Custom stream target: only Domains and no IPs allowed?

Hi,

I´m trying to set up a custom stream target in the “transcoder / outputs and targets” section.
Unfortunately my stream target has only a IP address and no Domain which occurs in an error:

Enter the web address of the target URL, without the prefix or trailing slash
This hostname cannot be resolved.

Is it really only possible to stream to a domain and not to an IP?
Is there a workaround if yes?

thanks in advance