asn.dev

Autonomous system

AS203846 SESTERCE

Unclassified RIPE

IPv4 addresses 256 1 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly FR
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

Sesterce

France · AI-generated

datacenter ai hosting

SESTERCE is the autonomous system for Sesterce France LABS SAS.

What it's used for

  • The address space carries infrastructure for Sesterce, a data center operator, as indicated by the netname FR-SESTERCE-20220111 and the registrant SESTERCE France LABS SAS.
  • The AS announces 256 IPv4 addresses and 1 IPv6 prefix, with only 2 observed neighbours, indicating a small-scale, self-contained network rather than a transit provider.
  • Traffic from this AS consists of data center workloads, including AI compute resources, given Sesterce's business focus on developing and operating large-scale data center campuses.

Notable

  • The registrant SESTERCE France LABS SAS matches the AS handle and the announced prefix, confirming consistent ownership.
  • Sesterce has announced a joint venture with SoftBank Group to develop a 1 GW AI data center campus in Bosquel, France.
  • The inventory consists of a single /24 IPv4 block and a /29 IPv6 prefix, representing a compact address allocation for a specialized infrastructure provider.

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

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

2 upstream, 0 downstream and 4 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS1299Arelion Sweden AB48
AS49028D-LAKE SAS45

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-26, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 1 prefixes · 256 addresses IPv6 1 prefixes

CountryNamePrefixes
FRFrance2

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS203846
Registry name
SESTERCE
Registrant
lir-fr-sesterce-1-MNT
Abuse contact
nicolas@sesterce.com
Registered
2025-11-13
Last changed
2025-11-13
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 2 valid, 0 with no ROA
ROAs
2 authorising AS203846
ASPA
2 declared providers
IRR
100% registered · 2 of 2 announcements
Route objects
2 naming AS203846

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: 446 networks and 1,852 prefixes, as published 2026-10-27. 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

Cross-check