To organize things further, labels can be placed on the ports for each set of keys. This can be done with a label maker or can be written onto the port directly if there is space and if you have decent handwriting.
On each key ring, the end of an Ethernet plug gets attached. This can be securely tied or taped to the key ring. Different colored cables can be used to differentiate various keys and add a pop of color.
While this is not an option for everyone, someone who is looking for an extremely unique and different way to hang keys may be interested in this DIY project. Regardless, it will surely get interesting looks and comments whenever someone sees your keys or is in your house and use the RJ-45 ports mounted on the wall.