Well, you could run a DNS server on a machine somewhere (including the Confluence server), but just running a DNS server doesn't mean anyone will use it. Your ISP needs to put the DNS entries into their DNS servers for other people to pick it up.
Download and install one. A lot of people use BIND, but that's quite a heavyweight. dnsmasq is a lot lighter and easier for the basics.
However, putting a DNS server on a network can be risky if you aren't careful with it. If you're doing this on a network you don't own, you could cause problems.
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