10 Websites Every Bug Bounty Hunter Should Know in 2026

Bug bounty hunting is not just about finding vulnerabilities. A large part of the process involves reconnaissance, attack-surface discovery, and understanding the technologies behind a target.

In 2026, there are several websites that can make this process significantly faster. Here are 10 useful platforms that every bug bounty hunter should know, along with where they fit into the bug-hunting workflow.

1. Chaos

Link: https://chaos.projectdiscovery.io/

Chaos is a ProjectDiscovery dataset containing a large collection of DNS and subdomain information gathered from various sources.

How it helps: It can help you discover subdomains and assets that may not immediately appear through basic enumeration.

Best stage: Reconnaissance / Asset Discovery

2. URLScan.io

Link: https://urlscan.io/

URLScan allows you to investigate websites that have previously been scanned and analyze information such as domains, IP addresses, technologies, requests, JavaScript files, and external services.

How it helps: It can reveal interesting infrastructure and resources connected to a target that you might otherwise overlook.

Best stage: Reconnaissance / Attack-Surface Mapping

3. crt.sh

Link: https://crt.sh/

crt.sh provides access to Certificate Transparency logs. Searching for an organization's domain can reveal certificates issued for related hostnames.

How it helps: It is particularly useful for discovering subdomains and identifying additional assets associated with a target.

Best stage: Subdomain Enumeration / Reconnaissance

4. Wayback Machine

Link: https://web.archive.org/

The Wayback Machine archives historical versions of websites.

How it helps: Old pages can contain references to deprecated endpoints, old functionality, JavaScript files, APIs, or technologies that are no longer visible on the current website.

Best stage: Historical Recon / Endpoint Discovery

5. Shodan

Link: https://www.shodan.io/

Shodan indexes internet-facing devices and services, allowing researchers to search for hosts, ports, services, banners, and technologies.

How it helps: It can help you understand an organization's external infrastructure and identify potentially interesting internet-facing services.

Best stage: Infrastructure Reconnaissance

6. Censys

Link: https://search.censys.io/

Censys provides visibility into internet-connected hosts, services, certificates, and infrastructure.

How it helps: It can complement traditional subdomain enumeration by helping researchers identify infrastructure associated with an organization.

Best stage: Infrastructure Discovery / Attack-Surface Mapping

7. NerdyData

Link: https://www.nerdydata.com/

NerdyData lets you search the source code of websites across the internet.

How it helps: You can search for specific code snippets, technologies, third-party services, or patterns and identify websites using them.

Best stage: Technology Discovery / Reconnaissance

8. Intelligence X

Link: https://intelx.io/

Intelligence X is an OSINT platform designed to search and analyze information from a wide range of sources.

How it helps: It can provide additional intelligence about domains, infrastructure, and historical information that can complement your normal reconnaissance process.

Best stage: OSINT / Reconnaissance

9. disclose.io

Link: https://directory.disclose.io/

disclose.io maintains a directory of vulnerability disclosure programs, bug bounty platforms, and security programs.

How it helps: If you're looking for legitimate programs to participate in, this directory can help you discover programs beyond the platforms you already know.

Best stage: Program Discovery / Before Testing

10. ProjectDiscovery

Link: https://projectdiscovery.io/

ProjectDiscovery provides a collection of security and reconnaissance tools, including tools such as Subfinder, HTTPx, Katana, Naabu, and Nuclei.

How it helps: These tools can be combined into automated reconnaissance workflows for discovering assets, identifying live hosts, crawling applications, scanning services, and detecting known vulnerability patterns.

Best stage: Reconnaissance → Enumeration → Scanning

Conclusion

Bug bounty hunting is a process, and good reconnaissance can often make the difference between overlooking an attack surface and finding something interesting.

These websites can help with different stages of the workflow — from discovering subdomains and infrastructure to analyzing historical data and finding legitimate bug bounty programs.

However, tools are only as useful as the methodology behind them. Always understand what you are testing, stay within the program's scope, and validate your findings manually before reporting them.

The goal isn't to use every tool on every target. Instead, build a workflow where the right tool answers the right question at the right stage of your hunt.