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	Prefix	Description
	203.140.0.0/19	SCSK Corporation
	203.179.32.0/19	SCSK Corporation
	210.159.96.0/19	SCSK Corporation
	210.166.96.0/19	SCSK Corporation
	210.249.192.0/19	CSK-IT MANAGEMENT CORPORATION
	211.7.192.0/21	SCSK Corporation
	211.7.208.0/21	SCSK Corporation
	2400:af80::/32	Japan Network Information Center

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Network Policy

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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description	IPv4	IPv6
	AS17686	ACCELIA	✔	✔
	AS17676	SoftBank Corp.	✔	✔

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Peers

	ASN	Description	IPv4	IPv6
	AS17686	ACCELIA	✔	✔
	AS17676	SoftBank Corp.	✔	✔
	AS17680	SCSK Corporation	✔	✘
	AS6939	Hurricane Electric LLC	✔	✘
	AS150369	TelHi Corporation	✔	✔
	AS20473	The Constant Company, LLC	✔	✔
	AS8220	COLT	✔	✔
	AS9002	RETN Limited	✔	✔
	AS8966	Etisalat (ETC)	✔	✘
	AS2516	KDDI Corporation	✔	✘
	AS59105	Home NOC Operators Group	✔	✔
	AS2635	Automattic, Inc	✔	✔
	AS23764	China Telecom Global	✔	✘
	AS1828	Unitas Global	✔	✔
	AS138997	Eons Data Communications Limited	✔	✔
	AS9507	NextHop Pty Ltd	✔	✘
	AS63774	Kamoike.net LLP	✔	✔
	AS216211	CYBERVERSE LLC	✔	✔
	AS4651	The Communications Authority of Thailand (CAT)	✔	✘
	AS49544	i3D.net B.V	✔	✔
	AS2515	Japan Network Information Center	✔	✔
	AS2907	Science Information Network	✔	✔
	AS9886	CTCSCI TECH LIMITED	✔	✘
	AS8849	Melbikomas UAB	✔	✔
	AS45701	PT Internet Madju Abad Milenindo	✔	✘
	AS20485	TransTeleCom JSC	✔	✘
	AS58453	China Mobile International	✘	✔
	AS24482	SG.GS	✔	✔
	AS32590	Valve Corporation	✔	✔
	AS9299	PLDT (Philippine Long Distance Telephone Company)	✔	✘
	AS60068	Datacamp Limited (CDN77 / DataPacket)	✔	✘
	AS4809	China Telecom Next Generation Carrier Network	✔	✘
	AS18526	DDPS Networks, LLC	✔	✔
	AS36236	NetActuate, Inc	✔	✔
	AS15169	Google LLC	✔	✘
	AS153371	BACK WAVES LIMITED	✔	✘
	AS3786	LG DACOM Corporation	✔	✘
	AS150363	SoftEther Corporation	✘	✔
	AS20326	TeraSwitch Networks Inc.	✘	✔

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Downstreams

	ASN	Description	IPv4	IPv6
	AS17680	SCSK Corporation	✔	✘

[ JPNIC database provides information regarding IP address and ASN. Its use   ]
[ is restricted to network administration purposes. For further information,  ]
[ use 'whois -h whois.nic.ad.jp help'. To only display English output,        ]
[ add '/e' at the end of command, e.g. 'whois -h whois.nic.ad.jp xxx/e'.      ]

Autonomous System Information:
a. [AS Number]                  4693
b. [AS Name]                    CSK
g. [Organization]               CSK-IT MANAGEMENT CORPORATION
m. [Administrative Contact]     TH9886JP
n. [Technical Contact]          TH9886JP
q. [Abuse]                      
o. [IMPORT]                     
p. [EXPORT]                     
[Assigned Date]                 1996/03/08
[Last Update]                   2010/02/04 17:02:22(JST)

Last Update: 2025-07-26T22:58:21Z UTC / (Click here to force a refresh)

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Member of the following AS-SETs

-	Member
RADB	as-ocn-v6
RADB	as-kdddmpeer
JPIRR	as-ocn
JPIRR	as-accelia
RADB	as-nspixp2
RADB	as-accelia
RADB	as-telstra-intl-customers
RADB	as3491:as-customers-ap
RADB	as-ocn
JPIRR	as-ocn-v6
RADB	as-kdd
RADB	as-kddi6
JPIRR	as-iij6
ARIN	as1239:as-customers
JPIRR	as-iij
JPIRR	as-gigainfra
RADB	as-telstra-testing-1
LEVEL3	as-level3-origins-na
NTTCOM	as-infosphere-v6
NTTCOM	as-mhdd
JPIRR	as-gigainfra-v6
NTTCOM	as-ocn
RADB	as-telstra-intl-customers-4637
RADB	as-gigainfra-v6
NTTCOM	as-infosphere
JPIRR	as-infosphere
NTTCOM	as-ocn-v6
RADB	as-kddcustomer2
RADB	as-iij6
JPIRR	as-infosphere-v6
RADB	as-iij
RADB	as-ipv6_vectant
RADB	as-gigainfra
NTTCOM	as-ixp2
RADB	as-vectant
RADB	as-hurricanev6