Find your UDID of iPhone, iPad or Mac by single tap without iTunes
Open the site appforshare.io in Safari on your iPhone, iPad or Mac
Open the site appforshare.io in Safari on your iPhone, iPad or Mac
To get UDID tap the button when viewing site on your iPad or iPhone
Accept installation of the OTA certificate
Then it will show you iPhone UDID or iPad UDID, Product, and Version of your iPhone/iPad