Autonomous system
AS7521 MFEED INTERNET MULTIFEED CO.
Residential RIPE
Summary
Internet Multifeed (JPNAP)
ixp legacy
MFEED — INTERNET MULTIFEED CO., founded in 1997 as a joint venture of NTT and IIJ. It operates JPNAP, one of Japan's main internet exchanges, along with data centre, IPv6 transition (transix) and public time services.
What it's used for
- Running the JPNAP exchange fabrics in Tokyo and Osaka, where Japanese ISPs and content networks peer.
- Multifeed's own service and management infrastructure: the rDNS on its space is operational, not customer-facing — firewalls, VPN concentrators and servers under
mfeed.ad.jp. - Serving
ntp.jst.mfeed.ad.jp, the widely used public NTP service that distributes Japan Standard Time from NICT's clocks.
Notable
- Only ~4,900 IPv4 addresses, which badly understates it. Like any exchange operator, the traffic it handles crosses peering LANs that are not globally routed, so none of it shows up in this AS's prefix count.
- Infrastructure with no honest commercial "kind": it is not an eyeball ISP, a hosting provider or a transit seller. Compare AS7527 (JPIX), Japan's other major exchange operator.
Interesting
- The public NTP service means a very large share of clocks in Japan, on consumer routers and servers alike, are ultimately steered by hosts in this small AS.
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, 6 downstream and 12 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS55391 | INTERNET MULTIFEED CO. | 498 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 8 prefixes · 4.86K addresses IPv6 15 prefixes
| Country | Name | Prefixes |
|---|---|---|
| JP | Japan | 23 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS7521- Registry name
- MFEED
- Registered
- 1997-03-03
- Last changed
- 2013-05-30
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 9 valid, 0 with no ROA
- ROAs
- 12 authorising AS7521
- ASPA
- no ASPA record
- IRR
- 100% registered · 9 of 9 announcements
- Route objects
- 12 naming AS7521
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: 440 networks and 1,773 prefixes, as published 2026-10-13. 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