Whitelist/Blacklist IP Addresses (IIS) Only allows requests from a specified set of IPs. Useful when a site is under development or maintenance.

Whitelist/Blacklist IP Addresses (Apache) Allow or deny requests based upon the requesting IP address. Useful when a site is under maintenance or to block repeat offenders.

Block Specific User-agents (Apache) Block specific User-agents' requests. Useful for dealing with malicious bots.

Block Specific User-agents (NGINX) Disallow specific User-agents' requests. Useful for dealing with malicious bots.