OSINT Tools for Infosec Investigations
OSINT, short for Open Source Intelligence, is any information/data that can be found using free available sources for the purpose of investigation. If you are familiar with the term then you will likely already know the value of that skillset. If you have never heard the term then I highly recommend learning what you can about it and getting familiar. There are a lot of resources available in the Free Resources section of my website. Just look under the "Digital Forensics/Investigations/OSINT" drop down. If you are willing to spend some money I would recommend the Open Source Intelligence Techniques book by Michael Bazzell or the Open-Source Intelligence Fundamentals course by TCM Security.
Below is a small collection of tools that can be used as a starting place in an investigation. You can get a lot of information about IP addresses, domains, URLs, file hashes and much more. I use many of these tools in my job and personal life. Hopefully you find something useful here as well.
I should also mention that not everything lasts forever including websites. As I went to publish this page I tested all the links and one of the tools I was going to share was just gone. The link redirected to something new and unrelated. If for whatever reason any of these links no longer go to the page described, use one of the search engines below to help you find an alternative.