Man pages matching name io::socket::multicast in section 3pm:

IO::Socket::Multicast.3pm.en	debian 10 / libio-socket-multicast-perl
IO::Socket::Multicast.3pm.en	debian 11 / libio-socket-multicast-perl
IO::Socket::Multicast.3pm.en	debian 12 / libio-socket-multicast-perl