rg</em>&#160;</td>
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          <td>)</td>
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<p>Resolve a hostname (string) into an IP address. NON-BLOCKING callback version for use with raw API!!!</p>
<p>Returns immediately with one of err_t return codes:</p><ul>
<li>ERR_OK if hostname is a valid IP address string or the host name is already in the local names table.</li>
<li>ERR_INPROGRESS enqueue a request to be sent to the DN