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Nmap scan report for ftp.rrzn.uni-hannover.de (130.75.2.22) Host is up (0.16s latency). rDNS record for 130.75.2.22: ftp.uni-hannover.de Not shown: 997 filtered tcp ports (no-response) PORT STATE SERVICE 21/tcp open ftp 80/tcp open http 443/tcp open https Nmap done: 1 IP address (1 host up) scanned in 12.88 seconds