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Nmap scan report for dns.trouble-free.net (66.45.228.79) Host is up (0.060s latency). rDNS record for 66.45.228.79: city.interserver.net Not shown: 998 filtered tcp ports (no-response) PORT STATE SERVICE 53/tcp open domain 4321/tcp open rwhois Nmap done: 1 IP address (1 host up) scanned in 9.78 seconds