That's not a valid domain name:
$ dig good
; <<>> DiG 9.8.3-P1 <<>> good
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 65133
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;good. IN A
;; Query time: 3 msec
;; SERVER: 192.168.11.1#53(192.168.11.1)
;; WHEN: Mon Feb 19 12:13:28 2018
;; MSG SIZE rcvd: 22
I works because most browsers try to add ".com" to an invalid domain name.
And good.com is valid
$ dig good.com
; <<>> DiG 9.8.3-P1 <<>> good.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57755
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;good.com. IN A
;; ANSWER SECTION:
good.com. 19030 IN A 216.136.156.80
;; Query time: 4 msec
;; SERVER: 192.168.11.1#53(192.168.11.1)
;; WHEN: Mon Feb 19 12:14:05 2018
;; MSG SIZE rcvd: 42
And http://good.com redirects after some jumps to http://us.blackberry.com/
