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IP
Nmap scan report for ntp.nber.org (198.71.6.1) Host is up (0.070s latency). rDNS record for 198.71.6.1: ns1.nber.org Not shown: 999 filtered tcp ports (no-response) PORT STATE SERVICE 113/tcp closed ident Nmap done: 1 IP address (1 host up) scanned in 7.13 seconds