How does one find the DNS address of their website?

I hope this question is appropriate for this forum and hope it is an
easy one? When I look at my, or any domain in WHOIS I find where it is
being hosted (if any) but not what the DNS address is of the domain
The reason I am asking this question is that I wish to point many of
my distinct domains to one of my domain's and then use a CNAME to
point this to the hosting service's address.
Thank you,

in windows xp, some where i red that you can use nslookup(name_server

open command prompt type nslookup and enter
it give a subprompt then type name of the website., example...
it if there is host with that name.

P.s: Sorry, if it din't help, That's all i know.