loopback

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See: how to setup multi ip address on one network card for Linux /MAC MACBOOK

OS X, by default, only appears to configure 127.0.0.1 as loopback. To add others, run

sudo ifconfig lo0 alias 127.0.0.2/32 up

On Linux, this would look like

ifconfig lo:5 127.0.0.5 netmask 255.0.0.0 up