NERD is a software and a service which acquires, stores and aggregates various data about known malicious network entities (mostly IP addresses) and provides them in a comprehensible way to users.
The main NERD instance runs at nerd.cesnet.cz.
See the project wiki for more information.
This software was developed within the scope of the Security Research Programme of the Czech Republic 2015 - 2020 (BV III / 1 VS) granted by the Ministry of the Interior of the Czech Republic under the project No. VI20162019029 The Sharing and analysis of security events in the Czech Republic.