Autonomous system
AS10010 TOKAI TOKAI Communications Corporation
Residential APNIC
Summary
TOKAI Communications Corporation
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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 5 exchanges in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| BroadBand Internet eXchange Tokyo | Tokyo, Japan | 101.203.88.50 |
| JPIX Tokyo | Tokyo, Japan | 210.171.224.124 |
| BroadBand Internet eXchange Osaka | Osaka, Japan | 218.100.9.71 |
| Equinix Internet Exchange Tokyo | Tokyo, Japan | 203.190.230.13 |
| JPIX Osaka | Osaka, Japan | 103.246.232.124 |
Transit providers
12 upstream, 37 downstream and 76 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 194 prefixes · 1.50M addresses IPv6 4 prefixes
| Country | Name | Prefixes |
|---|---|---|
| JP | Japan | 198 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS10010- Registry name
- TOKAI
- Registered
- 2000-04-27
- Last changed
- 2012-09-24
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 81% valid · 156 valid, 36 with no ROA 1 RPKI-invalid
- ROAs
- 150 authorising AS10010
- ASPA
- no ASPA record
- IRR
- 98% registered · 190 of 193 announcements
- Route objects
- 226 naming AS10010
Reputation
Classification and threat
Residential Fixed-line consumer ISP. Addresses here are homes.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 431 networks and 1,768 prefixes, as published 2026-10-12. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere