Option available only for Residential or Mobile zones with multiple IPs allocated. To target a specific gIP allocated to your zone, use -gip-gip_name request parameter.

curl "http://target.site" \
    --proxy brd.superproxy.io:22225 \
    --proxy-user brd-customer-<CUSTOMER_ID>-zone-<ZONE_NAME>-gip-us_7922_fl_hollywood_0:<ZONE_PASSWORD>
Os targetingSelect a specific IP