For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:wekabe:dhcp/16.0/home:wekabe:dhcp.repo
zypper refresh
zypper install dhcp-server
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:wekabe:dhcp/15.6/home:wekabe:dhcp.repo
zypper refresh
zypper install dhcp-server
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:wekabe:dhcp/15.5/home:wekabe:dhcp.repo
zypper refresh
zypper install dhcp-server