Work interests: science communication
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IP address locations
It can be useful to know where an email is coming from, or where the server for a website is located.
If you can find the IP address (usually easy to do with most email and services and internet browsers, then you can find the nearest source of the message or page you are looking at. This can sometimes help you decide whether the message or page is reliable, legal or genuine (even if it is a nuisance), or an actual fraud or scam.
This is one way of learning more, for example, about an academic journal that you think might be a scam or "predatory online journal".
Here is one Malayasia-based service I am testing: IP2location
Neustar is a US-based and global company that gives useful background information, mainly directed at helping companies that conduct online transactions. Geolocation is one of the tools used.