AS4693 CSK-IT MANAGEMENT CORPORATION

CSK - CSK-IT MANAGEMENT CORPORATION · registered in Japan

IPv4 addresses45,0567 prefixes · 0.001% of announced IPv4

Rank in Japan#183largest network in JP by IPv4 space, of 724 · 0.03% of JP

Rank worldwide#4,099of 79,396 networks with IPv4

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

CountryJapan745 ASNs registered there

Open AS4693 in ASN lookup Look up an IP in this network (203.140.0.1) All networks in Japan

IPv4 prefixes

All 7 prefixes, in address order.

203.140.0.0/19
203.179.32.0/19
210.159.96.0/19
210.166.96.0/19
210.249.192.0/19
211.7.192.0/21
211.7.208.0/21

IPv6 prefixes

All 1 prefix.

2400:af80::/32

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS10019#180 MCTV - Matsusaka Cable-TV Station Inc.47,104

AS18278#181 CC9N - Cable TV Corporation47,104

AS18282#182 CORALNET - Tonami System Solutions Co., Ltd.46,336

AS10003#184 OCT-NET - Ogaki Cable Television Co.,Inc.45,056

AS18092#185 CSF - Kyushu Tele Communications Company45,056

AS9378#186 CABLENET - JCOM Co., Ltd.45,056

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