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	Prefix	Description
	123.255.64.0/21	Information Technology Services Centre
	137.189.196.0/24	The Chinese University of Hong Kong
	175.159.224.0/22	The Chinese University of Hong Kong
	202.40.216.0/24	CUHK Library
	203.188.64.0/20	The Chinese University of Hong Kong
	103.49.160.0/22	The Chinese University of Hong Kong
	137.189.0.0/16	The Chinese University of Hong Kong
	2001:ce0:3::/48	Joint Universities Computer Centre Limited
	2405:3000::/32	The Chinese University of Hong Kong

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Network Policy

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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description	IPv4	IPv6
	AS3662	Joint Universities Computer Centre Limited	✔	✔
	AS6939	Hurricane Electric LLC	✘	✔
	AS4641	The Hong Kong Internet Exchange Limited	✘	✔

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Peers

	ASN	Description	IPv4	IPv6
	AS3662	Joint Universities Computer Centre Limited	✔	✔
	AS6939	Hurricane Electric LLC	✔	✔
	AS137207	Joint Universities Computer Centre Limited	✔	✔
	AS4641	The Hong Kong Internet Exchange Limited	✘	✔
	AS4635	HKIX Route Servers	✔	✔
	AS9886	CTCSCI TECH LIMITED	✔	✔
	AS8359	MTS PJSC	✔	✘
	AS49544	i3D.net B.V	✔	✔
	AS140627	OneQode	✔	✘
	AS7713	PT Telkom Indonesia Tbk	✔	✘
	AS24482	SG.GS	✔	✔
	AS38008	Aperture Science Limited	✔	✔
	AS36236	NetActuate, Inc	✔	✔
	AS132337	Axclusive	✔	✘
	AS39120	Convergenze S.p.A.	✔	✘
	AS15169	Google LLC	✔	✘
	AS45474	Nexusguard Pte. Ltd.	✔	✘

aut-num:        AS3661
as-name:        ERX-CUHKNET
descr:          The Chinese University of Hong Kong
descr:          Information Technology Services Centre
country:        HK
remarks:        This aut-num object created as part of the ER-Transfer from ARIN
org:            ORG-CUOH1-AP
admin-c:        NA17-AP
tech-c:         NT27-AP
abuse-c:        AC2019-AP
mnt-by:         APNIC-HM
mnt-lower:      MAINT-CUHKNET-HK
mnt-routes:     MAINT-CUHKNET-HK
mnt-irt:        IRT-CUHKNET-HK
last-modified:  2022-12-05T02:41:49Z
source:         APNIC


organisation:   ORG-CUOH1-AP
org-name:       The Chinese University of Hong Kong
org-type:       LIR
country:        HK
address:        ********
address:        ********
phone:          ********
fax-no:         ********
# Email removed, Log into bgp.tools to see whois emails
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2023-09-05T02:14:42Z
source:         APNIC

Last Update: 2026-03-13T03:22:26Z UTC

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Member of the following AS-SETs

-	Member
RADB	as3491:as-customers-ap
RADB	as-twig
RADB	as-hkix
RADB	as9269:as-hkbn-transit
RADB	as137207:as-harnet-re
LEVEL3	as-sprint-origins
RADB	as58453:as-asiaascust
RADB	as-telstra-intl-customers-4637
RADB	as-kddi6
APNIC	as-hktcustomer
LEVEL3	as-level3-asia
RADB	as-hkt-as4515
ARIN	as293:as-from-singaren-to-esnet
RADB	as-nexusguard-clients
APNIC	as58453:as-asiaascust
APNIC	as58453:as-asiatest
APNIC	as3662:as-harnet
NTTCOM	as-4641ntt
APNIC	as137207:as-harnet-re
RADB	as-kdd
RADB	as-ctbc-tools
RADB	as-cti-telecom
LEVEL3	as-level3-origins-na
RADB	as-hurricanev6
ALTDB	as-hwng-downstreams
RADB	as-pacnet-customer-proxy-register
RIPE	as20965:as-from-tein-to-geant
RADB	as-hkt-netvigator
RIPE	as3303:as-swcmpeers
NTTCOM	as2914:as-64603-v6
RADB	as-hkbn-transit
APNIC	as4641:as-cuhk-transit
ARIN	as293:as-from-transpac-to-esnet
RADB	as-anc-customer-proxy-register
NTTCOM	as9269:as-hkbn-transit
ARIN	as-xo-b
RADB	as-btn-customers