A vendor registration (ratio-adp) with no public protocol behind it.
IANA assigns 1108 to ratio-adp on TCP and UDP. The registration is a vendor assignment with no published specification or open implementation, and Nmap sees it open on a tiny fraction of scanned hosts. Any open 1108 on your network should be traced to a process rather than read off the registry.
Expose with care
Unidentified listener: name the process first, then decide. Vendor application ports rarely have authentication worth exposing.
$ sudo lsof -nP -iTCP:1108 -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.