In business environments using appropriate hardware, this is quite common and referred to as out-of-band management. Most big vendors like HP, Dell, Supermicro, etc. implement the Intelligent Platform Management Interface aka IPMI, which
is a set of computer interface specifications for an autonomous computer subsystem that provides management and monitoring capabilities independently of the host system's CPU, firmware (BIOS or UEFI) and operating system. IPMI defines a set of interfaces used by system administrators for out-of-band management of computer systems and monitoring of their operation. For example, IPMI provides a way to manage a computer that may be powered off or otherwise unresponsive by using a network connection to the hardware rather than to an operating system or login shell.
If you're going to implement this in your environment, I would highly encourage you to not make the IPMI interface(s) publicly reachable. Quite often new vulnerabilities in the protocol are being identified; the vendors normally take / need some time, to fix these, if at all. Here are some links about these issues from the US-Cert, an article by ITWORLD and an article of Rapid 7. Make sure you've got access control in place to this / these interface(s), for example via a VPN.