AS18266 — ATNAP Datacore Works Co.,Ltd.

AS18266 announces 7 IPv4 prefixes covering 6,144 addresses and 1 IPv6 prefixes.

About this network

ATNAP is the handle for Cable Networks Akita Co.,ltd., a regional cable operator in Japan.

What it's used for

• The address space carries residential and business access traffic, evidenced by reverse DNS entries such as fa210-143-115-255.feba.jp and c210-143-117-254.feba.jp, where feba.jp and cna.ne.jp are domains associated with the operator's customer-facing infrastructure.
• With 6144 IPv4 addresses announced across 7 prefixes and only 2 observed neighbours, the high address-to-neighbour ratio indicates an access or eyeball network rather than a transit provider.

Notable

• Registrants for all announced prefixes are listed as Japan Network Information Center, which is consistent with the standard allocation process for Japanese ISPs and does not indicate a mismatch with the announcer.
• The inventory consists of a mix of /21, /22, and /23 blocks, primarily in the 210.143.0.0/16 and 203.179.0.0/16 ranges, along with a single /32 IPv6 prefix.

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

Announced prefixes

• 203.179.240.0/22
• 203.179.246.0/23
• 203.179.250.0/23
• 210.143.112.0/21
• 210.143.120.0/23
• 210.143.124.0/22
• 219.124.96.0/23
• 2001:e58::/32

Upstream networks

• AS23783 Cable Networks Akita Co.,ltd.

Downstream networks

• AS59111 Akita International University

Adjacent networks

• AS23783 Cable Networks Akita Co.,ltd.
• AS59111 Akita International University

Internet exchanges

• JPIX Tokyo — Tokyo, Japan