AS7511 — SYNAPSE SYNAPSE Co.,Ltd.

Network type: residential

AS7511 announces 17 IPv4 prefixes covering 78,848 addresses and 1 IPv6 prefixes.

About this network

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 202.79.0.0/20 block registered to Kansai Broadband Corp. of Kobe, resolves under kansai-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.

Announced prefixes

• 101.50.60.0/22
• 101.53.104.0/21
• 103.53.120.0/22
• 103.208.96.0/22
• 110.92.32.0/19
• 124.146.64.0/18
• 202.79.0.0/22
• 202.79.8.0/21
• 202.95.32.0/19
• 202.208.160.0/19
• 203.111.192.0/20
• 203.140.160.0/20
• 203.145.96.0/20
• 203.147.112.0/20
• 210.146.80.0/20
• 210.237.32.0/19
• 219.100.8.0/22
• 2401:c800::/32

Upstream networks

• AS9607 BroadBand Tower, Inc.
• AS2518 BIGLOBE Inc.
• AS6939 Hurricane Electric LLC
• AS17676 SoftBank Corp.
• AS24482 SG.GS
• AS17639 Converge ICT Solutions Inc.
• AS20485 Joint Stock Company TransTeleCom
• AS8966 EMIRATES TELECOMMUNICATIONS GROUP COMPANY (ETISALAT GROUP) PJSC

Adjacent networks

• AS9607 BroadBand Tower, Inc.
• AS2518 BIGLOBE Inc.
• AS6939 Hurricane Electric LLC
• AS17676 SoftBank Corp.
• AS24482 SG.GS
• AS17639 Converge ICT Solutions Inc.
• AS20485 Joint Stock Company TransTeleCom
• AS8966 EMIRATES TELECOMMUNICATIONS GROUP COMPANY (ETISALAT GROUP) PJSC

Internet exchanges

• BroadBand Internet eXchange Tokyo — Tokyo, Japan
• JPIX Tokyo — Tokyo, Japan
• BroadBand Internet eXchange Singapore — Singapore, Singapore
• BroadBand Internet eXchange Osaka — Osaka, Japan
• JPIX Osaka — Osaka, Japan
• BroadBand Internet eXchange Hong Kong — Hong Kong, China