This is a frequently asked question about blocking IP addresses in Google Analytics.
Blocking a range of IP addresses
If you have a range of IP addresses that you want to block then use this RegEx in Google Analytics
Example:
216.67.94. 01 - 216.67.94.99
181.69.245.01 - 181.69.245.01
Then you can user
2161\. 67\. 94\. \d*|^181\. 69\. 245\. \d*
The | character in the middle means OR.