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	Prefix	Description

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Network Policy

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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description	IPv4	IPv6

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Peers

	ASN	Description	IPv4	IPv6
	AS23910	China Next Generation Internet CERNET2	✘	✔

aut-num:        AS38587
as-name:        CERNET-IDC-AP
descr:          CERNET Internet Data Center
descr:          Tsinghua University
descr:          Beijing 100084, China
country:        CN
import:         from AS4538 action pref=10; accept ANY
import:         from AS9308 action pref=10; accept ANY
import:         from AS17772 action pref=10; accept ANY
export:         to AS4538 announce AS38587 AS9308 AS17772
export:         to AS9308 announce AS38587 AS4538
export:         to AS17772 announce AS38587 AS4538
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:  2020-09-03T09:16:05Z
source:         APNIC

Last Update: 2026-06-03T03:22:27Z UTC

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Member of the following AS-SETs

-	Member	ASN Count
RADB	as-anc-customer-proxy-register	2403
ARIN	as-xo-b	59498
RIPE	as20965:as-from-tein-to-geant	656
APNIC	as4538:as-customers	117
RADB	as-pacnet-customer-proxy-register	1171
APNIC	as23911:as-customers-v6	108
APNIC	as4538:as-customers-v6	111