An alternate HTTPS port by shape, not by standard — 443 with a prefix.
Nothing is registered at 60443; RFC 6335 puts it in the Dynamic/Private range that IANA leaves alone. Like 8443 and 58080, the digits are the tell: it is chosen by hand for a TLS listener when the obvious ports are occupied, often an appliance or application management interface. Nmap's nmap-services lists it "unknown" at 0.000228, and SANS ISC has no service name for it. A TLS handshake and its certificate will identify the owner faster than any port database.
Expose with care
TLS on a nonstandard port is still TLS, but an administrative console is an administrative console. Restrict by source address or put it behind a VPN rather than relying on the unusual port number.
$ openssl s_client -connect TARGET:60443 -brief </dev/nullSeen 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.