An Open Mobile Alliance registration for Dynamic Content Delivery over Cell Broadcast Service.
IANA registered 7278 in January 2008 as oma-dcdocbs, "OMA Dynamic Content Delivery over CBS". DCD was an Open Mobile Alliance enabler for pushing channel-based content to handsets, and this assignment covers the variant carried over the cellular Cell Broadcast Service. It belongs to operator-side mobile infrastructure of that era, not to general-purpose servers, and it is close to unseen in internet-wide scanning. If it is open on a host you administer, the listener is almost certainly something unrelated that picked the number.
Expose with care
Nothing generic runs here, so an open 7278 is an unidentified service; find the process before deciding anything about it.
$ nc -vz TARGET 7278Seen 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.