AS23790 — KCN-TV - JCOM Co., Ltd.

AS23790 announces 2 IPv4 prefixes covering 18,432 addresses and 0 IPv6 prefixes.

About this network

KCN-TV is the AS handle for JCOM Co., Ltd., a major Japanese cable television and broadband internet service provider.

What it's used for

• The address space carries residential broadband traffic, evidenced by reverse DNS entries such as gd202157047254.b3r.kcn-tv.ne.jp and gd119161117254.u6u.kcn-tv.ne.jp, which follow JCOM's standard naming convention for customer premises equipment.
• The AS announces 18,432 IPv4 addresses across 2 prefixes and maintains only 1 observed neighbour, a ratio that indicates an access or eyeball network rather than a transit provider.

Notable

• The RDAP registrants for both announced prefixes are listed as Japan Network Information Center (JPNIC), which is the regional internet registry for Japan, rather than the operator directly.
• The address inventory consists of one large /18 block (202.157.0.0/18) and one smaller /21 block (119.161.112.0/21), both registered under the netname JCN-CIDR-BLK-JP.
• The AS has been observed in routing tables since 2004, indicating a long-standing presence in the Japanese internet infrastructure.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 119.161.112.0/21
• 202.157.0.0/18

Upstream networks

• AS9824 JCOM Co., Ltd.

Adjacent networks

• AS9824 JCOM Co., Ltd.

Routing security

• RPKI: 2 valid, 0 invalid and 0 not-found announcements; 2 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 3 route objects.
• Listed in as-sets: AS-9824TRANSIT, AS-9824TRANSIT6, AS-ANC, AS-GIGAINFRA, AS-GIGAINFRA-V6, AS-IIJ, AS-IIJ6, AS-IPV6_VECTANT, AS-KDD, AS-KDDI6, AS-KORNETBGP, AS-MESH-CUSTOMER:AS7679, AS-OCN, AS-OCN, AS-OCN-V6, AS-OCN-V6, AS-PACNET, AS-VECTANT, AS2497:AS-IIJ, AS2497:AS-IIJ6.