A valid host must be a string containing an IPv4 address.
The IPv4 address is formatted as {n}.{n}.{n}.{n} where n is a valid integer.
If the host is non-ephemeral then it must NOT be 0.0.0.0
A valid port must be a integer representing the port. The integer must be between 0 and 65536.
If the port is non-ephemeral then it must NOT be 0
A valid host:port must be a string containing both the host and port
The string must be formatted as {host}:{port} and must follow
the host and port rules.
If the host:port is non-ephemeral then it must NOT contain the IP
0.0.0.0 and must NOT contain the port 0