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	Prefix	Description
	130.158.0.0/16	University of Tsukuba
	133.51.0.0/16	University of Tsukuba
	163.220.252.0/22	University of Tsukuba

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Network Policy

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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description	IPv4	IPv6
	AS2907	Science Information Network	✔	✘
	AS63770	Industrial Cyber Security Center of Excellence	✔	✘

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Peers

	ASN	Description	IPv4	IPv6
	AS2907	Science Information Network	✔	✘
	AS63770	Industrial Cyber Security Center of Excellence	✔	✘

[ 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]                  37917
b. [AS Name]                    UTINS
g. [Organization]               University of Tsukuba
m. [Administrative Contact]     KI7984JP
n. [Technical Contact]          AM1479JP
n. [Technical Contact]          KK6630JP
n. [Technical Contact]          AS3586JP
q. [Abuse]                      
o. [IMPORT]                     from AS2907 100 accept ANY
o. [IMPORT]                     from AS18127 100 accept ANY
p. [EXPORT]                     to AS2907 announce AS37917
p. [EXPORT]                     to AS18127 announce AS37917
[Assigned Date]                 2007/06/08
[Last Update]                   2007/06/11 13:01:44(JST)

Last Update: 2025-07-10T00:03:11Z UTC / (Click here to force a refresh)

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Member of the following AS-SETs

-	Member	ASN Count
ARIN	as1239:as-customers	4238
JPIRR	as-63788	22
RADB	as-iij	4729
JPIRR	as-18127	22
JPIRR	as-iij6	4101
RADB	as-maffin-peer	5
JPIRR	as-iij	4729
JPIRR	as-36599	22
LEVEL3	as-level3-origins-na	0
JPIRR	as-63781	22
JPIRR	as-63770	22
JPIRR	as2907:as-sinet	150
RIPE	as20965:as-from-tein-to-geant	654
JPIRR	as-59120	22
JPIRR	as-59103	24
RADB	as-iij6	4101
JPIRR	as-as151388	22