They are normally fine, but they may raise flags so unless you are a network/IT admin I would not do it. One time one of my coworkers ran a network discovery to do an audit as we were troubleshooting an issue or something, I forget. It was basically an advanced port scanner, it would search for specific services then pull up the info.
While the app was running all our printers started spitting out tons of random crap. To this day I don't know if it's just a coincidence, or if it's the app that caused it, but we stopped the app to be on the safe side.
This network was a mess though, so many security issues, but the IT manager's priority was making everything user friendly, not secure.