城市(city): unknown
省份(region): unknown
国家(country): Reserved
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 <<>> 242.251.78.231
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 49176
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;242.251.78.231. IN A
;; AUTHORITY SECTION:
. 304 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2019103100 1800 900 604800 86400
;; Query time: 59 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Thu Oct 31 23:41:29 CST 2019
;; MSG SIZE rcvd: 118Host 231.78.251.242.in-addr.arpa. not found: 3(NXDOMAIN)Server: 183.60.83.19
Address: 183.60.83.19#53
** server can't find 231.78.251.242.in-addr.arpa: NXDOMAIN