Reference
Residential network IP pool size
The residential proxy network is comprised of a network of real residential internet connections globally.
The residential network is comprised of millions of residential Internet connections from multiple countries around the globe.
The exact number of available proxies on the residential network changes over time as the network participants can choose whether to share their Internet connection at any time.
Setting up a zone on the residential network
You’ll receive a different IP on every request you make to a zone on the residential network. If you want to re-use the same residential proxy across multiple requests add a session
parameter to your proxy username, Learn more about sessions here.