How To Ping Device Using Port Number from Linux

I used nmap and it works like a charm

yum install nmap

[root@apache02 ~]# nmap -p 80 app.testdomain.com

Output:

Starting Nmap 5.51 ( http://nmap.org ) at 2014-06-11 20:48 BST
Nmap scan report for app.testdomain.com (172.16.165.229)
Host is up (0.22s latency).
PORT STATE SERVICE
80/tcp filtered http

Nmap done: 1 IP address (1 host up) scanned in 2.59 seconds

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