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Nmap scan report for dnsauth1.sys.gtei.net (4.2.49.2) Host is up (0.00065s latency). rDNS record for 4.2.49.2: dnsauth1.level3.net Not shown: 999 filtered tcp ports (no-response) PORT STATE SERVICE VERSION 53/tcp open domain (unknown banner: hostmaster@Level3.net) | dns-nsid: | NSID: dnsauth1.level3.net (646e7361757468312e6c6576656c332e6e6574) | id.server: dnsauth1.level3.net |_ bind.version: hostmaster@Level3.net | fingerprint-strings: | DNSVersionBindReqTCP: | version | bind |_ hostmaster@Level3.net 1 service unrecognized despite returning data. If you know the service/version, please submit the following fingerprint at https://nmap.org/cgi-bin/submit.cgi?new-service : SF-Port53-TCP:V=7.92%I=7%D=11/6%Time=672B3846%P=x86_64-redhat-linux-gnu%r( SF:DNSVersionBindReqTCP,42,"\0@\0\x06\x85\0\0\x01\0\x01\0\0\0\0\x07version SF:\x04bind\0\0\x10\0\x03\xc0\x0c\0\x10\0\x03\0\0\0\0\0\x16\x15hostmaster@ SF:Level3\.net"); Warning: OSScan results may be unreliable because we could not find at least 1 open and 1 closed port Aggressive OS guesses: Linux 3.2 - 4.9 (93%), Linux 3.10 - 4.11 (92%), Linux 3.18 (92%), Linux 5.1 (90%), Crestron XPanel control system (90%), Linux 3.16 (89%), ASUS RT-N56U WAP (Linux 3.4) (87%), Linux 3.1 (87%), Linux 3.2 (87%), HP P2000 G3 NAS device (87%) No exact OS matches for host (test conditions non-ideal). Network Distance: 9 hops TRACEROUTE (using port 53/tcp) HOP RTT ADDRESS 1 0.54 ms 208.76.251.177.rdns.ColocationAmerica.com (208.76.251.177) 2 0.63 ms gw.mcom-colocationamerica.com (208.64.231.81) 3 0.72 ms r2b4.n1.p1401.lax.multacom.net (64.69.46.11) 4 0.85 ms ce-1-4-2.a04.lsanca07.us.bb.gin.ntt.net (128.241.15.73) 5 0.53 ms ae-16.r24.lsanca07.us.bb.gin.ntt.net (129.250.3.78) 6 1.09 ms ae-1.a03.lsanca07.us.bb.gin.ntt.net (129.250.3.142) 7 ... 8 9.83 ms ae10.11.edge6.LosAngeles1.net.lumen.tech (4.69.220.153) 9 0.56 ms dnsauth1.level3.net (4.2.49.2) OS and Service detection performed. Please report any incorrect results at https://nmap.org/submit/ . Nmap done: 1 IP address (1 host up) scanned in 41.27 seconds