Sun/Oracle Service Tags agent — answers with the machine's serial number and hardware inventory.
IANA registers 6481 as servicetags, assigned to Peter Schow at Sun. The Service Tags agent shipped with Solaris and several Sun/Oracle products to support asset discovery, and it answers unauthenticated queries with system details: OS release, hostname, architecture, platform, manufacturer, serial number, hostid, RAM, and CPU counts. Nmap ships a servicetags NSE script that does exactly this over UDP 6481. Finding it open means an older Solaris or Sun-derived stack that still has the discovery listener enabled.
Do not expose
It hands out serial numbers, hostids, and a full hardware profile with no authentication — precise inventory data for an attacker planning the next step. Disable the agent or firewall it to the asset-management server.
$ nmap -sU -p 6481 --script=servicetags TARGETSeen 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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