Contact Frequency Rule ID lookup

Hi all,
I distributed a survey, and a couple entries were "skipped" with an entry in the column "contact frequency rule id" like CFR_3IPDXb6UJ6bKgMw
How can I find out which frequency rule that is?
I tried with the "inspect" in the browser on the contact frequency rule list, as that is the "trick" to find e.g. ID's of library messages, but the frequency rule id's don't seem to be there either...