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What does the Lookup button do on the Hostname screen?

April 26, 2017button hostname lookup screen

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What does the Lookup button do on the Hostname screen?

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The Lookup button allows you to test if the iPhone can resolve the entered hostname into an IP address. If the hostname cannot be resolved into an IP address it could be because you have entered the hostname incorrectly or the iPhone cannot contact any DNS servers to perform the lookup.