get open TCP port in Python

Question

I want to get any random open TCP port on localhost in Python. What is the easiest way?

Answer 1

The ephemeral ports basically lie in range 49152 - 65535. if you want to check ports in bigger range then just change the values in randint.

import pustil
from random import randint
def getfreeport():
    port = randint(49152,65535)
    portsinuse=[]
    while True:
        conns = pstuil.net_connections()
        for conn in conns:
            portsinuse.append(con.laddr[1])
        if port in portsinuse:
            port = randint(49152,65535)
        else:
            break
    return port