• Windows :
  You may need the bonjour protocol installed on your machine, you can download from here and/or use a dedicated browser like Bonjour browser for Windows

• OSX :
  It is supported out of the box but need to use some application like discovery-dns-sd-browser
  search for esp3d

• Linux:
  Avahi service must be installed, check this wiki

• Android:
  mdDNS Discovery

search for esp3d