{
  "port": 3986,
  "protocol": "tcp",
  "service": "Unisys MAPPER/BIS workstation server",
  "oneLiner": "The workstation-server port of Unisys MAPPER, now sold as Business Information Server (BIS).",
  "whatItIs": "IANA registers 3986 as mapper-ws_ethd, \"MAPPER workstation server\". MAPPER is a fourth-generation language and application environment that came out of Sperry Univac in the 1970s and survives as Unisys BIS on ClearPath and Windows; this port carries workstation clients into the server. It is worth knowing that port scanners print \"mapper-ws_ethd\" for 3986 straight from the IANA name, so a scan label alone is not evidence that a Unisys mainframe environment is present.",
  "exposure": {
    "verdict": "never",
    "note": "A line-of-business application server for a mainframe-era environment: front it with a VPN rather than putting the workstation protocol on a public address."
  },
  "checkCommand": "nc -vz TARGET 3986",
  "links": [
    {
      "title": "Unisys — Business Information Server for Microsoft Windows (administration guide)",
      "url": "https://public.support.unisys.com/mapper/docs/BIS15.1/78460268-020.pdf",
      "kind": "official-docs"
    },
    {
      "title": "IANA port registry — 3986 (mapper-ws_ethd)",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=3986",
      "kind": "iana"
    }
  ],
  "ianaName": "mapper-ws_ethd"
}