Once you connect to a location, you will have the same IP until you reconnect. Every new user connects to one of the available servers in random order. Surfshark also has the IP Rotator technology, which changes your IP address every once in a while without disconnecting you from the VPN network. This makes you even more difficult to track than using a simple VPN.
If you wish to have an identical IP each time you connect, you can try connecting to the Static IP locations. These locations always have a single IP address shared among all users currently connected to that specific location.
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