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Answer all the IP addresses that refer to the the given host. If a digit address is passed in aString, the result is an array containing the single passed address. If the host could not be resolved to an IP address, answer nil.
Answer a single IP address that refer to the the given host. If a digit address is passed in aString, the result is the same as using #fromString:. If the host could not be resolved to an IP address, answer nil.