AS2523 Internet Technology Research Consortium

ITRC-NET - Internet Technology Research Consortium · registered in Japan

IPv4 addresses61,94418 prefixes · 0.002% of announced IPv4

Rank in Japan#166largest network in JP by IPv4 space, of 724 · 0.04% of JP

Rank worldwide#3,605of 79,396 networks with IPv4

IPv61 x /32 (65,536 x /48)1 prefixes

CountryJapan745 ASNs registered there

Open AS2523 in ASN lookup Look up an IP in this network (133.69.0.1) All networks in Japan

IPv4 prefixes

All 18 prefixes, in address order.

133.69.0.0/17
133.69.128.0/19
133.69.164.0/23
133.69.166.0/24
133.69.167.0/25
133.69.167.128/26
133.69.167.192/27
133.69.167.224/28
133.69.167.240/29
133.69.177.0/24
133.69.178.0/23
133.69.180.0/22
133.69.185.0/24
133.69.186.0/23
133.69.188.0/22
133.69.192.0/20
133.69.208.0/20
133.69.224.0/19

IPv6 prefixes

All 1 prefix.

2407:e0c0::/32

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS9366#163 SOLITON - SOLITON-NET63,744

AS17686#164 ACCELIA - ACCELIA63,488

AS59127#165 NCV - Newmedia Corporation63,488

AS131918#167 SCN-NET - SHONAN CABLE NETWORK61,440

AS55374#168 FJcloud-East - FUJITSU LIMITED57,088

AS4711#169 INTEC - INTEC Inc.54,272

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources