AS18092 — CSF Kyushu Tele Communications Company

AS18092 announces 13 IPv4 prefixes covering 45,056 addresses and 1 IPv6 prefixes.

About this network

The AS handle CSF is operated by CSF - Kyushu Tele Communications Company.

What it's used for

• The address space carries residential cable and DSL access, evidenced by reverse DNS names such as dhcp-ubr3-5509.csf.ne.jp and cableline-13048.tvs12.jp.
• The AS announces 45056 IPv4 addresses across 26 prefixes and 1 IPv6 prefix, with only 7 observed neighbours, indicating a regional access network rather than a transit provider.

Notable

• Registrants for the largest prefixes are listed as Japan Network Information Center, with netnames including CSF-NET-CIDR-BLK-JP, CABLELINE, and CSF-NET.
• The address inventory is finely subdivided into /20, /21, /22, /23, and /24 blocks, consistent with a corporate estate segmented by site or service type.

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

Announced prefixes

• 27.122.8.0/22
• 61.44.224.0/19
• 110.172.32.0/20
• 112.137.144.0/20
• 114.141.32.0/21
• 120.50.168.0/21
• 123.242.208.0/21
• 175.103.8.0/22
• 202.126.240.0/20
• 203.205.96.0/20
• 203.222.208.0/20
• 219.103.112.0/20
• 219.117.48.0/20
• 2404:1900::/32

Upstream networks

• AS2516 KDDI CORPORATION
• AS4713 NTT DOCOMO BUSINESS,Inc.
• AS6939 Hurricane Electric LLC
• AS17676 SoftBank Corp.
• AS35280 F5 Networks SARL

Downstream networks

• AS45677 Isahaya Cable Media Co.,Ltd

Adjacent networks

• AS2516 KDDI CORPORATION
• AS4713 NTT DOCOMO BUSINESS,Inc.
• AS6939 Hurricane Electric LLC
• AS45677 Isahaya Cable Media Co.,Ltd
• AS17676 SoftBank Corp.
• AS35280 F5 Networks SARL

Internet exchanges

• BroadBand Internet eXchange Osaka — Osaka, Japan
• JPIX Osaka — Osaka, Japan