Secure Directories by IP Address and/or Domain - In the following example, all IP addresses are allowed access except for 12.345.67.890 and domain.com.
# Allow all except those indicated here
<Limit GET POST PUT>
order allow,deny
allow from all
deny from 12.345.67.890
deny from 12.678.90.123
deny from .*domain1\.com.*
deny from .*domain2\.com.*
</Limit>