AS208172 — Proton AG

AS208172, operated by Proton AG, is hosting space that is heavily used for anonymization. Of the 21 addresses we have observed on it, 100% are VPN endpoints. An address arriving from this network usually says where a tunnel ends, not where the person behind it is.

21 of the 21 observed addresses (100%) carried a notable risk score of 40 or higher when last checked. That concentration is the network's defining feature: it does not mean any individual visitor is hostile, but it does mean this network's addresses start from a lower trust position than ordinary hosting space.

Addresses on this network have been looked up through Predax between May 4, 2026 and August 30, 2026. Each figure on this page reflects an address's most recent check, not a permanent record.

Geographically, the observed addresses span 7 countries, with the largest share (6 of 21) geolocating to United States.

Screening traffic from this network is a defensible default for checkout, login and signup flows: the anonymization share is high enough that an address here tells you little about who is actually connecting.

It is still worth screening by score rather than blocking the whole network — VPN use is mainstream, and a blanket network block also turns away the privacy-conscious customers routing through it. A challenge (CAPTCHA or verification) keeps them while stopping most automation.

If your site takes signups, logins or payments, screening traffic from networks like this one is the practical takeaway — the Predax Security plugin for WordPress and the WooCommerce fraud plugin both do it automatically, challenging by score instead of blocking the whole network.