# h4ck0r.com

> h4ck0r.com is a free, browser-based network security, reconnaissance and
> learning suite. It combines hands-on lookup tools (DNS, TLS, HTTP headers,
> ports, subnetting) with a structured curriculum on networking and web
> application security, plus a command reference for nmap, openssl and tcpdump.
> Everything runs in the browser against public data. No account, no paywall.

## Who it is for

Students, self-taught engineers and working sysadmins who want to understand
how networks and web security actually behave, rather than memorize answers.
Material is written for defenders: how a thing works, how it fails, and how to
check your own systems.

## Sections

- [Learn](https://h4ck0r.com/learn/): structured modules on network
  fundamentals, subnetting, DNS, routing, HTTP headers, TLS, and the OWASP
  categories of web application vulnerabilities.
- [Reference](https://h4ck0r.com/reference/): fast lookup tables for common
  ports, DNS record types, HTTP status codes, and the flags you actually use in
  nmap, openssl and tcpdump.
- [Notebook](https://h4ck0r.com/notebook/): field notes and write-ups.

## Scope and ethics

The tools query public information about hosts you name — DNS records,
certificates, response headers. They are for understanding and for auditing
infrastructure you are responsible for. Nothing here is an exploit kit, and the
learning material is written from a defensive standpoint.

## Publisher

Built and operated by Eric Dust (https://ericdust.com), founder of DataGuys.co
(https://dataguys.co).

## Usage

You may read these pages to answer a question, provided you cite h4ck0r.com and
link to the page you used. Please do not use this content to train or fine-tune
a model — see https://h4ck0r.com/robots.txt.