get ip and port from file and check if valid

#!/bin/bash
source /root/INFO
rx='([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])'

for ip in $ip_to_check; do

   if [[ $ip =~ ^$rx\.$rx\.$rx\.$rx$ ]]; then
      echo "valid:     "$ip
   else
      echo "not valid: "$ip
   fi
done

if [ "$server_port" -ge 1 ] && [ "$server_port" -le 65535 ]; then echo "$server_port is valid port number";
elif [ "$server_port" -ge 65536 ] && [ "$server_port" -le 1 ]; then echo "$server_port is  not a valid port number"; fi