$ nmap -Pn -p domain e.gtld-servers.net
Starting Nmap 7.01 ( https://nmap.org ) at 2016-05-15 13:32 CDT
Nmap scan report for e.gtld-servers.net (192.12.94.30)
Host is up (0.072s latency).
PORT STATE SERVICE
53/tcp open domain
Nmap done: 1 IP address (1 host up) scanned in 0.22 seconds
The repeated ping function -- which is intended to display packet loss or delay -- isn't useful for TCP services.
The repeated ping function -- which is intended to display packet loss or delay -- isn't useful for TCP services.