If you are getting notifications from IntranetLookup, then your Mac is infected with adware. IntranetLookup is adware for Mac.
IntranetLookup changes setting in your Mac. First, IntranetLookup installs a browser extension in your browser. Then, after IntranetLookup hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.