# WHATPORT(3800)

## NAME

port 3800 — pwgpsi (Print Service Interface) — The Printer Working Group's Print Service Interface port, registered in 2003 and little deployed.

Protocol: TCP/UDP  
IANA registry

## DESCRIPTION

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

**Expose with care.** 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.

## CHECK

```sh
nmap -Pn -sV -p 3800 TARGET
```

## SEE ALSO

- spec — [PWG Candidate Standard — Print Service Interface](https://ftp.pwg.org/pub/pwg/candidates/cs-psi10-20050225-5104.2.doc) (ftp.pwg.org)
- iana — [IANA port registry — 3800 (pwgpsi)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=3800) (iana.org)

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HTML: <https://whatport.net/3800/> · JSON: <https://whatport.net/3800.json> · full dataset: <https://whatport.net/ports.json>