Technitium DNS Server v15.1.0 has been released... with support for OIDC! Now you can use your preferred identity provider to log in to Technitium accounts, and manage your DHCP/DNS deployments with approriately granular permissions controls.
I didn't understand the conection between DHCP/DNS server and login with an IDP. Had to look it up: That server has a web UI and you can use an identity provider to authenticate users, instead of local user management I guess.
Technitium DNS is advertised as a Pihole alternative.
Technitium? Indian company. One guy? Has a blog with some interesting entries. Products: a p2p messenger and a DNS resolver.