AS18097 — DCN D.C.N. Corporation

AS18097 announces 15 IPv4 prefixes covering 19,712 addresses and 1 IPv6 prefixes.

About this network

DCN is operated by D.C.N. Corporation.

What it's used for

• The address space carries residential and business access traffic, evidenced by reverse DNS entries such as pppoe254.149.east.tokyo.dcn.ne.jp and 0.180.189.210.k-isp.net.
• With 19,712 IPv4 addresses announced across 15 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 vary significantly; while some blocks are registered to the Japan Network Information Center (JPNIC) under netnames like kronos-CIDR-BLK-JP and DCN-CIDR-BLK-JP, others belong to specific entities such as Rakushasu Inc, freeasy inc., ACE QUALITY Co.,Ltd, and EIC INC.
• The inventory includes a mix of legacy JPNIC allocations and specific corporate registrations, suggesting a history of acquisitions or managed services for third-party organizations.
• The address inventory is fragmented across multiple /21 and /22 blocks in Japan, with a single /32 IPv6 prefix announced.

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

Announced prefixes

• 27.109.120.0/22
• 45.113.172.0/22
• 103.36.140.0/22
• 103.53.96.0/22
• 103.83.24.0/22
• 119.15.144.0/21
• 121.100.56.0/21
• 123.108.84.0/22
• 153.124.232.0/22
• 210.189.176.0/20
• 216.179.198.0/23
• 219.105.32.0/21
• 219.105.40.0/22
• 219.105.44.0/24
• 219.105.46.0/23
• 2402:c400::/32

Upstream networks

• AS7529 GMO NetIRD, Inc.
• AS2914 NTT America, Inc.

Adjacent networks

• AS7529 GMO NetIRD, Inc.
• AS2914 NTT America, Inc.