Dedicated server IP

What is my dedicated servers IP. I’m always asked but i can never give anyone and correct answer

My internet IP is 173.67.111.97
My network IP is 192.168.1.55

Server uses port 27015

173.67.111.97:27015

how do i get my UDP port this to say 27015 everytime i put 27015 in my UDP port sections on my ded server thing i start it up an in the ip address section it changes its self to 27016 how do i make it stay to 27015 an yes i even fowarded the port 4 27015?