chip_rosenthal

Why not just use nmap?

  $ 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.