IGRS — the Chinese home-networking standard for device discovery and resource sharing between PCs, phones and consumer electronics.
IANA registers 3880 to IGRS, Intelligent Grouping and Resource Sharing, a protocol suite developed by the IGRS Working Group from 2003. It lets information appliances, PCs, and consumer-electronics devices on one local network discover each other, group, and share resources and services — the same problem space as UPnP or DLNA. IGRS 1.0 became a Chinese national industry standard in 2005 and its parts were later published through ISO/IEC. In practice you meet it only on Chinese-market consumer devices, and only on the LAN.
Do not expose
A LAN discovery and resource-sharing protocol designed for a trusted home network; exposing it publicly advertises the device and its shared resources to the internet.
$ nc -vz TARGET 3880Seen 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.