Thread:Extension talk:CheckUser/No matches found?

So recently I got a few spambots on my wiki, which prompted me to install CU. There were five accounts in total, they made spam pages and/or spam userpages. I blocked all five indefinitely, deleted their pages, and hid their usernames (On a side note I am now the only one who can see those usernames in the BlockList, for others the list is empty) I decided to install CU to try and get an IP range, and they're all returning "no matches found". The extension is certainly working because I tested it on myself and got my own IP address, so why did these accounts seemingly have no IP at all? A final note I should add is that after installing the extension, all the Autoblock entries on the BlockList disappeared, though the accounts names were still there.