many connections to *bz.push.apple.com

hello
see mac making lot of connections hosts ending bz.push.apple.com:

st11p01st-courier084-bz.push.apple.com
st11p01st-courier085-bz.push.apple.com
...

apple servers , process making connections ? icloud ? have icloud account i'm not logged in in preferences.

thanks,

 

looks they're imessage servers. found this thread quick search of google.

 

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