The Hostname is fetched from whereever brstart is started and when domain is registered on the broker, the broker makes a OS call for name resolution by default.
If we want to change it, we need to edit the DNS or hosts file from the machine where the brstart started from.
The Hosts file will be located at /etc/hosts for UNIX OS machines and systemroot(C:\WINNT)\system32\drivers\etc for Windows OS.