考虑以下dig命令的运行，我只是在其中查询google.com的 IP 地址：
$ dig google.com
; <<>> DiG 9.16.1-Ubuntu <<>> google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32427
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;google.com. IN A
;; ANSWER SECTION:
google.com. 276 IN A 142.250.71.14
;; Query time: 1437 msec
;; SERVER: 192.168.225.1#53(192.168.225.1)
;; WHEN: Sun May 15 23:49:53 IST 2022
;; MSG SIZE rcvd: 55
响应说142.250.71.14是 IP。现在，如果我要使用相同的 IP 运行反向 DNS 查找，例如：
$ dig -x 142.250.71.14
; <<>> DiG 9.16.1-Ubuntu <<>> -x 142.250.71.14
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61497
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;14.71.250.142.in-addr.arpa. IN PTR
;; ANSWER SECTION:
14.71.250.142.in-addr.arpa. 67394 IN PTR maa03s34-in-f14.1e100.net.
;; Query time: 15 msec
;; SERVER: 192.168.225.1#53(192.168.225.1)
;; WHEN: Sun May 15 23:52:46 IST 2022
;; MSG SIZE rcvd: 83
响应说 IP 指向maa03s34-in-f14.1e100.net（而不是google.com）。如何解释这种差异？
