asn.dev

Autonomous system

AS204509 SYN SEINE ET YVELINES NUMERIQUE

Unclassified RIPE

IPv4 addresses 1.02K 1 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly FR
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

Seine-et-Yvelines Numérique

France · AI-generated

regional broadband france public

SYN is operated by Seine-et-Yvelines Numérique.

What it's used for

  • The space carries regional broadband infrastructure, identified by the netname FR-SEINEETYVELINES and registrant SEINE ET YVELINES NUMERIQUE.
  • The AS announces 1024 IPv4 addresses across 1 prefix (193.239.12.0/22) with 1 observed neighbour, indicating a small, self-contained access network rather than a transit provider.
  • Traffic consists of Very High Speed internet (THD) subscriber connections and digital services deployed across the Seine-et-Yvelines department in Île-de-France.

Notable

  • The RDAP registrant SEINE ET YVELINES NUMERIQUE matches the registry holder SYN SEINE ET YVELINES NUMERIQUE, confirming consistent ownership.
  • The address inventory is a single contiguous /22 block, typical of a regional public authority managing a dedicated fiber or broadband estate.

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

1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS20900IMS Networks SAS294

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-03, 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 · 1.02K addresses IPv6 0 prefixes

CountryNamePrefixes
FRFrance1

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS204509
Registry name
SYN
Registrant
lir-fr-seineetyvelines-1-MNT
Abuse contact
abuse@synadm.fr
Registered
2026-01-21
Last changed
2026-09-09
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 5 valid, 0 with no ROA
ROAs
5 authorising AS204509
ASPA
no ASPA record
IRR
100% registered · 5 of 5 announcements
Route objects
3 naming AS204509

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: 451 networks and 1,853 prefixes, as published 2026-11-04. 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