DDoS Glossary

Blacklist / Whitelist

Blacklist and whitelist are two different yet very similar technologies that often come in tandem.

Blacklist is the ability to block an entity such as a user-based IP or an entire network range or geographical location. Whitelist is the opposite – it allows a certain entity to pass even if the other technologies have decided to take action against it. Both technologies maintain an important role in DDoS mitigation.