Port 6817PenTBox Secure IM Protocol

TCP port 6817 is assigned to the PenTBox Secure IM Protocol, an obscure instant-messaging service.

transport: tcp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

also known as pentbox-sim

Technical Details

what runs on :6817

PenTBox Secure IM Protocol is registered on port :6817 over tcp to Alberto Ortega Llama, assigned November 2009. We don't have a technical write-up for it beyond the IANA registry entry.

In nmap's internet-wide scan data this port is never observed open, so if it's open on your network it's more likely a custom or misconfigured service than the registered one.

find what's listening on :6817

this machine

# linux
sudo ss -tlpn 'sport = :6817'

# macos / bsd
sudo lsof -nP -i :6817

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :6817

another host

nmap -sV -p T:6817 <host>

run it? the handshake, the implementations you meet in the wild and the flags that matter come from the engineers who do.

add technical details

Security Information

exposure of :6817

risk score

1/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

voice and chat averages 3.3 across 188 ports — this one sits 2.3 below.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp

every listening transport is another surface to filter at the edge

security overview

no security notes recorded for :6817 yet

known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.

Record

iana registry entry

port: :6817
service: PenTBox Secure IM Protocol
transport: TCP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Voice and Chat
usage: IANA assigns TCP/6817 to the PenTBox Secure IM Protocol, registered to Alberto Ortega Llama in 2009. It has not been observed open in the cited internet-wide scan data, and there is no basis here to describe a common deployment.
lookups: 0rank 993
added: 2026-10-11
updated: 2026-10-11
references: IANA service name registry — port 6817

Something wrong?

This record is maintained by the engineers who use port 6817. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-11.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

all 188 in voice and chat →

the 8 most looked-up other ports in voice and chat — 188 ports carry that label.

port	service	proto	category	risk	views
:9090	Openfire Admin Console	TCP	Web Services	caution	34.2k
:1513	Garena Gaming	TCPUDP	Gaming	caution	33.1k
:9091	Openfire Admin Console (SSL)	TCPtls	Web Services	caution	28.3k
:2031	Mobrien Chat	TCPUDP	Web Services	caution	27.7k
:1720	H.323 Signaling	TCP	Network Services	caution	26.5k
:6005	Camfrog Chat	TCP	Voice and Chat	caution	25.2k
:3001	Miralix Phone Monitor	TCP	Network Services	caution	21.7k
:9009	Pichat Server	TCPUDP	Network Services	caution	19.7k

risk mix of the 8 listed

caution100%

1 of 8 encrypted

Port :6817PenTBox Secure IM Protocol

Technical Details

Security Information

Related Ports

Port 6817PenTBox Secure IM Protocol