i am not getting nothing.
1. you're syntax is wrong. double check your syntax
2. you don't have permissions for the files
3. no file exists with the ips.
One way to check this would be to search for something obvious, like:
grep -r a /
which would search for 'a' in all files. after you get some results to show the command actually works, press ctrl-c to stop it.
If this worked, but the previous did not, no files exist with your ip. maybe create a temp file with the ip, and search again. This time, you should atleast get this one result.