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Nmap scan report for ns1.mucdn.net (72.21.80.5) Host is up (0.00048s latency). Other addresses for ns1.mucdn.net (not scanned): 2606:2800:1::5 rDNS record for 72.21.80.5: ns1.edgecastcdn.net Not shown: 999 filtered tcp ports (no-response) PORT STATE SERVICE 53/tcp open domain Nmap done: 1 IP address (1 host up) scanned in 4.92 seconds