AS23780 — CTB CTB Media Inc.

AS23780 announces 5 IPv4 prefixes covering 16,384 addresses and 1 IPv6 prefixes.

About this network

CTB is the AS handle for CTB Media Inc., a Japanese cable and DSL internet service provider.

What it's used for

• The address space carries residential access traffic, evidenced by reverse DNS entries such as dhcp24-254.ctb.ne.jp and gw00-00-000.ctb.ne.jp across multiple prefixes.
• The AS announces 16,384 IPv4 addresses and 1 IPv6 prefix, with 22 observed routing neighbours, indicating a role as an access network rather than a transit provider.

Notable

• All registrants for the announced prefixes are listed as Japan Network Information Center (JPNIC), which is consistent with the holder being a Japanese ISP.
• The address inventory consists of five IPv4 prefixes and one IPv6 prefix, all located in Japan, with netnames CTB-CIDR-BLK-JP and CTB reflecting the operator's identity.

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

Announced prefixes

• 49.128.24.0/21
• 49.128.96.0/22
• 203.201.52.0/22
• 211.15.112.0/20
• 211.19.224.0/19
• 2402:6c80::/32

Upstream networks

• AS2497 Internet Initiative Japan Inc.
• AS2519 ARTERIA Networks Corporation
• AS6939 Hurricane Electric LLC
• AS17676 SoftBank Corp.
• AS17639 Converge ICT Solutions Inc.
• AS24482 SG.GS
• AS20485 Joint Stock Company TransTeleCom
• AS8966 EMIRATES TELECOMMUNICATIONS GROUP COMPANY (ETISALAT GROUP) PJSC

Adjacent networks

• AS2497 Internet Initiative Japan Inc.
• AS2519 ARTERIA Networks Corporation
• AS6939 Hurricane Electric LLC
• AS17676 SoftBank Corp.
• AS24482 SG.GS
• AS17639 Converge ICT Solutions Inc.
• AS20485 Joint Stock Company TransTeleCom
• AS8966 EMIRATES TELECOMMUNICATIONS GROUP COMPANY (ETISALAT GROUP) PJSC

Internet exchanges

• BroadBand Internet eXchange Tokyo — Tokyo, Japan
• JPIX Tokyo — Tokyo, Japan
• BroadBand Internet eXchange Singapore — Singapore, Singapore
• BroadBand Internet eXchange Osaka — Osaka, Japan
• BroadBand Internet eXchange Hong Kong — Hong Kong, China