domain name system - DNS resolve to CNAME which is not my website. Can someone explain?

I have a website at www.grokit.ca hosted on google app
engine. If I issue the following
command:

nslookup -query=any -debug
www.grokit.ca

... I get
the following output:

$ nslookup
            -query=any -debug www.grokit.ca
Server: X.Y.Z.12
Address:
            X.Y.Z.12#53

------------
 QUESTIONS:

            www.grokit.ca, type = ANY, class = IN

 ANSWERS:
 ->
            www.grokit.ca
 canonical name = ghs.googlehosted.com.
 ttl =
            400
 AUTHORITY RECORDS:
 ADDITIONAL
            RECORDS:
------------
Non-authoritative
            answer:
www.grokit.ca canonical name =
            ghs.googlehosted.com.

Same
with dig: dig
www.grokit.ca:

;
            <<>> DiG 9.9.6 <<>> www.grokit.ca
;; global options:
            +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY,
            status: NOERROR, id: 34283
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY:
            0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:

; EDNS:
            version: 0, flags:; udp: 4000
;; QUESTION SECTION:
;www.grokit.ca.
            IN A

;; ANSWER SECTION:
www.grokit.ca. 865 IN CNAME
            ghs.googlehosted.com.
ghs.googlehosted.com. 214 IN A
            74.125.28.121

;; Query time: 55 msec
;; SERVER:
            X.Y.Z.12#53(X.Y.Z.12)

;; WHEN: Fri Dec 11 17:53:03 PST
            2015
;; MSG SIZE rcvd:
            92

So basically I get
it, my domain is CNAME (~alias), which is linked to ghs.googlehosted.com, which is at IP
address 74.125.28.121. However, if I point the browser to 74.125.28.121, this is just a
default google website:

href="https://i.stack.imgur.com/z41Hg.png" rel="nofollow noreferrer"> src="https://i.stack.imgur.com/z41Hg.png" alt="enter image description
here">
So my question is, where is the rest of the
DNS lookup? How does the browser know where to issue the GET given that
if it uses the IP resolved by DNS it will get a 404 (going to the website on a web
browser from www.grokit.ca does work).