Registered as Apple's local NetInfo port — a directory service Apple removed from macOS years ago.
IANA assigns 1033 to netinfo-local, "local netinfo port", registered in 2002 by an Apple engineer. NetInfo was the directory and configuration database used by NeXTSTEP and early Mac OS X; Apple replaced it with Open Directory and dropped it entirely, so no current macOS ships a NetInfo daemon. Finding 1033 open today therefore is not NetInfo — on older Windows it is another endpoint from the pre-Vista 1025-5000 dynamic RPC range, and elsewhere it is an application that took a free low port.
Expose with care
The registered service is extinct, so an open 1033 is an unidentified listener; a directory or RPC service found here should stay on a private network.
$ sudo lsof -nP -iTCP:1033 -sTCP:LISTENSeen 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.