Custom Hosts file with IP range?

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As mentioned in the Wireshark man page, you can use the subnets file:

Name Resolution (subnets)

If an IPv4 address cannot be translated via name resolution (no exact match is found) then a partial match is attempted via the subnets file. Both the global subnets file and personal subnets files are used if they exist.

Each line of this file consists of an IPv4 address, a subnet mask length separated only by a / and a name separated by whitespace. While the address must be a full IPv4 address, any values beyond the mask length are subsequently ignored.

An example is:

# Comments must be prepended by the # sign! 192.168.0.0/24 ws_test_network

A partially matched name will be printed as "subnet-name.remaining-address". For example, "192.168.0.1" under the subnet above would be printed as "ws_test_network.1"; if the mask length above had been 16 rather than 24, the printed address would be ``ws_test_network.0.1".