According to this "For options taking a Client parameter, Client can specify a hostname, a dotted IP address, a network name, or a subnet designator. A subnet designator is of the form @host/mask, where host is either a hostname or a dotted IP address and mask specifies the number of bits to use when checking access. If mask is not specified, a full mask is used. For example, the designator @client.group.company.com/16 will match all Clients on the company.com subnet. A designator of @client.group.company.com/24 will match only the Clients on the group.company.com subnet.
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