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Nmap scan report for dns1.vietel.com.vn (203.113.131.1) Host is up (0.24s latency). Other addresses for dns1.vietel.com.vn (not scanned): 2402:800:20ff:1111::1 Not shown: 934 filtered tcp ports (no-response), 65 filtered tcp ports (host-prohibited) PORT STATE SERVICE 53/tcp open domain Nmap done: 1 IP address (1 host up) scanned in 12.33 seconds