AS18136 JCOM Co., Ltd.

CTA - JCOM Co., Ltd. · registered in Japan

IPv4 addresses43,0086 prefixes · 0.001% of announced IPv4

Rank in Japan#188largest network in JP by IPv4 space, of 724 · 0.03% of JP

Rank worldwide#4,174of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryJapan745 ASNs registered there

Open AS18136 in ASN lookup Look up an IP in this network (27.126.64.1) All networks in Japan

IPv4 prefixes

All 6 prefixes, in address order.

27.126.64.0/18
27.126.128.0/20
117.53.0.0/19
117.53.32.0/21
219.105.80.0/20
219.105.96.0/19

Other ASNs named JCOM Co., Ltd.

10 other networks use the same organisation name; together with AS18136 they announce 6,733,824 IPv4 addresses.

ASNNameIPv4 addresses

AS9824JTCL-JP-AS - JCOM Co., Ltd. JP4,745,216

AS9617ZAQ - JCOM Co., Ltd. JP1,163,264

AS4721JCN - JCOM Co., Ltd. JP631,808

AS9378CABLENET - JCOM Co., Ltd. JP45,056

AS18134KITANET - JCOM Co., Ltd. JP29,696

AS23788HICT - JCOM Co., Ltd. JP24,576

AS24276ICNET - JCOM Co., Ltd. JP20,480

AS23790KCN-TV - JCOM Co., Ltd. JP18,432

AS7686ATNETHOME - JCOM Co., Ltd. JP8,192

AS45675KMN-TOKYO - JCOM Co., Ltd. JP4,096

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS18092#185 CSF - Kyushu Tele Communications Company45,056

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

AS23785#187 SUNFIELD - SUN FIELD INTERNET LIMITED45,056

AS59125#189 CYBERHOME1 - FAMILY NET JAPAN INCORPORATED41,984

AS2511#190 CORE - Nippon Telegraph and Telephone Corporation41,728

AS7676#191 TAM - TAM Co., Ltd.39,680

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