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Daniel, > Now i have an answer from dig > > [ldm@ocotillo ~]$ dig 148.225.111.150 > > ; <<>> DiG 9.7.3-P3-RedHat-9.7.3-8.P3.el6 <<>> 148.225.111.150 > ;; global options: +cmd > ;; Got answer: > ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 11684 > ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 > > ;; QUESTION SECTION: > ;148.225.111.150. IN A > > ;; AUTHORITY SECTION: > . 9599 IN SOA a.root-servers.net. > nstld.verisign-grs.com. 2018081501 1800 900 604800 86400 > > ;; Query time: 0 msec > ;; SERVER: 148.225.1.9#53(148.225.1.9) > ;; WHEN: Wed Aug 15 12:27:34 2018 > ;; MSG SIZE rcvd: 108 I'm afraid it still doesn't work. If it did, then the output would have an "ANSWER SECTION" like this: [steve@gilda ldm7]$ dig -x 128.117.144.144 ; <<>> DiG 9.9.4-RedHat-9.9.4-61.el7 <<>> -x 128.117.144.144 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13620 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 3 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; MBZ: 0005 , udp: 4096 ;; QUESTION SECTION: ;144.144.117.128.in-addr.arpa. IN PTR ;; ANSWER SECTION: 144.144.117.128.in-addr.arpa. 5 IN PTR gilda.unidata.ucar.edu. ;; AUTHORITY SECTION: 144.117.128.in-addr.arpa. 5 IN NS zero.unidata.ucar.edu. 144.117.128.in-addr.arpa. 5 IN NS laraine.unidata.ucar.edu. ;; ADDITIONAL SECTION: laraine.unidata.ucar.edu. 5 IN A 128.117.140.62 zero.unidata.ucar.edu. 5 IN A 128.117.140.56 ;; Query time: 4 msec ;; SERVER: 192.168.174.2#53(192.168.174.2) ;; WHEN: Wed Aug 15 15:29:24 MDT 2018 ;; MSG SIZE rcvd: 166 I also forgot to use the "-x" option, which is necessary when attempting to convert an IP address into a hostname. Sorry. Try the command "dig -x 148.225.111.150". Regards, Steve Emmerson Ticket Details =================== Ticket ID: MBM-691384 Department: Support LDM Priority: Normal Status: Closed =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.