Shell/Bash script telnet testing a multicast address -

i trying create shell/bash script telnet test multicast address. have following:

telnet <ip_address> <port_number> 

however, hangs:

<server_name>% ./telnet_test.sh trying <ip_address>... connected <ip_address>. escape character '^]'. //hangs here few seconds... connection <ip_address> closed foreign host. 

how can test multicast address , return if successful not have wait until connection closed foreign host.

i need test multiple addresses in same script.

edit:

i should have mentioned on bank network tightly controlled firewalls , cannot have netcat installed.

the purpose of test see if can connection route current host.

use netcat instead.
-z - scan listening daemons.
-w 3 - timeout after 3 seconds

#!/bin/bash  host_list="www.google.com www.stackoverflow.com" port=80  host in $host_list;     nc -z -w 3 $host $port > /dev/null 2>&1     if [[ $? = 0 ]];         printf "%s%s%s\n" " [$host:" "up" "]"     else         printf "%s%s%s\n" " [$host:" "down" "]"     fi done