Fix for invalid IPv6 or IPv4 ipaddress and subnet

[anurag-ks]

Implements and closes #28

[coveralls]

Pull Request Test Coverage Report for Build 86

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 84:	0.0%
Covered Lines:	222
Relevant Lines:	222

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💛 - Coveralls