AS8399 — SEWAN-

AS8399 announces 37 IPv4 prefixes covering 165,376 addresses and 4 IPv6 prefixes.

About this network

SEWAN-FR is Sewan SAS, a French telecom operator that sells connectivity, voice and cloud services through IT resellers rather than directly to the public. Its customers are the small and mid-sized businesses those partners serve.

What it's used for

• Business internet access and hosted voice. Reverse DNS resolves under rev.sewan.fr, including an explicit IP-ADDR.isp.rev.sewan.fr form on the access ranges, and some customer sites appear with their own service names.
• Roughly 170,000 IPv4 addresses across 33 prefixes, plus several IPv6 blocks, which is a substantial footprint for a wholesale-through-partners model.

Notable

• A B2B network. The reverse-DNS naming shows managed access, not consumer broadband pools, and Sewan's whole commercial model is the reseller channel. Do not read the size as an eyeball network.
• The prefix inventory tells the company's growth story. Netnames carry their own registration dates, and Sewan's blocks include ones stamped 1991, 1997, 2001 and 2002 alongside modern ones. A company founded in the 2000s does not get 1991 space by asking for it, so this is inherited address space from operators it absorbed, reregistered under the Sewan name.
• Those inherited blocks include legacy space that looks out of place for a French operator, but every one of them is registered to Sewan itself. This is consolidation, not the scattered third-party inventory an address broker carries.

Interesting

• Selling telecom exclusively through resellers is uncommon enough that it changes what the network looks like from outside: many small customer sites, a large and fragmented address inventory, and almost no brand recognition among the people actually using it.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 37.97.64.0/19
• 37.97.96.0/20
• 37.139.120.0/21
• 65.39.64.0/19
• 80.251.96.0/21
• 80.251.104.0/22
• 81.93.0.0/19
• 88.213.224.0/19
• 155.2.128.0/19
• 157.143.128.0/18
• 157.143.192.0/19
• 157.143.224.0/20
• 157.143.240.0/21
• 178.174.96.0/21
• 178.174.104.0/23
• 178.174.110.0/23
• 178.255.160.0/21
• 185.6.92.0/22
• 185.8.252.0/22
• 185.24.140.0/22
• 185.32.208.0/22
• 185.42.176.0/22
• 185.50.52.0/22
• 185.65.248.0/22
• 185.76.216.0/22
• 185.218.208.0/22
• 185.249.20.0/22
• 193.142.158.0/24
• 195.135.0.0/17
• 217.74.96.0/20
• 217.181.128.0/18
• 217.181.192.0/19
• 217.181.224.0/20
• 217.181.240.0/21
• 217.181.248.0/23
• 217.181.250.0/24
• 217.181.254.0/23
• 2a02:6e8::/32
• 2a02:c440::/29
• 2a05:5cc0::/29
• 2a0b:e3c0::/29

Upstream networks

• AS1299 Arelion Sweden AB
• AS6939 Hurricane Electric LLC
• AS2914 NTT America, Inc.
• AS3257 GTT Communications Inc.
• AS174 Cogent Communications, LLC
• AS34549 meerfarbig GmbH & Co. KG
• AS35699 Adamo Telecom Iberia S.A.
• AS37721 Virtual Technologies & Solutions
• AS24482 SG.GS
• AS57463 NetIX Communications JSC
• AS34927 iFog GmbH
• AS49559 A-Systems Sp. z o.o.
• AS1836 green.ch AG
• AS48362 Stadtwerke Feldkirch
• AS212024 Marc Schmitt
• AS204092 Association GRIFON
• AS50628 Leonix Telecom SAS
• AS50673 Serverius Holding B.V.
• AS3333 Reseaux IP Europeens Network Coordination Centre (RIPE NCC)
• AS50300 CustodianDC Limited
• AS48185 team.blue NV
• AS6696 VERIXI SA
• AS20485 Joint Stock Company TransTeleCom
• AS37100 SEACOM Limited
• AS12779 IT.Gate S.p.A.

Adjacent networks

• AS1299 Arelion Sweden AB
• AS6939 Hurricane Electric LLC
• AS2914 NTT America, Inc.
• AS3257 GTT Communications Inc.
• AS174 Cogent Communications, LLC
• AS34549 meerfarbig GmbH & Co. KG
• AS35699 Adamo Telecom Iberia S.A.
• AS37721 Virtual Technologies & Solutions
• AS24482 SG.GS
• AS57463 NetIX Communications JSC
• AS34927 iFog GmbH
• AS49559 A-Systems Sp. z o.o.
• AS204092 Association GRIFON
• AS212024 Marc Schmitt
• AS1836 green.ch AG
• AS50628 Leonix Telecom SAS
• AS48362 Stadtwerke Feldkirch
• AS48185 team.blue NV
• AS50673 Serverius Holding B.V.
• AS3333 Reseaux IP Europeens Network Coordination Centre (RIPE NCC)
• AS50300 CustodianDC Limited
• AS6696 VERIXI SA
• AS37100 SEACOM Limited
• AS20485 Joint Stock Company TransTeleCom
• AS12779 IT.Gate S.p.A.

Internet exchanges

• DE-CIX Frankfurt — Frankfurt, Germany
• AMS-IX Amsterdam — Amsterdam, Netherlands
• France-IX Paris — Paris, France
• Equinix Internet Exchange Paris — Paris, France
• DE-CIX Madrid — Madrid, Spain
• ESpanix Madrid Lower LAN — Madrid, Spain
• Nine IX — Paris, France
• EuroGIX — Strasbourg, France