城市(city): unknown
省份(region): unknown
国家(country): United States
运营商(isp): unknown
主机名(hostname): unknown
机构(organization): unknown
使用类型(Usage Type): unknown
b; <<>> DiG 9.10.3-P4-Ubuntu <<>> 104.21.21.216
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 20904
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;104.21.21.216. IN A
;; AUTHORITY SECTION:
. 326 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2022021700 1800 900 604800 86400
;; Query time: 65 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Thu Feb 17 18:55:43 CST 2022
;; MSG SIZE rcvd: 106Host 216.21.21.104.in-addr.arpa. not found: 3(NXDOMAIN)Server: 183.60.83.19
Address: 183.60.83.19#53
** server can't find 216.21.21.104.in-addr.arpa: NXDOMAIN