Nmap scan report for dns1.p01.nsone.net (198.51.44.1)
Host is up (0.0016s latency).
Other addresses for dns1.p01.nsone.net (not scanned): 2620:4d:4000:6259:7:1:0:1
Not shown: 99 filtered tcp ports (no-response)
PORT   STATE SERVICE
53/tcp open  domain

Nmap done: 1 IP address (1 host up) scanned in 2.01 seconds