| Name | Link | Description |
| HTB (Hack The Box) Academy | https://academy.hackthebox.com/ | Educational site with several modules of varied knowledge level. Some of the more advanced modules are behind a paywall. |
| VirusTotal | https://www.virustotal.com/gui/home/upload | Analyzes files and URLs for a large variety of security issues. |
| WhoIs | https://who.is/ | Searches and provides information of IPs and domains. |
| Traceroute | https://tools.keycdn.com/traceroute | Traces communication route by IP or hostname. Useful for identifying packet loss in different target locations. |
| NetworkChuck | https://www.youtube.com/c/networkchuck | Great Youtuber covering many topics, especially network security and penetration testing. |
| NIST Information Technology Lab | https://www.nist.gov/itl | National Institute of Standards and Technology industry standards for information technology. |
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