Install rbldnsd by entering the following commands in the terminal:
sudo apt update sudo apt install rbldnsd
Description:
small nameserver daemon designed for DNSBLs
rbldnsd is a small authoritative-only DNS nameserver designed to serve DNS-based blocklists (DNSBLs). It may handle IP-based and name-based blocklists.
Version: 0.998b~pre1-1
Section: universe/net