See if a username appears in leaked data
Plenty of breaches leak a username with its password and no email beside it. Search the names you sign in with to find the records an email check misses.
- Free, five checks a day
- Masked results
- Exact name, no guessing
Where usernames leak
Forums, game servers, fan sites and older social networks often asked for nothing more than a username and a password. When those sites were breached, the username is the only thing that ties a record to you.
Gamer tags, forum handles and the name you have used since school are the ones to check. They tend to be reused across sites for years, and so do the passwords that go with them.
A record found for a username shows the breach, its date, and whether a password, a password hash or an IP address leaked with it. Addresses in the sample are masked to their first letters.
Reading a username result
Look at the breach names
If they are sites you used, at about the time given, the records are most likely yours.
Look at what leaked with them
A password or hash beside the name means any account still using that password is at risk.
Check the email too
Search the address you used on those sites on the email breach check, which can find different records.
A common name is not always you
Usernames aren’t unique across the internet. Someone else may have used the same name on a site you never joined.
Short and common names
Names like alex or gamer123 turn up in many breaches, belonging to many people. Expect a high count.
Distinctive names
A name only you use is a strong match. Records for it are very likely yours, wherever they turn up.
Masked identifiers
The first letters of the email in each record help tell your records from someone else’s.
The full records are on Seer
This site shows how many breach records hold what you searched, and a masked sample of them. The check is run by Seer, which shows the full records: which breach each came from, when, and what leaked with it.
Seer also searches stealer logs, the records malware takes from infected devices, and finds the social accounts tied to an email address, username or phone number.
Try Seer’s free check- Breached credentialsEvery record an email address, username, phone number or domain appears in.
- Stealer logsLogins captured by malware on infected devices, searchable by email, username or domain.
- Social accountsAccounts on 740+ platforms by username, 106 by email address and 20 by phone number.
- Plans and pricingWhat a free account includes, and what the paid plans add.
Questions
Why check a username for breaches?
Many breaches, especially of forums and games, leak usernames with the passwords or hashes beside them and no email at all. People reuse a username across sites, and often its password too, so one leak can open several accounts.
Does a match mean it was my account?
Not always. A common username can belong to several people on different sites. Look at the breach names and dates: if they are sites you used at that time, the record is most likely yours.
Should I search with or without the @?
Without. Type the name on its own, as in jane_doe, exactly as you spell it when you sign in.
What if the username is also my email’s first half?
Search both. A breach may have stored only one of them, so the email check and the username check can find different records.