ok so im still new to ubuntu and i use firestarter as my firewall tool and i was told that its just ufw in a gui. well anyways i noticed a connection to 174.129.241.144 using https and python, i didnt have any scripts running and my browser was closed, i read the man files for ufw and it said to do something like deny from 174.129.0.0/12 and i want to block all incoming and outgoing connections to this ip range and i was wondering how to do that, i heard of iptables that it would be able to do this but i dont know anything about it so if someone could tell me what i should learn so i can handle these kinds of situation in the future and how i can block this ip subnet that would be greatly appreciated, o also what does the /8, /12, and /16 stand for?
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