Data Breach Lookup Website

Have I Been Pwned

Have I Been Pwned is a security website where people check whether email addresses, phone numbers, passwords, or domains appear in known data breaches, pastes, stealer logs, or exposed credential datasets.

Official site

haveibeenpwned.com is the main public website for Have I Been Pwned.

Creator

The official About page identifies Troy Hunt as the creator of Have I Been Pwned.

Core use

Users search for accounts, passwords, domains, or breach records to understand whether exposed data may require password changes, alerts, or account-hardening steps.

Have I Been Pwned helps people check whether personal data has appeared in known breaches and exposed credential datasets.View logo on Wikimedia Commons

What Have I Been Pwned is

Have I Been Pwned official site is a data breach lookup website. It lets people check whether an email address, phone number, password, or domain appears in breach-related datasets that have been loaded into the service.

Account breach search

The main search experience answers a practical question: has this account identifier appeared in a known breach? A result does not automatically mean someone is currently inside the account, but it does mean the user should review the listed incident, change reused passwords, turn on stronger authentication, and watch for follow-on abuse such as phishing.

Pwned Passwords

Pwned Passwords is the part of HIBP focused on passwords that have appeared in data breaches. The site explains that password checks use k-anonymity so a full password, or a full password hash, does not need to be sent to the service. This makes the feature useful for users, password managers, and developers who want to block or warn about already-exposed passwords.

Breach catalog

HIBP also publishes a breached-sites catalog. Each breach entry can summarize what happened, when the incident occurred or was added, and which data classes were exposed. That context matters because an email-only exposure, a password exposure, and a full identity-data exposure require different levels of follow-up.

APIs and integrations

The API documentation describes REST endpoints for breach, paste, domain, stealer log, and password workflows. Developers use these interfaces to add breach monitoring, password screening, and organizational domain checks to security tools, account systems, and password managers.

Who uses HIBP

HIBP is used by everyday internet users, security teams, domain owners, help desks, journalists, researchers, developers, and password-manager vendors. A consumer might check a personal email address, while an organization might monitor verified domains so it can respond when employee addresses appear in new breach data.

Important limits

HIBP is a warning and lookup service, not a complete identity-protection system. It cannot prove that an account is safe, list every breach that has ever occurred, or remove exposed data from the internet. Its most useful role is to turn breach awareness into action: unique passwords, password managers, multi-factor authentication, account recovery review, and phishing caution.

Why it matters

Data breaches turn old usernames, emails, phone numbers, and passwords into raw material for credential stuffing and targeted scams. Have I Been Pwned matters because it gives people and organizations a plain-language signal that their data has appeared somewhere it should not have, making it easier to respond before attackers reuse the information.

WHOIS domain data

Data pulled: May 23, 2026View current WHOIS record

Domain: haveibeenpwned.com
IP address: 104.16.123.33
Registrar: 1API GmbH
WHOIS server: whois.1api.net
Referral URL: http://www.1api.net
Created: November 13, 2013
Updated: November 23, 2025
Expires: November 13, 2026
Nameservers: rob.ns.cloudflare.com (108.162.193.140); leah.ns.cloudflare.com (173.245.58.129)
Domain status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Contact privacy: Registrant contact details are redacted for privacy; the record lists Queensland, AU as the registrant location.

Key concepts

Data breachan incident where data is accessed, copied, leaked, or published without authorization.
Pwned accountan account identifier that appears in breach data loaded into HIBP.
Pwned Passwordsa separate password-checking service for passwords seen in breaches.
K-anonymitya privacy-preserving lookup pattern that lets a user check part of a password hash without revealing the whole secret.

Website features

Search account identifiers to see whether they appear in known breach records.
Check passwords against exposed password datasets without sending the full password to the service.
Browse breach entries and review the kinds of data exposed in each incident.
Use APIs and domain monitoring workflows for organizational security and developer integrations.

Common misconceptions

A breach result does not always mean the account is currently hacked; it means data linked to that account appeared in a breach dataset.
No result is not proof that an account is safe, because not every breach is public, known, or loaded into HIBP.
Searching a password in Pwned Passwords is designed differently from sending a plain password to a normal website form.
HIBP helps detect exposure, but users still need to change reused passwords and enable stronger account protections.

Open questions

How can breach-notification services warn people quickly while avoiding panic and oversharing sensitive breach details?
What should websites do by default when a user's password appears in a known exposed-password dataset?
How can organizations monitor employee exposure without creating privacy risks for workers?
How will stealer logs, passkeys, and passwordless sign-in change the role of breach lookup services?