The most likely source of this information is your browser’s WebRTC implementation.
You can see this in the source code of ip-api.com.
detect internal IP of a user
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Monthly Archives: October 2016
Find out which Yum package provides a command/utility
$ yum provides ‘nslookup’
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: cosmos.illinois.edu
* extras: centos.mirrors.tds.net
* updates: cosmos.illinois.edu