Blocking an IP

How can I block an IP from the server?
I tried adding a rue to iptables ->
iptables -A INPUT -s xxx.xxx.xxx.xxx -j DROP
using the IP and if I check iptables -L I see the domain listed that corresponds to that IP address with drop status, however in my apache stats I constantly see 50+ connections from this IP. How is it getting through or should I block it elsewhere. It only connects to one site, but the connection is always there pulling data all day long and it creates a high server load at times.. Man I hate that IP address.

Cheers,
TR