Autonomous system
AS7511 SYNAPSE SYNAPSE Co.,Ltd.
Residential APNIC
Summary
SYNAPSE
isp eyeball legacy
SYNAPSE — SYNAPSE Co., Ltd., a regional internet service provider based in Kagoshima, at the southern end of Japan's Kyushu island.
What it's used for
- Consumer and small-business internet access in and around Kagoshima, mostly delivered over NTT's FLET'S fibre and DSL access lines.
- Hosting, mail and other value-added services for its subscriber base.
Notable
- An eyeball network, and the rDNS says so plainly: the bulk of its ~79k IPv4 addresses resolve as
flets-NNN-NNN-NNN-NNN.fip.synapse.ne.jp— per-subscriber names generated for FLET'S access customers. - A minority of its space, the
202.79.0.0/20block registered to Kansai Broadband Corp. of Kobe, resolves underkansai-bb.com. Synapse's broadband access service has historically ridden Kansai Broadband's DSL infrastructure, so the two networks' addressing is intertwined; part of that same /20 is announced by AS7529 instead.
Interesting
- Japan has an unusually deep bench of prefecture-scale ISPs like this one, a consequence of NTT's FLET'S model: the access line is wholesaled, so a local provider can sell service without owning fibre.
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 6 exchanges in 3 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| BroadBand Internet eXchange Tokyo | Tokyo, Japan | 101.203.88.134 |
| JPIX Tokyo | Tokyo, Japan | 210.171.224.208 |
| BroadBand Internet eXchange Singapore | Singapore, Singapore | 103.231.152.20 |
| BroadBand Internet eXchange Osaka | Osaka, Japan | 218.100.9.84 |
| JPIX Osaka | Osaka, Japan | 103.246.232.208 |
| BroadBand Internet eXchange Hong Kong | Hong Kong, China | 103.203.158.20 |
Transit providers
9 upstream, 0 downstream and 14 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 2026-10-14, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 17 prefixes · 78.85K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| JP | Japan | 18 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS7511- Registry name
- SYNAPSE
- Registered
- 1997-03-03
- Last changed
- 2017-05-23
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 20 valid, 0 with no ROA
- ROAs
- 19 authorising AS7511
- ASPA
- no ASPA record
- IRR
- 100% registered · 20 of 20 announcements
- Route objects
- 20 naming AS7511
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: 442 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