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b; <<>> DiG 9.10.3-P4-Ubuntu <<>> 193.209.172.134
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 46239
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;193.209.172.134. IN A
;; AUTHORITY SECTION:
. 466 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2022010800 1800 900 604800 86400
;; Query time: 20 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Sun Jan 09 00:20:24 CST 2022
;; MSG SIZE rcvd: 108Host 134.172.209.193.in-addr.arpa. not found: 3(NXDOMAIN)Server: 183.60.83.19
Address: 183.60.83.19#53
** server can't find 134.172.209.193.in-addr.arpa: NXDOMAIN