dig redhat.com
;; QUESTION SECTION:
;redhat.com. IN A
;; ANSWER SECTION:
redhat.com. 3600 IN A 209.132.183.105
我们得到ip地址209.132.183.105
----域的A记录redhat.com
。
现在我想从 ip-- 获取域名209.132.183.105
。
或许你介绍两种获取方式。
nslookup 209.132.183.105
Server: 192.168.1.1
Address: 192.168.1.1#53
Non-authoritative answer:
105.183.132.209.in-addr.arpa name = redirect.redhat.com.
Authoritative answers can be found from:
dig -x 209.132.183.105
; <<>> DiG 9.9.5-9+deb8u7-Debian <<>> -x 209.132.183.105
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 62599
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1280
;; QUESTION SECTION:
;105.183.132.209.in-addr.arpa. IN PTR
;; ANSWER SECTION:
105.183.132.209.in-addr.arpa. 519 IN PTR redirect.redhat.com.
;; Query time: 1 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Sat Nov 19 15:11:33 CST 2016
;; MSG SIZE rcvd: 90
不幸的是,结果不是redhat.com
,redirect.redhat.com
而是 PTR 记录209.132.183.105
。
我是否可以得出结论,如果 ip 是域名的记录,则无法从 IP 地址中获取域名?