Apache Reference: mod_access

mod_access - Host- and Network-Based Access Control
Since Apache 1.0, src/modules/standard/mod_access.c
Rob McCool (1995)

mod_access, as its name clearly implies, provides access control for documents. It allows one to restrict or allow access to resources based on the client's host name, IP address, or network address. This module servers as Apache's basic access control mechanism.

Directives:

Allow	Deny
Order