With idbuster you can Bruteforce Page id's like http://test.com/?page_id= You can input a range for example 1000 or 100 and than it trys all page id's from 1 to your given range.
Quick Usage:
python idbuster.py -u https://example.com/?id= -n 1000
This Example above will bruteforce all Page id's from 1 to 1000 and will return Pages with status code of [200]
If you have any issues you can write me or simply ask for help and also feel free to modify the source code and make it work better.
Have fun and of course only use it against websites you permission to do it.