IPV4 followed by colon and port number are getting recognized as IPV6

IPV4 addresses followed by a colon and port number are recognized as IPV6 addresses.
For eg:
var ip = require("ip")
var newAdd = '198.0.3.126:8043';
if(ip.isV4Format(newAdd)){
console.log('v4');
}
if(ip.isV6Format(newAdd)) {
console.log('v6');
}
OUTPUT:
v6

Start by running the Node.js reproduction from the issue and inspect the isV4Format and isV6Format entry points. The work is done when an IPv4 address followed by a colon and port is no longer recognized as IPv6, with coverage for the reported example.

Written by the indexing model from the issue text.