STJ SAS is a French Société par Actions Simplifiée operating as STJ Telecom, a VoIP provider for call centers. Its internet presence is limited to AS210839 and a single /24 IPv4 block, with no active BGP announcements observed. Registry records confirm its legal identity and ARCEP operator number, but no PeeringDB, customer, or financial data is publicly available. Key watchpoints include the first BGP appearance of its prefix, changes to RIPE aut-num or org records, and corporate filing updates. The main uncertainty is the mismatch between broad declared activities and the tiny observable network footprint.

STJ SAS

STJ SAS is a French VoIP operator trading as STJ Telecom, publicly associated with a single autonomous system, AS210839, and one /24 IPv4 prefix that is currently unannounced in BGP. Its declared role as a call-center voice provider creates a narrow, single-threaded dependency on internet numbering resources, with no observable active routing or customer evidence.

Why It Matters

The practical impact lies in the potential for service disruption: if AS210839 or its prefix becomes unreachable due to routing changes, registry errors, or upstream failures, call center customers relying on STJ Telecom would experience voice service outages. Conversely, changes in registry data can signal mergers, acquisitions, or operational shifts that alter risk exposure.

What Public Sources Show

STJ SAS, trading as STJ Telecom, is a French telecommunications operator that publicly positions itself as a voice-over-IP provider for call centers. The company is registered at 16 Rue du Chateau in Demouville, France, holds ARCEP operator number 14-0340, and operates under SIREN 795 206 523.

Its entire public internet presence is defined by a single autonomous system, AS210839, and one assigned IPv4 prefix, 185.224.172.0/24, with no IPv6 allocations. RIPE registry records show the ASN was assigned in August 2021 under the sponsoring organisation ORG-Ns139-RIPE, with import and export policies pointing to upstreams AS199248 and AS8218.

Despite holding these resources, BGP monitoring shows no current announcements for 185.224.172.0/24, meaning the prefix may not be actively routed or is used privately. This makes STJ SAS a concentrated dependency: any change to the registry record, a route leak, or a withdrawal could immediately disrupt the call center voice services that depend on it.

The company’s own legal notice and commercial registry entries list broader activities—internet access, data hosting, network capacity resale—but no customer references, service pages, or financial disclosures confirm which of these are operational. A PeeringDB record is absent, and no individual executives or technical contacts are publicly named, leaving the operating model largely opaque.

Observers should monitor for the first BGP appearance of 185.224.172.0/24, which would confirm active use and potentially reveal downstream dependencies. Changes to the RIPE aut-num or organisation objects, such as a new sponsoring LIR or altered contact information, can signal ownership shifts. Corporate registry updates—dissolution, address moves, director appointments—directly affect the company’s legal standing.

Additional signals include the emergence of a PeeringDB record, which would disclose peering policy and traffic levels, and reconciliation of conflicting capital figures between the company website and public aggregators. Until active routing is observed, the operator’s true scale and customer risk remain uncertain.

Operating Surface

STJ SAS performs the role of a voice-over-IP operator for call centers, as stated in its legal notice and ARCEP registration, while also listing broader telecom and IT activities in the French commercial registry. In internet infrastructure, it controls AS210839 and the 185.224.172.0/24 prefix, serving as an origin for traffic under its own routing policy—though that prefix is not currently seen in the global routing table.

STJ SAS warrants monitoring because its entire public internet presence—a single ASN and one IPv4 prefix—forms the reachability layer for call center VoIP services. Any registry change, route announcement, or upstream reconfiguration can immediately impact those downstream voice operations, making it a concentrated risk point for network operators and incident responders.

Watchpoints

STJ SAS represents a low-visibility but potentially brittle dependency for call center voice services; its operational significance is entirely gated on whether its prefix becomes actively announced and on the stability of its small upstream set.

First BGP announcement of 185.224.172.0/24; any change to RIPE aut-num or organisation records; dissolution or director changes in French commercial registry; appearance of a PeeringDB entry; reconciliation of conflicting capital figures.

No active BGP data, no customer roster, no financials, no named executives, and conflicting capital figures. Routing telemetry and updated corporate filings are needed to reduce uncertainty.

Sources

• Registry RDAP / WHOIS record - public-source identity and registry context for STJ SAS.
• stj-telecom.com - Official operator page lists stj-telecom.com, a Demouville/Caen address, generic contact information, ARCEP operator number 14-0340, RCS Caen identifier 795 206 523 00016, VAT number FR29795206523, and describes STJ Telecom as a VoIP operator for call centers.
• pappers.fr - Public company-registry aggregator lists STJ (STJ TELECOM), SIREN 795 206 523, active status, SAS legal form, address at 16 Rue du Chateau in Demouville, wireless telecommunications activity, and declared telecom/IT/network-capacity activities.
• Registry RDAP / WHOIS record - RIPE RDAP is the authoritative public registry path for AS210839 in the RIPE NCC service region and supports the AS210839 registry context for STJ/ORG-SA4766-RIPE.
• Registry RDAP / WHOIS record - Mirrors RIPE RPSL fields for AS210839: as-name STJ, org ORG-SA4766-RIPE, sponsoring-org ORG-Ns139-RIPE, status ASSIGNED, created and last-modified 2021-08-26, import/export policy with AS199248 and AS8218, and organisation STJ SAS in France.
• ipinfo.io - Lists AS210839 as STJ SAS in France, tied to stj-telecom.com, with RIPE registry, allocation/update date of Aug 26 2021, 256 IPv4 addresses, zero IPv6 addresses, and netblock 185.224.172.0/24.
• radar.cloudflare.com - Provides a public routing page for AS210839 STJ in France, including routing statistics, announced IP address space, prefixes announced, connectivity, and BGP announcement views.
• Internet registry record - IANA lists the 210332-211355 autonomous-system-number range as assigned by RIPE NCC with RIPE RDAP service; AS210839 falls inside that RIPE NCC range.