The NDI Directory (Discovery) Service is a service used to allow NDI devices to discover each other on a corporate network where mDNS is not allowed. It is available from the NDI SDK.
I have put this into a Docker container, which is available on [Docker Hub](https://hub.docker.com/r/radialbog9/ndi-directory-service).
By using this container you accept the [NDI SDK license agreement](https://downloads.ndi.tv/SDK/NDI_SDK/NDI%20License%20Agreement.pdf)