Blizzard's Battle.net chat/game protocol — an outbound port your games use, not something that listens on your machine.
IANA registers 1119 as bnetgame, "Battle.net Chat/Game Protocol". Blizzard's client stack uses it for the Battle.net connection behind titles like World of Warcraft, StarCraft II, Diablo III and Overwatch, which is why home firewall and router guides list TCP 1119 as one of the outbound ports to permit. On a desktop this is a connection going out to Blizzard's servers; a host listening on 1119 is not a Blizzard client and should be identified.
Fine to expose
Allowing outbound TCP 1119 is normal for a machine that plays Blizzard games. Nothing on a home or server network should be accepting inbound connections on it.
$ sudo lsof -nP -iTCP:1119Seen 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.