Numbers on AirPlay - Confused

does know these numbers on airplay option on ios??

 

those mean device 2nd or 7th device on network use hostname. addition of number feature of bonjour networking airplay uses see other airplay devices. what's causing on network ghosts of own devices not clearing properly. when device reconnects network or gets new ip address, see these ghosts , renames not conflict ghost device. harmless, yet annoying.

 

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