All of them:
“Machine activation reset can now be requested from within iLok License Manager in version 5.5 or higher (publisher approval required). PACE keeps you notified via email each time a company resets your license(s). Just go to a computer with iLok Manager on it, log in, and your dead system will show up with its location ID and all locally-stored licenses listed. In iLok Manager, on the dead device in the device list on the left hand side, right click and choose "Report as unusable". It asks you to write a note that the vendors see for the reason for the request, then basically it automates asking for an authorisation reset from the vendors, to save you have to contact them each independently. While it's in progress, you see "Reset requested" in the Activation Status column for each affected license.
From the instructions, if all the requests get granted by each vendor, then the whole defunct machine gets removed from the iLok manager as if it never existed, and you get the activations returned to your account.”