Block Unwanted Visitors with .htaccess

Example .htaccess

order deny,allow
deny from all
allow from 10.231.
allow from 10.139.
allow from 1.11.22.
allow from 1.11.1.1

Block Unwanted Visitors with .htaccess using password

Example .htaccess

AuthUserFile /path/to/htpasswd/file/.htpasswd
AuthGroupFile /dev/null
AuthName "Name of Area"
AuthType Basic
require valid-user