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    dns.resolve4(hostname, options?, callback): void
    Attributes
    hostname:string
    Host name to resolve.
    options:Object
    ttl:boolean
    Retrieves the Time-To-Live value (TTL) of each record. When true, the callback receives an array of { address: '1.2.3.4', ttl: 60 } objects rather than an array of strings, with the TTL expressed in seconds.
    callback:Function
    err:Error
    addresses:string[] | Object[]

    Uses the DNS protocol to resolve an IPv4 addresses (A records) for the hostname. The addresses argument passed to the callback function will contain an array of IPv4 addresses (e.g. ['74.125.79.104', '74.125.79.105', '74.125.79.106']).

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