A duplicate of the (now-approved) Networking 101/5: Access Control using a Wildcard mask - I suggest to retire this Kata. If desired, translations can be submitted to the other Kata to make it available in C#, Go and JavaScript (or other languages for that matter).

For subnet with netmask 255.255.255.0, there are 254 valid hosts, not 253 as the description suggests. E.g. in a subnet with network address / netmask 192.168.1.0/255.255.255.0, valid addresses range from 192.168.1.0 through 192.168.1.255 (256 addresses), where 192.168.1.0 is reserved for the subnet itself and 192.168.1.255 is reserved as the broadcast address, hence the number of remaining addresses = 256 - 2 = 254.

startAdress should be startAddress.

( JS, possibly others )

Random tests are there, but value ranges are a bit limited. Please make the network start address and the netmask random also.

Please follow C# naming conventions:

• Namespace should be in PascalCase. Also using Main as namespace is kind of a bad idea (for obvious reasons)
• Method parameter should be in camelCase

The kata doesn't explain any of the terminologies used in the description, or how is the result determined. Why is 192.168.1.22 true, and why is 192.168.2.5 false? We should not be doing the kata author's job of researching network protocol jargon just to understand the task.

No random tests.