From

From means the clients address. Each address field can consist of a IP address (and where meaningful, a netmask, separated from the IP address by a '/' sign.), a hostname, or a domainname (designated so by the leading '.'). Each address can be followed by a optional port specifier.

The port Parameter to from, to and via, accepts the keywords eq/=, neq/!=, ge/>=, le/<=, gt/>, lt/< followed by a number. A portrange can also be given as "port <start #> - <end #>", which will match all port numbers within the range <start #> and <end #>.