AS10010 — TOKAI - TOKAI Communications Corporation

Network type: residential

AS10010 announces 112 IPv4 prefixes covering 1,497,088 addresses and 4 IPv6 prefixes.

About this network

TOKAI is TOKAI Communications Corporation, the telecom subsidiary of TOKAI Holdings, headquartered in Shizuoka City. It is the ISP behind the nationwide @T COM brand and the Shizuoka-local TNC (TOKAI Network Club) brand, and it grew out of a cable-TV business, which is still part of the group.

What it's used for

Consumer and small-business broadband. The AS announces 187 IPv4 prefixes totalling roughly 1,503,000 addresses and 7 IPv6 prefixes — a very large pool of access space, mostly in /16s and /17s. Every sampled address lands in a subscriber pool: 5.net042126000.t-com.ne.jp and p005.net182020128.tnc.ne.jp bake the customer's IPv4 address into the hostname, which is what CPE naming looks like at scale, and both zones are the operator's own retail brands.

Notable

An eyeball network, and one of the larger regional ones in Japan. The decisive evidence is the ratio: 1.5 million addresses against only 63 observed BGP neighbours. A wholesale carrier holding that much space would peer with hundreds to thousands of ASes; a retail ISP buys transit from a few upstreams and peers at a couple of exchanges. Geolocate this space to Japanese households, concentrated in Shizuoka and the wider Tokai region but present nationally through @T COM.

Interesting

The sample also turns up sbtmwan-128.5.dws.ne.jp and i2059133.icntv.ne.jp — other operators' zones inside TOKAI's announced space. TOKAI sells wholesale connectivity and CATV-ISP services to smaller cable companies, so some of these addresses front third-party retail brands rather than @T COM directly.

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

Announced prefixes

• 27.98.0.0/17
• 27.98.128.0/18
• 27.121.0.0/18
• 42.124.0.0/16
• 42.125.0.0/17
• 42.125.128.0/18
• 42.125.192.0/19
• 42.125.225.0/24
• 42.125.226.0/23
• 42.125.228.0/22
• 42.125.232.0/21
• 42.125.240.0/21
• 42.125.248.0/23
• 42.125.251.0/24
• 42.125.252.0/22
• 42.126.0.0/15
• 43.224.28.0/24
• 45.90.85.0/24
• 45.90.86.0/23
• 45.120.79.0/24
• 45.251.132.0/22
• 59.84.0.0/15
• 59.86.0.0/17
• 59.86.128.0/19
• 61.120.224.0/19
• 61.198.96.0/19
• 61.200.96.0/19
• 61.206.64.0/20
• 61.211.176.0/20
• 61.211.192.0/19
• 91.200.58.0/24
• 94.74.184.0/23
• 103.4.68.0/22
• 103.26.34.0/24
• 103.37.10.0/23
• 103.41.60.0/24
• 103.41.240.0/22
• 103.51.80.0/22
• 103.97.208.0/24
• 103.136.196.0/22
• 103.217.136.0/23
• 103.239.92.0/22
• 103.239.216.0/22
• 110.172.56.0/21
• 111.67.112.0/20
• 112.137.192.0/18
• 112.138.0.0/15
• 112.140.0.0/19
• 116.68.217.0/24
• 116.68.218.0/23
• 116.68.220.0/22
• 116.254.0.0/18
• 116.254.64.0/19
• 117.104.0.0/18
• 118.151.192.0/20
• 119.83.0.0/16
• 120.136.192.0/18
• 120.137.128.0/17
• 124.47.192.0/18
• 133.186.0.0/20
• 133.186.32.0/20
• 133.186.48.0/22
• 133.225.214.0/24
• 150.38.0.0/16
• 150.96.0.0/24
• 158.201.125.0/24
• 164.162.0.0/22
• 164.162.8.0/21
• 164.162.17.0/24
• 164.162.18.0/23
• 164.162.20.0/22
• 164.162.24.0/21
• 164.162.32.0/19
• 164.162.64.0/18
• 164.162.128.0/17
• 180.149.204.0/22
• 180.233.96.0/20
• 182.20.0.0/15
• 183.86.0.0/17
• 183.86.128.0/18
• 183.182.160.0/24
• 183.182.162.0/24
• 193.151.111.0/24
• 194.87.225.0/24
• 202.136.192.0/20
• 202.208.192.0/19
• 202.216.27.0/24
• 202.216.76.0/23
• 202.216.79.0/24
• 202.222.0.0/22
• 202.222.4.0/23
• 202.226.16.0/22
• 203.95.32.0/19
• 203.114.228.0/22
• 203.171.212.0/22
• 210.4.240.0/20
• 210.146.96.0/19
• 210.155.240.0/20
• 210.158.224.0/19
• 210.171.240.0/20

and 16 more.

Upstream networks

• AS174 Cogent Communications, LLC
• AS6939 Hurricane Electric LLC
• AS1299 Arelion Sweden AB
• AS4637 Telstra Global
• AS17676 SoftBank Corp.
• AS2518 BIGLOBE Inc.
• AS2497 Internet Initiative Japan Inc.
• AS24482 SG.GS
• AS20485 Joint Stock Company TransTeleCom
• AS17639 Converge ICT Solutions Inc.
• AS132132 MyRepublic Ltd.
• AS9002 RETN Limited

Downstream networks

• AS23791 LCV Corporation
• AS131939 IPS INC
• AS131915 Hamamatsu Cable Television .Inc
• AS17953 BroadBand Security, Inc.
• AS9351 ZTV CO.,LTD
• AS146969 SoftBank Corp.
• AS23795 Fitec Corp.
• AS4678 Canon IT Solutions Inc.
• AS17678 Gunma Internet Co,.ltd
• AS23785 SUN FIELD INTERNET LIMITED
• AS23836 RELATION Co., Ltd.
• AS63805 Ryobi Systems Co., Ltd.
• AS23639 NTT Bizlink, Inc.
• AS55385 Digital Alliance Co.,Ltd.
• AS7690 Mirai Communication Network Inc.
• AS131946 MUSASHINO UNIVERSITY E.F.
• AS133780 Quantum Mesh Co.,Ltd.
• AS23642 OBIS
• AS17683 Wingtechnology Communications, Inc.
• AS131934 ICC Corporation
• AS24257 Japan Internet Xing Co., Ltd.
• AS38642 Yoshizou XYZ Solutions
• AS63779 InfiniCloud Co. Ltd.
• AS9990 Nippon Information and Communication Corporation
• AS131940 Nissho Electronics Corp.

Adjacent networks

• AS174 Cogent Communications, LLC
• AS4637 Telstra Global
• AS1299 Arelion Sweden AB
• AS6939 Hurricane Electric LLC
• AS2497 Internet Initiative Japan Inc.
• AS17676 SoftBank Corp.
• AS2518 BIGLOBE Inc.
• AS59103 SoftEther Corporation
• AS23642 OBIS
• AS132132 MyRepublic Ltd.
• AS23791 LCV Corporation
• AS9351 ZTV CO.,LTD
• AS131939 IPS INC
• AS131915 Hamamatsu Cable Television .Inc
• AS17953 BroadBand Security, Inc.
• AS24482 SG.GS
• AS20485 Joint Stock Company TransTeleCom
• AS17639 Converge ICT Solutions Inc.
• AS146969 SoftBank Corp.
• AS23795 Fitec Corp.
• AS17683 Wingtechnology Communications, Inc.
• AS4678 Canon IT Solutions Inc.
• AS17678 Gunma Internet Co,.ltd
• AS23785 SUN FIELD INTERNET LIMITED
• AS23836 RELATION Co., Ltd.

Routing security

• RPKI: 155 valid, 2 invalid and 38 not-found announcements; 149 ROAs.
• ASPA: none published.
• IRR: 98% of announcements registered; 224 route objects.
• Listed in as-sets: AS-139076, AS-139076, AS-17697ARCSTAR, AS-ANC, AS-BBX-PEERS, AS-CTGJP-TOKAI, AS-CTGNET-CUT, AS-GIGAINFRA, AS-GIGAINFRA-V6, AS-HURRICANEV6, AS-IIJ, AS-IIJ6, AS-INFOSPHERE, AS-INFOSPHERE-V6, AS-KDD, AS-KDDI6, AS-MESH-CUSTOMER:AS10010, AS-OCN, AS-OCN, AS-OCN-V6, AS-OCN-V6, AS-PACNET, AS-PACNET-CUSTOMER-PROXY-REGISTER, AS-TELSTRA-INTL-CUSTOMERS, AS-TELSTRA-INTL-CUSTOMERS-4637.

Internet exchanges

• BroadBand Internet eXchange Tokyo — Tokyo, Japan
• JPIX Tokyo — Tokyo, Japan
• BroadBand Internet eXchange Osaka — Osaka, Japan
• Equinix Internet Exchange Tokyo — Tokyo, Japan
• JPIX Osaka — Osaka, Japan