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b; <<>> DiG 9.10.3-P4-Ubuntu <<>> 166.53.47.109
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 31500
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;166.53.47.109. IN A
;; AUTHORITY SECTION:
. 284 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2022011000 1800 900 604800 86400
;; Query time: 61 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Mon Jan 10 18:07:46 CST 2022
;; MSG SIZE rcvd: 106Host 109.47.53.166.in-addr.arpa not found: 2(SERVFAIL)
server can't find 166.53.47.109.in-addr.arpa: SERVFAIL