Let’s suppose you have a list with IPs you want to block on your router, for example from http://www.ipdeny.com/ipblocks/data/countries/:
There are times in life when a core thermometer comes in handy (e.g. when brewing beer). But what happens if you don’t have any, but you do have access to an external temperature probe for IKA hotplates with a nice display?
Although the serial port in desktop PCs is on its way to die out, we still have a good chance to find one in our computer. If it doesn’t have a connector on the back panel, it’s still worth to have a look at the motherboard and look for the COM header: