AS209103 Proton AG
vpn · based in Switzerland · IPLogs default verdict: VPN detected
- ASN
- AS209103
- Name
- Proton AG
- Category
- vpn
- Country
- Switzerland
- IPLogs verdict
- VPN detected
- Proxy backbone
- No
About Proton AG
ProtonVPN officially registered ASN. Swiss privacy provider.
VPN providers using AS209103
Commercial VPN products that route exit traffic through Proton AG. Any IP announced from this ASN is a confirmed VPN exit without requiring a probe.
How IPLogs classifies AS209103
When the detection engine sees an IP that routes through AS209103, it checks three lists: (1) the curated VPN-provider ASN list, (2) the datacenter / hosting ASN list, and (3) the trusted CDN allowlist. Matches produce one of vpn_asn, dc_ip, or no flag respectively. Keywords in the org name (e.g. "vpn", "proxy", "anonym") may also trigger vpn_org_keyword even for unknown ASNs.
Use the ASN as a shortcut when you want to block a whole hosting provider at the edge rather than maintaining a per-IP list.
Authoritative sources for AS209103
Third-party registries where you can verify the announcements, peer relationships, and WHOIS registration for this ASN.
Related ASNs
Other vpn ASNs in Switzerland catalogued by IPLogs.
Frequently asked questions about AS209103
+Is AS209103 (Proton AG) a VPN, datacenter, or residential network?
IPLogs classifies Proton AG (AS209103) as a commercial VPN network based in Switzerland. The default verdict for any IP that routes through this ASN is "VPN detected".
+Which VPN providers use AS209103?
ProtonVPN route exit traffic through Proton AG. Any IP announced from this ASN is treated as a confirmed VPN exit, with no active probe required.
+Who operates AS209103 and where is it registered?
Proton AG (AS209103) operates in Switzerland.
+How do I check or block AS209103 traffic?
Send any suspect IP to the IPLogs API — POST https://iplogs.com/v1/check with body {"ip":"<ip>"} — and the response reports the originating ASN plus whether it matched the VPN, datacenter, or CDN lists. To block a whole hosting network at the edge, filter on AS209103 instead of maintaining a per-IP list. Copy-paste recipes for Cloudflare WAF, Nginx, and Stripe Radar are at /guides/block-vpn-traffic.