On Kubuntu 16.04 and 18.04, you can insert a custom MAC Address into a certain Wifi Hotspot connection right within the NetworkManager tray. For example, if you always connected to --let's call it-- @wifi.id hotspot on the wifi.id public places, you want to connect with a custom MAC address, then this tutorial is for you. This article discusses the tactic to make you able to use MAC as an account ("seamless" service) on public wifi places. The goal is for you to not manually change MAC every time you connect to that hotspot. Just configure once, use forever. Happy connecting!

In many places or public facilities such as public library, university, airport, restaurant, and even mini market, there might be a free Wifi access so we can connect to the Internet with our laptop. Unfortunately, most of that free stuff comes with limitation for each connection (time limited or bandwidth limited). Once you reached the limit, you'll be disconnected or not be able to use the Internet. There are may workaround to cheat with that, one of them is changing MAC Address.

A Media Access Control address (MAC address) is a unique identifier assigned to network interfaces for communications on the physical network segment. MAC addresses are used for numerous network technologies and most IEEE 802 network technologies, including Ethernet. Logically, MAC addresses are used in the Media Access Control protocol sub-layer of the OSI reference model.