This only requires the .htaccess file. There are two approaches to restricting by IP address:

a) deny everyone access, then allow certain hosts/IP addresses

AuthName "Lee's Secret Area"
AuthType Basic
<Limit GET POST>
order deny,allow
deny from all
allow from 199.166.210.
allow from .golden.net
allow from proxy.aol.com
allow from fish.wiretap.net
</Limit>

b) allow everyone except for certain hosts/IP addresses

AuthName "Lee's Secret Area"
AuthType Basic
<Limit GET POST>
order allow,deny
allow from all
deny from .microsoft.com
deny from .evil-hackers.org
deny from 24.112.106.235
deny from morphine.wiretap.net
</Limit>