Apple's old QuickTime TV / QuickTime Conferencing port, from products that no longer exist.
IANA holds 458 as appleqtc, "apple quick time", registered by Apple for its QuickTime conferencing and streaming products of the late 1990s. Apple's streaming work moved to RTSP on 554 and RTP, QuickTime Streaming Server was discontinued, and QuickTime itself is gone from Windows and folded into AVFoundation on macOS. Apple's current port documentation does not list 458 at all. A listener here means legacy software on an old Mac rather than anything Apple ships now.
Expose with care
Discontinued media software receiving no security updates — keep it on the LAN if it must run at all.
$ nmap -sV -p 458 TARGETSeen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.