How Proxy Assignment Works on Per Proxy Plans

On Proxidize Per Proxy plans, each proxy is assigned to an upstream device, and routed based on the location and carrier filters you set. 

One Proxy Per Device

Each proxy on a Per Proxy plan is routed through its own upstream device. No two proxies within your own account will share the same upstream device at the same time. This means that across your own proxy pool, each proxy operates on a distinct upstream and your proxies will never overlap or interfere with each other.

When you rotate, your proxy moves to a different upstream device and receives a new IP. This switch happens on the backend, so nothing changes on your side. Your credentials, tools, and integrations continue to work exactly as before.

Because our infrastructure is built around location switching, upstream devices are pooled across locations rather than permanently assigned to a single account. This is what allows you to switch locations and carriers on demand. Your proxy is on its own dedicated upstream device the vast majority of the time, though on busy or congested locations there is a small chance of temporary sharing between accounts.

One important detail is that mobile carriers use Carrier-Grade NAT (CGNAT) to manage their public IP pools. This is standard practice across mobile networks. As a result, even when two proxies are running on completely separate upstream devices, they may occasionally exit through the same public IP depending on carrier-level conditions. This behavior is not specific to Proxidize. It is a normal characteristic of how mobile networks operate globally and is outside of our control.

Setting Your Filters

Each proxy can be configured with two filters that determine which upstream device it routes through:

• Location: Choose a specific U.S. city (e.g. Chicago, Dallas, Los Angeles) or select Fastest to automatically route through the best performing available location.
• Carrier: Choose a specific mobile carrier (Purple, Blue, or Red Network) or select Fastest to automatically use the best available carrier.

You can set these filters at any time from your proxy dashboard. Once saved, Proxidize will route your proxy traffic to matche your selected city and carrier.

Your Credentials Never Change

When your filters are applied or your proxy rotates, what changes is the upstream device your traffic is routed through, not your proxy credentials.

Your hostname, port, username, and password all stay exactly the same. You don't need to update any tools, scripts, or integrations. Everything continues to work as before, just routing through a new IP on the backend.

What Happens If Your Selected Location or Carrier Is Unavailable

Unavailable locations and carriers are greyed out in the dashboard and cannot be selected. If a location or carrier you're currently using becomes unavailable, your proxy will automatically reroute to another upstream device, either within the same location if possible, or a different location if not. Service continues without any action required on your end.

Summary