evilbit@evilbit01 ~ $ nslookup youtube.com
Server: 216.87.64.2
Address: 216.87.64.2#53
Non-authoritative answer:
Name: youtube.com
Address: 74.125.95.93
Name: youtube.com
Address: 74.125.127.93
config
access-list 102 deny ip host 192.168.0.12 host 74.125.95.93
access-list 102 deny ip host 192.168.0.12 host 74.125.127.93
access-list 102 permit ip any any
interface FastEthernet0/0
ip access-group 102 in
Note, DNS results might be different based on geographical location, so ensure that you check to ensure the IP addresses are the same, if not, update accordingly.
Billy