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	Prefix	Description
	163.138.0.0/17	Nippon Telegraph and Telephone Corporation
	163.138.128.0/19	Nippon Telegraph and Telephone Corporation
	192.5.216.0/24	Nippon Telegraph and Telephone Corporation
	192.26.94.0/24	Nippon Telegraph and Telephone Corporation
	192.47.167.0/24	Nippon Telegraph and Telephone Corporation

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Network Policy

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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description	IPv4	IPv6
	AS173	Nippon Telegraph and Telephone Corporation	✔	✘

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Peers

	ASN	Description	IPv4	IPv6
	AS173	Nippon Telegraph and Telephone 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]                  2511
b. [AS Name]                    CORE
g. [Organization]               Nippon Telegraph and Telephone Corporation
m. [Administrative Contact]     TM68535JP
n. [Technical Contact]          TM68535JP
q. [Abuse]                      
o. [IMPORT]                     
p. [EXPORT]                     
[Assigned Date]                 
[Last Update]                   2023/03/17 11:58:06(JST)

Last Update: 2025-07-09T23:57:45Z UTC / (Click here to force a refresh)

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Member of the following AS-SETs

-	Member	ASN Count
JPIRR	as-mesh-customer:as173	3
JPIRR	as-hanabi	7
RADB	as-mapos	3
ARIN	as1239:as-customers	4238
RADB	as-kdd	1155
JPIRR	as-iij	4735
RADB	as-ocn-v6	204
RADB	as-iij	4735
JPIRR	as-ocn	2
RADB	as-mfeed	9
NTTCOM	as-ocn-v6	204
JPIRR	as-mfeed	9
NTTCOM	as-ocn	2
JPIRR	as-ocn-v6	204
RADB	as-mesh-customer:as173	3
NTTCOM	as-hanabi	7
RADB	as-ocn	2
RADB	as-kddi6	833
RADB	as-kdddmpeer	192