{
  "port": 3801,
  "protocol": "both",
  "service": "ibm-mgr (IBM manager service)",
  "oneLiner": "Registered to IBM in 2006 as a manager service, with no public specification.",
  "whatItIs": "IANA lists 3801 as ibm-mgr, \"ibm manager service\", registered by Tim Hahn of IBM in March 2006. IBM never published a protocol description tied to this port, and it is not one of the ports its current systems-management documentation tells you to open. Scanners find it open only occasionally. The registration is essentially the entire verifiable story.",
  "exposure": {
    "verdict": "careful",
    "note": "If this really is a management agent, management planes belong on an internal network — confirm what is listening before allowing it through a firewall."
  },
  "checkCommand": "nmap -Pn -sV -p 3801 TARGET",
  "links": [
    {
      "title": "IANA port registry — 3801 (ibm-mgr)",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=3801",
      "kind": "iana"
    }
  ]
}