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If I understand your question properly, that is what CIDR could be used for.
You give a CIDR an IP and a subnetmask or CIDR netmask/mask bits, then you ask it if a provided IP is considered valid within that block. This works perfectly for office domains.
I believe CIDR is directly implemented into Apache as well, so you can also use allow/deny overrides and CIDR notation.
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