libnss-mymachines 244.1-0ubuntu2 (amd64 binary) in ubuntu focal

 nss-mymachines is a plugin for the GNU Name Service Switch (NSS) functionality
 of the GNU C Library (glibc) providing hostname resolution for local containers
 that are registered with systemd-machined.service(8). The container names are
 resolved to IP addresses of the specific container, ordered by their scope.
 .
 Installing this package automatically adds mymachines to /etc/nsswitch.conf.