Point Domain Name
I have a domain name already, and I can add subdomains to it, so I will create a new subdomain, grafana.sbcode.net and point it to the new IP address.
After waiting some time for the record to propagate, I can then visit
http://grafana.sbcode.net:3000 instead of using the ip address of the server as the url.
Adding a domain name to your Grafana Server is optional.
To check the progress of a domain name propagation, you can use the dig command.
Purchasing A Domain
If you don't have a domain name, and your colleagues can't lend you one or even create a subdomain for you, then you can get cheap domains from Namecheap
Use the Domain Name Search Tool and try anything. The cheapest domains at the moment are the .xyz and .website domains.
Namecheap also has an advanced DNS config tool which allows you to create subdomains. The @ symbol in the image below is an alias for the main domain that is being managed.
The grafana line in the above image, is an example subdomain added for the main domain that is being managed.