Then modify your dns server to reply with that ip when queried, or use a router that will perform dns. I use MikroTik routers, and they allow you to use a static dns assignment. I would use this in my router, and assign the router as my dns server.
/ip dns static
add name=hostname.com address=192.168.1.66
If you plan on using a web browser, it requires a FQDN to access the server. Note the addition of a primary domain name above. That is the ".com" part.