Packages with the libidn2 use flag

net-dns / dnsmasq : Small forwarding DNS server

  • Enable support for Internationalized Domain Names, via net-dns/libidn2 rather than net-dns/libidn

net-dns / knot : High-performance authoritative-only DNS server

  • If IDN support is enabled, use net-dns/libidn2 instead of net-dns/libidn

sys-apps / systemd : System and service manager for Linux

  • If IDN support is enabled, use net-dns/libidn2 instead of net-dns/libidn