https://learn.hashicorp.com/tutorials/consul/get-started-service-discovery?in=consul/getting-started
Either run it on port 53, or use something like dnsmasq to route specific requests (i.e. for the .consul TLD) to the consul DNS service on its standard port (8600).
dig @127.0.0.1 -p 8600 web.service.consul
Setting up consul DNS to work seamlessly via e.g. dnsmasq enables you to do things like:
curl web.service.consul
(That would return ONLY healthy instances of the 'web' service in the Consul service catalog, provided it's on a well-known port)
dig @127.0.0.1 -p 8600 web.service.consul SRV
dig @127.0.0.1 -p 8600 nginx.web.service.consul SRV dig @127.0.0.1 -p 8600 rails.service.consul SRV
You'll probably want to use jq to filter this stuff