A separate binary. But not, at least as everyone packages it, a separate package.

* https://packages.debian.org/jessie/amd64/systemd/filelist

* http://packages.ubuntu.com/xenial/amd64/systemd/filelist

* https://www.archlinux.org/packages/core/x86_64/systemd/files...

* http://www.portagefilelist.de/site/query/listPackageFiles/?c...

* https://apps.fedoraproject.org/packages/systemd/contents