Nmap scan report for a3.uberns.com (216.59.60.3) Host is up (0.00036s latency). Not shown: 999 closed ports PORT STATE SERVICE VERSION 53/tcp open domain (generic dns response: FORMERR) | dns-nsid: |_ id.server: LAX2 | fingerprint-strings: | DNSVersionBindReqTCP: | version |_ bind 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=7.70%I=7%D=11/18%Time=655942B5%P=x86_64-redhat-linux-gnu%r SF:(DNSVersionBindReqTCP,20,"\0\x1e\0\x06\x81\x05\0\x01\0\0\0\0\0\0\x07ver SF:sion\x04bind\0\0\x10\0\x03")%r(DNSStatusRequestTCP,E,"\0\x0c\0\0\x90\x0 SF:1\0\0\0\0\0\0\0\0"); Device type: load balancer Running (JUST GUESSING): Citrix embedded (91%) Aggressive OS guesses: Citrix NetScaler load balancer (91%) No exact OS matches for host (test conditions non-ideal). Network Distance: 6 hops TRACEROUTE (using port 110/tcp) HOP RTT ADDRESS 1 0.20 ms 208.76.251.177 2 0.69 ms gw.mcom-colocationamerica.com (208.64.231.81) 3 0.56 ms multacom.com (96.45.162.9) 4 0.42 ms ae-8.a03.lsanca07.us.bb.gin.ntt.net (129.250.205.121) 5 0.45 ms xe-1-5-0-2.a03.lsanca07.us.ce.gin.ntt.net (130.94.195.50) 6 0.37 ms a3.uberns.com (216.59.60.3) 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 49.68 seconds