No email server SHOULD allow IP addresses in the From address, and certainly no modern ones are configured this way out of the box, but there might be a system out there somewhere that allows numeric FROM addresses - especially in “hobby shop” or local-use-only mail servers. It would have to be in a place where they turned of the MX check.
I agree that it’s wrong and the sysadmin should be beaten with a cat-6 cable, but it’s still possible to set one up. Since I don’t administer all of the systems out there, I was reticent to say “No”.
Having said that, I agree that it’s dangerous as HECK to allow numeric addresses in a From address.