Port 2091PRP

PRP is an IANA-assigned service using TCP and UDP port 2091.

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

Technical Details

what runs on :2091

PRP is registered on port :2091 over tcp and udp to Amir Peless. 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 :2091

this machine

# linux
sudo ss -tulpn 'sport = :2091'

# macos / bsd
sudo lsof -nP -i :2091

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :2091

another host

nmap -sV -p T:2091 <host>
sudo nmap -sU -sV -p U:2091 <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 :2091

risk score

1/ 10safe

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

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 :2091 yet

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

Record

iana registry entry

port: :2091
service: PRP
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: The IANA registry assigns the name PRP to both TCP and UDP port 2091. The assignment is registered to Amir Peless, but no product, protocol behavior, or deployment context is recorded.
lookups: 0rank 993
added: 2026-09-20
updated: 2026-09-20
references: IANA service name registry — port 2091

Something wrong?

This record is maintained by the engineers who use port 2091. 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 2026-09-20.

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

browse categories →

ports registered around :2091, by lookups.

port	service	proto	category	risk	views
:2031	Mobrien Chat	TCPUDP	Web Services	caution	27.7k
:2105	eklogin Kerberos Remote Login	TCPUDP	Security	safe	22.1k
:2083	cPanel SSL	TCPtls	Web Services	safe	20.3k
:2105	Zephyr Notification Service (hm-serv)	TCPUDP	Network Services	caution	19.0k
:2082	Infowave Mobility	TCP	Network Services	caution	17.7k
:2087	WHM SSL	TCPtls	Web Services	caution	17.7k
:2096	cPanel SSL Webmail	TCPtls	Web Services	safe	17.4k
:2053	knetd Demultiplexer	TCP	Security	safe	17.2k

risk mix of the 8 listed

safe50%
caution50%

3 of 8 encrypted

Port :2091PRP

Technical Details

Security Information

Related Ports

Port 2091PRP