You can check inetd which does exactly that and comes preinstalled and pre activated with Linux installations. Or at lest it was common once upon a time. Don't

You can check inetd which does exactly that and comes preinstalled and pre activated with Linux installations. Or at lest it was common once upon a time. Don't know if it still is. https://en.wikipedia.org/wiki/Inetd https://en.wikipedia.org/wiki/Inetd