Unless you have Comcast or Mediacom. They have you on a DHCP WAN IP. My IP changed roughly every month for a while. Had to upgrade to fiber and specifically pay for a dedicated WAN IP.

These were a deal I got some years ago on Amazon. I paid maybe $200 each but they didn’t come with hard drives or a backup power supply. I’ve been adding parts to them every paycheck since.

HP Proliant DL360 G7