I don’t know about you, but practically every time my phone rings, my heart rate starts skyrocketing.

Who the hell could be calling me? What in the world do they want? And why, for the love of all things sacred, isn’t their name showing up on the screen?!

It’s that last part that’s especially unsettling. Despite all the fancy-schmancy smarts these allegedly smart devices of ours possess, we still seem to get an annoying amount of random calls from numbers we don’t know and can’t easily identify.

In fact, one of the most common questions I hear from readers is about that very issue: “How can I reverse look up a phone number—without paying for some shoddy service or using some shady-seeming app?”

My friend, I’ve never had a great answer—until now.

Unearth all sorts of little-known tech treasures with my free Cool Tools newsletter from The Intelligence. A spiffy new discovery in your inbox every Wednesday!

So here it is: The next time you need to identify an unknown number, remember a handy little off-the-beaten-path site called NumLookup​.

© Fast Company