Generic blacklist
The Generic Blacklist type is not associated with any particular network firewall, but implements a common format readable by most of them: a list of IPs/subnets, one per line.
IP Tables
The IP Tables type provides two feeds (one for IPv4 and one for IPv6, if present), compatible with ipset.
Oplon Firewall
NGINX Blacklist
The NGINX Blacklist type provides a feed compatible with NGINX that contains a series of directives to handle incoming traffic.