Autonomous system
AS10012 FUSION Rakuten Mobile, Inc.
Unclassified APNIC
Summary
Rakuten Mobile (Fusion Communications)
FUSION is registered to Rakuten Mobile, Inc., but the handle and the reverse DNS both point at its origin: Fusion Communications Corporation, the fixed-line and IP-telephony carrier that pioneered Japan's 050 VoIP numbers. Rakuten bought Fusion in 2007, rebranded it Rakuten Communications, and folded it into Rakuten Mobile in 2019. The AS came along with the corporate furniture.
What it's used for
Legacy carrier and corporate-services infrastructure. The AS announces 4 IPv4 prefixes totalling 20,480 addresses and one IPv6 /32 — a small, static estate. The only sampled PTR is ae-1-0.bb1.otemachi.fcc.ad.jp: an aggregated-Ethernet interface on a backbone router in Otemachi, Tokyo's carrier-hotel district, still living under Fusion's original fcc.ad.jp domain. That is a network-element name, not a subscriber or a server.
Notable
Despite the holder's name, this is not the Rakuten mobile network. Rakuten Mobile's consumer 4G/5G traffic rides other ASes; this one shows 1 observed BGP neighbour, which is a single-homed leaf, not the multiply-connected core a national mobile operator runs. Treat AS10012 as enterprise-telephony and business-connectivity space inherited from Fusion, and do not geolocate it to handsets.
Interesting
The address blocks are old and adjacent to other 1990s Japanese carrier allocations (61.114.160.0/20 sits right beside AS10006's 61.114.176.0/20). A handle that outlives its holder is the norm rather than the exception, and FUSION is a clean example: the legal owner has changed twice, but the routing, the domain and the router names never did.
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
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 2 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS138384 | Rakuten Mobile Network, Inc. | 277 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-29, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 4 prefixes · 20.48K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| JP | Japan | 5 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS10012- Registry name
- FUSION
- Registered
- 2000-04-27
- Last changed
- 2019-08-02
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 5 with no ROA
- ROAs
- 0 authorising AS10012
- ASPA
- no ASPA record
- IRR
- 80% registered · 4 of 5 announcements
- Route objects
- 10 naming AS10012
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
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