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Nmap scan report for ns.web4u.cz (185.14.224.241) Host is up (0.16s latency). Other addresses for ns.web4u.cz (not scanned): 2001:1568:fd::241 Not shown: 998 filtered tcp ports (no-response), 1 filtered tcp ports (port-unreach) PORT STATE SERVICE 53/tcp open domain Nmap done: 1 IP address (1 host up) scanned in 15.74 seconds