Port 4455PR Chat User

TCP/UDP 4455 is assigned to the PR Chat user service, with no established common implementation or observed scan presence.

inVoice and Chat

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

Technical Details

what runs on :4455

PR Chat User is registered on port :4455 over tcp and udp. 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 :4455

this machine

# linux
sudo ss -tulpn 'sport = :4455'

# macos / bsd
sudo lsof -nP -i :4455

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :4455

another host

nmap -sV -p T:4455 <host>
sudo nmap -sU -sV -p U:4455 <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 :4455

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 3.4 across 177 ports — this one sits 2.4 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 · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

no security notes recorded for :4455 yet

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

Record

iana registry entry

port: :4455
service: PR Chat User
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Voice and Chat
usage: The assignment identifies a “PR Chat User” service, but no registrant is recorded. It has not been observed open in the cited nmap scan data, and no common deployment is established.
lookups: 0rank 993
added: 2026-10-05
updated: 2026-10-05
references: IANA service name registry — port 4455

Something wrong?

This record is maintained by the engineers who use port 4455. 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 2026-10-05.

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 177 in voice and chat →

the 8 most looked-up other ports in voice and chat — 177 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 :4455PR Chat User

Technical Details

Security Information

Related Ports

Port 4455PR Chat User