{
  "port": 3800,
  "protocol": "both",
  "service": "pwgpsi (Print Service Interface)",
  "oneLiner": "The Printer Working Group's Print Service Interface port, registered in 2003 and little deployed.",
  "whatItIs": "IANA assigned 3800 to pwgpsi in May 2003 on behalf of Harry Lewis of the Printer Working Group. PSI, the Print Service Interface, was a PWG effort to define how a client — a printer, mobile device, portal, or service — creates a print job on a print service and resolves the document to be printed; it reached candidate-standard form in 2005. It never displaced IPP, which is what printers actually speak on 631, so this port is a registration you will rarely see occupied.",
  "exposure": {
    "verdict": "careful",
    "note": "Print services accept documents and leak device and job metadata; keep any print interface on the internal network regardless of which port it landed on."
  },
  "checkCommand": "nmap -Pn -sV -p 3800 TARGET",
  "links": [
    {
      "title": "PWG Candidate Standard — Print Service Interface",
      "url": "https://ftp.pwg.org/pub/pwg/candidates/cs-psi10-20050225-5104.2.doc",
      "kind": "spec"
    },
    {
      "title": "IANA port registry — 3800 (pwgpsi)",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=3800",
      "kind": "iana"
    }
  ]
}