Changed the webadmin port for pfSense, and can't remember what it is

So in a bone headed move, I was playing around with changing the webadmin port for pfSense, and then forgot all about it, as things got busy. Months later I need to check my pfSense box, and I can’t remember what I changed the port to.

Any quick and easy ways to find out what it might be?

I do have a backup (not entirely the most recent, but usable) if I need to go down that road.

nmap -p- pfsenseIPaddress

Thanks Tom, had to slightly tweak the syntax with nmap -Pn- pfsenseIP, but it gave me what I needed to get back in.