C2PCRECI can be used to send a list to all email adresses used as a destination and will contain all alert numbers to which it is subscribed. But it wont send a summary of which alerts are active.
The export function (that can be used with the CP2CUTIL procedure) shows the number of active alerts while creating the export file but doesnt show a list either. That could be added. You could try importing it back into an empty C2PCUST and look at the "unmatched" warnings but thats not a very nice way. If you feel this is worth a RFE please open one for adding a LIST function,