We handle feeds in a stateless fashion — the domains listed in the latest pulled or pushed version of your feed(s) are the ones we block, everything before that is discarded.
Our infrastructure can very rapidly enact changes to feeds on dns0.eu. We can check and apply changes as often as every minute when pulling, and instantly when pushing.
Feeds are fetched and processed securely and only deployed to our DNS nodes in the form of hashes. They are never to be used for anything else.
We do not alter feeds — all domains included in the latest version of your feed(s) are blocked.
We prefer using the format and delivery method that you use most often with your customers or partners, as it is usually the one best monitored and less prone to failures.