asn.dev

Autonomous system

AS7686 ATNETHOME JCOM Co., Ltd.

Residential APNIC

IPv4 addresses 8.19K 2 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly JP
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

JCOM Co., Ltd.

Japan · AI-generated

isp residential eyeball cable legacy

ATNETHOME is held by JCOM Co., Ltd. (J:COM), Japan's largest cable-television operator. The handle preserves @NetHome, the cable-broadband ISP brand that J:COM's predecessor group ran before absorbing it.

What it's used for

  • Two prefixes, 61.211.144.0/20 and 210.228.0.0/20 — about 8,200 addresses. No IPv6 is announced on this AS.
  • Reverse DNS is straightforward cable-subscriber addressing: allNNNNNNNNN.allnet.ne.jp, sequentially numbered per address. allnet.ne.jp was the ISP domain of Titus Communications, a cable operator later folded into the Jupiter Telecom group that became J:COM.
  • This is a legacy pocket of J:COM's subscriber space rather than the company's main network. J:COM's bulk cable-broadband customers are numbered on other, much larger ASNs.

Notable

  • Residential space, and it should geolocate to Japanese households, not to a corporate address.
  • JPNIC records the 61.211.144.0/20 allocation to 2001, under the ATNETHOME netname, and it still routes today — the brand is gone, the block is not.

Interesting

  • @NetHome was launched in 1999 as a joint venture between Jupiter Telecom, Sumitomo Corporation and the American @Home Network, whose cable-modem model it imported. @Home Network went bankrupt in 2001; the Japanese venture survived, was later rebranded ZAQ, and was eventually merged away entirely — leaving this AS handle as one of the few places its name still appears.

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

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS9824JCOM Co., Ltd.120

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-28, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 2 prefixes · 8.19K addresses IPv6 0 prefixes

CountryNamePrefixes
JPJapan2

Registry

Allocation record

APNIC · via Atlas (registry + RDAP)
Registry
APNIC
Handle
AS7686
Registry name
ATNETHOME
Registered
1997-11-13
Last changed
2022-02-18
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 2 valid, 0 with no ROA
ROAs
2 authorising AS7686
ASPA
no ASPA record
IRR
100% registered · 2 of 2 announcements
Route objects
2 naming AS7686

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: 448 networks and 1,849 prefixes, as published 2026-10-29. 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

Cross-check