The OP code did work for me though on a closed box and Net::Address::IP::Local only seems to work if there is, as the method name suggests, a public address open otherwise it's Unable to create UDP socket: No route to host.... The OP code found the right address on both my running OS X boxes, one closed, one open.

In reply to Re^2: Answer: How do I get the local internet IP address? by Your Mother
in thread How do I get the local internet IP address? by Anonymous Monk

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