Simple snippet to check if a list of hosts has the specified port open or closed

check_if_port_is_listening_on_host_list.py

import socket
from contextlib import closing

hosts = ["host1", "host2", "host3"]
port = 22
timeout_in_seconds = 2

hosts_with_opened_port = []
hosts_with_closed_port = []
hosts_with_errors = []


def check_port(host, port, timeout_in_seconds):
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.settimeout(timeout_in_seconds)
    with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as sock:
        try:
            result = sock.connect_ex((host, port))
            if result == 0:
                print("Port {} is *** OPEN *** on host: {}".format(port, host))
                hosts_with_opened_port.append(host)
            else:
                print("Port {} is not open on host: {}".format(port, host))
                hosts_with_closed_port.append(host)
        except socket.gaierror:
            print("Port {} check returns a network *** ERROR *** on host: {}".format(port, host))
            hosts_with_errors.append(host)


for host in hosts:
    check_port(host, port, timeout_in_seconds)

print("\nHosts with opened port:")
print(hosts_with_opened_port)
print("\nHosts with closed port:")
print(hosts_with_closed_port)
print("\nHosts with errors:")
print(hosts_with_errors)