I cant figure out my lan world ip and my friend cant join cause it doesnt show up to join on thier computer.

When lan worlds where first added it showed all the numbers. (123.45.678.9:123456) Then minecraft updated and it said server opened to port (123456) That would be fine if the computer i was trying to connect to the lan world showed the lan world as an option to connect to. Since i dont know the first set of numbers (123.45.678.9: ) i cant join any lan worlds with my other computer. I say make lan worlds show up like they are supposed to or put the first set of numbers back in the chat how it first showed up. (The numbers i put in are examples and not my real ip because i dont know my lan ip cause minecraft wont show it.)