Putting aside the question of legality, a port scan that does not have prior authorization is pretty generally considered "impolite". As an analogy, it's certainly not illegal to touch someone else's laptop screen, and if I gesture at something and accidentally land a fingerprint on someone's screen, I'll apologize. Legality notwithstanding, it's kind of a dick move if you see me do that, to walk over and tell me I don't need to apologize to the person, and then plant your own fingersmudge right there next to mine.
In any case, if you're located inside the US, it's almost certainly a violation of your ISP's terms of service.
Re:Anonabox Analysis
by Dylan16807 on Monday April 06, 2015 @05:57PM
(#9330936)
Well it's more like saying you don't have to apologize to the laptop. And with invisible smudges.
There is no need to apologize. There is nothing wrong with port scanning a public IP address. In fact, I just did it myself:
No problem at all for anyone involved.