Search 837 sites for one username.

HandleProbe opens every profile address at once and tells you which accounts exist. It takes a minute or two, and nothing is saved.

Signal map837 sites

One square per site. When you search, each fills in as its answer comes back.

01
Every site at once
Social networks, code hosts, forums, games, art and music communities. Each profile address is opened in parallel, so the whole search takes a minute or two.
02
Read, not guessed
A page loading isn't proof. Each one is scored on about 30 signals, and a match only counts once it differs from what the site shows for a username that can't exist.
03
Nothing kept
No accounts, cookies or trackers. A search and its results stay in memory for ten minutes so a dropped connection can resume, then they're deleted.

A match means an account with that username exists. It doesn’t tell you who owns it, and plenty of people share a handle.

How it works