Use only IP-number and skip web domain name?

I have a Mac Mini Server and I am about to order an external firewall device. The firewall will be used with vpn to get access to the server from the internet. Access to the server will only be for my colleages . The server should not be accessible for other people at all (e.g., no public website, etc).
Here comes my newbie question…is it possible to only use my static public IP number to get access to the server through vpn? Do I really need a a web domain name?
Do I really need to get dns involved on the outside?
At the moment I am using my servers Wiki and blog by typing in the IP-number in the browsers address field. It would be fine with with me to continue with that.

is it possible to only use my static public IP number to get access to the server through vpn? Do I really need a a web domain name?
Sure. if you can remember your IP address you can use that anywhere. DNS exists because there are literally millions of IP addresses out there and human brains are better at remembering words (e.g. 'discussions.apple.com') than they are numbers (e.g. '64.212.100.59').
Do I really need to get dns involved on the outside?
Since it's only you and your colleagues, not at all.
At the moment I am using my servers Wiki and blog by typing in the IP-number in the browsers address field. It would be fine with with me to continue with that.
It's also not hard to setup a local DNS for your internal systems - once you're connected to VPN you'd automatically start using the internal DNS server and would be able to use memorable names, but it's entirely your choice.

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