How are PageIDs generated?

[Mya.Hauck]

We are trying to predict URLs of pages. Both the URL page title format and URL PageID format contain a page's PageID, so we figure the PageID is what we need to understand to be able to predict a URL.

How is a PageID generated? Is it possible to predict PageIDs? Are they some sort of count? Are they site unique, or are they unique to all of Atlassian?

[Nic Brough -Adaptavist-]

The IDs are unique only within the current system, and they are sequential, but they're not consecutive.  The closest you could get to predicting them is to look at the id of the very last page that was created recently, add 10 to the number (I think it's 10), round it down to the nearest 10, then your page id is likely to be that give or take 1 to 9.