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Keeping one IP
When the address has to hold still, and the port that makes it.
The port decides
Port 823 hands out a new address on every request. That suits data collection and breaks anything with a session: a cart, a login, a multi-step form.
Ports 10000 to 20000 behave differently: each port holds its own address for as long as the session lives. Need five parallel threads on five addresses? Take five consecutive ports.
curl -x http://LOGIN:PASSWORD@gw.dataimpulse.com:10001 https://ipinfo.io/jsonHow long it holds
The address stays while requests keep coming through that port. After a long pause it may change — that is how home networks behave, not a setting.