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I've gotten lists where addresses that should not be assigned are present (source only addresses, reserved blocks, etc). Considering implementing a feature in my next dev work on this where it will identify known reserved blocks / addresses that should not be assigned, flag them in the output, and provide a breakdown of count with them included and without them included.

Examples of reserved blocks to include:
0.0.0.0/8 (reserved for source only; should never be used as an assignment)
192.0.2.0/24 (reserved for documentation; should never be assigned)
127.0.0.0/8 (loopbacks)
255.255.255.255/32 (broadcast address)

And more as defined by IETF.

Right now there is no IPv6 support. This is an open task to implement.

Currently ipCounter does not handle shorthand IP formats. IPv4 won't be too difficult to add; I need to reformat my dev box, so I'm opening this so I don't forget.

Examples of shorthand:

1 --> 0.0.0.1 (this isn't actually an assignable address, as per the RFC 0.0.0.0/8 is reserved for source addresses. Debating inclusion due to other enhancement: #2
1.1 --> 1.0.0.1
1.1.1 --> 1.1.0.1