AS18097 — DCN - D.C.N. Corporation

AS18097 announces 10 IPv4 prefixes covering 10,496 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
• 103.36.140.0/22
• 103.83.24.0/22
• 119.15.144.0/21
• 123.108.84.0/22
• 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.

Routing security

• RPKI: 0 valid, 0 invalid and 20 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 35% of announcements registered; 11 route objects.
• Listed in as-sets: AS-ANC, AS-FLAGP, AS-FLAGT, AS-IIJ, AS-IIJ6, AS-KDDCUSTOMER2, AS-NETIRD, AS-OCN, AS-OCN, AS-PACNET, AS-PACNET-CUSTOMER-PROXY-REGISTER, AS-TELSTRA-INTL-CUSTOMERS, AS-XO-B, AS2497:AS-IIJ, AS2497:AS-IIJ6, AS2914:AS-64600-V6, AS2914:AS-ASIA, AS2914:AS-ASIA-V6.