{
  "port": 2046,
  "protocol": "both",
  "service": "sdfunc (registration only)",
  "oneLiner": "The sibling of 2045's cdfunc — same blank registration, same absence of software.",
  "whatItIs": "IANA registers sdfunc on TCP and UDP 2046 with no description, assignee or reference, and it appears in Unix /etc/services as a bare name for the same reason. Nothing widely deployed listens here, and Nmap's frequency table puts it near the bottom at roughly 0.02% of hosts. There is no protocol to describe because none was ever documented.",
  "exposure": {
    "verdict": "careful",
    "note": "A listener on an undocumented port is an unknown service. Identify the process before exposing it."
  },
  "checkCommand": "sudo lsof -nP -iTCP:2046 -sTCP:LISTEN",
  "links": [
    {
      "title": "IANA Service Name and Transport Protocol Port Number Registry",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml",
      "kind": "iana"
    },
    {
      "title": "nmap-services — Nmap port frequency data",
      "url": "https://github.com/nmap/nmap/blob/master/nmap-services",
      "kind": "github"
    }
  ]
}