Zlocate is a program used by MIT's Zephyr message system. You can use it to find out where someone is logged in. However, if they wish to be hidden, it is not possible to locate them.
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In order to be locateable by the web zlocate gateway, you must set your zephyr exposure to be net-announced using the command
zctl set exposure net-visible
Note: This will make you realm-announced as well, so you will appear in the znols of people who have you in their .anyone file. For more information on exposure and other aspects of zephyr, check Inessential Zephyr.