curl-w32/docs/cmdline-opts/local-port.md

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Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. curl local-port <num/range> Force use of RANGE for local port numbers 7.15.2 connection single
globoff
--local-port 1000-3000 $URL

--local-port

Set a preferred single number or range (FROM-TO) of local port numbers to use for the connection(s). Note that port numbers by nature are a scarce resource so setting this range to something too narrow might cause unnecessary connection setup failures.