Open the Info.plist file of the calendar you are interested in and look for:
https://pXX-caldav.icloud.com/USER_ID/principal/. (The principal URL is going to be the same for all your iCloud calendars.)
If you are interested in the iCal link (for read-only subscriptions):
open the iCal application, go to the calendars list on the left, click
on the share icon and you will get a public address to share the
calendar. You need to replace the
webcal protocol with
The URL of the calendar is then formed as follows:
(See: https://discussions.apple.com/thread/3414939?start=0&tstart=0 for a similar discussion.)
Google makes it a bit easier to find the calendars’ URLs.
The calendar URL is then formed as follows:
The calendars URLs are readily available from the web interface: you will find the calendar address by clicking on the gear at the bottom of the page when you visit a calendar. The ID of the calendar is the calendar name.
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