We've added the ability to manage "banned" listener IPs from the web interface. IPs can be supplied one-by-one or in CIDR-notated groups. This feature works the same on both Icecast and SHOUTcast. Banned IPs can be managed via the station profile, under the "Broadcasting" tab.
Fosstodon is an English speaking Mastodon instance that is open to anyone who is interested in technology; particularly free & open source software.