出于好奇，dig .今天我进来了。令我惊讶的是，我得到了一个IP：
$ dig .
; <<>> DiG 9.10.3-P4-Ubuntu <<>> .
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 45964
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;. IN A
;; ANSWER SECTION:
. 291 IN A 172.217.23.174
;; Query time: 150 msec
;; SERVER: 10.0.0.138#53(10.0.0.138)
;; WHEN: Fri Feb 22 18:03:53 STD 2019
;; MSG SIZE rcvd: 33
现在，这个IP似乎属于Google，http://172.217.23.174/实际上重定向到 …