The Require ip directive in the web servers configuration file (e.g. httpd.conf) can be used so that only certain IP addresses (or subnets) are allowed to access a particular resource. In this example, only IP address 10.14.115.25 would be permitted access .

<Directory />
  Options FollowSymLinks
  AllowOverride None
  Order deny, allow
  Deny from all
  Require all granted
  Require ip 10.14.115.25
</Directory>

In this example, any IP address within the 192.168.0.0/24 subnet would be permitted access.

<Directory />
  Options FollowSymLinks
  AllowOverride None
  Order deny, allow
  Deny from all
  Require all granted
  Require ip 192.168.0.0/24
</Directory>