One Telegram Upload, 528 Emails: The prtnx.com Combolist Went Public

HEROIC analysts identified a targeted combolist labeled prtnx.com - 528 emails, uploaded by a Telegram user on 10 June 2026. The file contains exactly 528 records: email addresses tied to the prtnx.com domain, paired with plaintext passwords and the URLs of the login pages the credentials belong to.

Why This Is Dangerous

One Telegram upload. 528 email addresses. This is a narrow, targeted list rather than a sprawling mixed dump, and that focus is exactly what makes it useful to an attacker. A list built around a single domain lets someone target every account tied to that organization or user base at once, instead of sifting through millions of unrelated records.

What Was Exposed

• Email addresses tied to the prtnx.com domain
• Plaintext passwords
• URLs of the login pages tied to each account

Why This Matters

Because the passwords are stored in plaintext and matched to a specific site, attackers can attempt to log in immediately without guessing or cracking anything. If any of these 528 users reused their password on other accounts, banking apps, or social media, that password is now exposed everywhere it was reused, not just here.

How Combolists Work

A combolist compiles email and password pairs, often narrowed to a single domain or provider like this one, then formats them as simple lines ready to feed into automated login tools. Criminals build domain-specific lists like this by filtering larger stealer logs or breach dumps down to just the accounts tied to one target, then testing and reselling the working pairs.

Check If You Are Affected

HEROIC's free breach scanner checks your email against more than 400 billion leaked records, including small, targeted combolists like this one. Run a free search to see if your address is among the 528 exposed.