNET2 IX at University of Science and Technology of China	✘	✔
	AS24353	CERNET2 IX at Xi'an Jiaotong University	✘	✔
	AS24350	CERNET2 IX at Beijing University of Posts and Telecom...	✘	✔
	AS24361	CERNET2 IX at Southeast University	✘	✔
	AS24359	CERNET2 IX at Central South University	✘	✔
	AS24356	CERNET2 IX at Chongqing University	✘	✔
	AS24372	CERNET2 IX at Harbin Institute of Technology	✘	✔
	AS138378	CERNET2 regional IX at Yunnan University	✘	✔
	AS138370	CERNET2 regional IX at Nanchang University	✘	✔
	AS138381	CERNET2 regional IX at Guizhou University	✘	✔
	AS138182	CERNET2 regional IX at Hebei Normal University	✘	✔
	AS24364	CERNET2 IX at Shanghai Jiaotong University	✘	✔
	AS133513	CERNET New Technology Co., Ltd	✘	✔
	AS138369	CERNET2 regional IX at Shenzhen University	✘	✔
	AS138393	CERNET2 regional IX at Guangxi University	✘	✔
	AS24369	CERNET2 IX at Northeast University	✘	✔
	AS24349	CERNET2 IX at Peking University	✘	✔
	AS24371	CERNET2 IX at Jilin University	✘	✔
	AS24352	CERNET2 IX at Tianjin University	✘	✔
	AS138371	CERNET2 regional IX at Ocean University of China	✘	✔
	AS24368	CERNET2 IX at Xiamen University	✘	✔
	AS138373	CERNET2 regional IX at Fuzhou University	✘	✔
	AS138374	CERNET2 regional IX at Taiyuan University	✘	✔
	AS24354	CERNET2 IX at Lanzhou University	✘	✔
	AS138375	CERNET2 regional IX at Inner Mongolia University	✘	✔
	AS138438	CERNET2 regional IX at Guangxi Normal University	✘	✔
	AS138376	CERNET2 regional IX at Ningxia University	✘	✔
	AS138377	CERNET2 regional IX at Qinghai Normal University	✘	✔
	AS138440	CERNET2 regional IX at Hainan Normal University	✘	✔
	AS24370	CERNET2 IX at Dalian University of Technology	✘	✔
	AS138442	CERNET2 regional IX at Tibet University	✘	✔
	AS24351	CERNET2 IX at Beijing University of Aeronautics and A...	✘	✔
	AS24365	CERNET2 IX at Fudan University	✘	✔
	AS38587	CERNET Internet Data Center	✘	✔
	AS24366	CERNET2 IX at Tongji University	✘	✔
	AS133518	CERNET New Technology Co., Ltd	✘	✔
	AS133517	CERNET New Technology Co., Ltd	✘	✔

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Downstreams

	ASN	Description	IPv4	IPv6
	AS133111	CERNET New Technology Co., Ltd	✘	✔
	AS24363	CERNET2 IX at Shandong University	✘	✔
	AS133512	CERNET New Technology Co., Ltd	✘	✔
	AS24348	CERNET2 IX at Tsinghua University	✘	✔
	AS24350	CERNET2 IX at Beijing University of Posts and Telecom...	✘	✔
	AS133513	CERNET New Technology Co., Ltd	✘	✔
	AS24364	CERNET2 IX at Shanghai Jiaotong University	✘	✔
	AS4538	China Education and Research Network Center	✘	✔
	AS24357	CERNET2 IX at South China University of Technology	✘	✔
	AS24367	CERNET2 IX at Zhejiang University	✘	✔
	AS24372	CERNET2 IX at Harbin Institute of Technology	✘	✔
	AS24369	CERNET2 IX at Northeast University	✘	✔
	AS24349	CERNET2 IX at Peking University	✘	✔
	AS24352	CERNET2 IX at Tianjin University	✘	✔
	AS24360	CERNET2 IX at Zhengzhou University	✘	✔
	AS138369	CERNET2 regional IX at Shenzhen University	✘	✔
	AS24371	CERNET2 IX at Jilin University	✘	✔
	AS138371	CERNET2 regional IX at Ocean University of China	✘	✔
	AS24362	CERNET2 IX at University of Science and Technology of China	✘	✔

aut-num:        AS23910
as-name:        CNGI-CERNET2-AS-AP
descr:          China Next Generation Internet CERNET2
descr:          CNGI-CERNET
descr:          Beijing 100084, China
country:        CN
import:         from AS4538 action pref=10; accept ANY
import:         from AS4839 action pref=10; accept ANY
import:         from AS4840 action pref=10; accept ANY
import:         from AS9406 action pref=10; accept ANY
import:         from AS9407 action pref=10; accept ANY
export:         to AS9406 announce AS23910 AS4538 AS9407 AS4839 AS4840
export:         to AS4538 announce AS23910 AS9406 AS9407 AS4839 AS4840
export:         to AS9407 announce AS23910 AS4538 AS9406 AS4839 AS4840
export:         to AS4840 announce AS23910 AS4538 AS9406 AS9407 AS4839
export:         to AS4839 announce AS23910 AS4538 AS9406 AS9407 AS4840
default:        to AS4538 action pref=10; networks ANY
remarks:        Multihome portion of CERNET
admin-c:        CER-AP
tech-c:         CER-AP
abuse-c:        AC1685-AP
mnt-lower:      MAINT-CERNET-AP
mnt-routes:     MAINT-CERNET-AP
mnt-by:         APNIC-HM
mnt-irt:        IRT-CERNET-AP
last-modified:  2020-09-03T09:16:14Z
source:         APNIC

Last Update: 2025-12-26T03:22:23Z UTC

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Member of the following AS-SETs

-	Member	ASN Count
RIPE	as20965:as-from-tein-to-geant	654
APNIC	as4538:as-customers	116
RADB	as-pacnet-customer-proxy-register	1171
LEVEL3	as-level3-origins-na	0
RADB	as-hurricanev6	20161
ARIN	as-xo-b	58188
APNIC	as4538:as-customers-v6	110
APNIC	as23911:as-customers-v6	108
ARIN	as293:as-from-singaren-to-esnet	4548
RADB	as-anc-customer-proxy-register	2403
RADB	as-twig	2235