Port 6581Parsec Peer-to-Peer

A little-documented peer-to-peer service assigned to TCP and UDP port 6581; no common deployment is known.

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

Technical Details

what runs on :6581

Parsec Peer-to-Peer is registered on port :6581 over tcp and udp to Andreas Varga. 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 :6581

this machine

# linux
sudo ss -tulpn 'sport = :6581'

# macos / bsd
sudo lsof -nP -i :6581

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :6581

another host

nmap -sV -p T:6581 <host>
sudo nmap -sU -sV -p U:6581 <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 :6581

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 :6581 yet

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

Record

iana registry entry

port: :6581
service: Parsec Peer-to-Peer
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: The IANA entry identifies this as “Parsec Peer-to-Peer” and lists Andreas Varga as the registrant. No common product or deployment listening on this port is established.
lookups: 0rank 993
added: 2026-10-11
updated: 2026-10-11
references: IANA service name registry — port 6581

Something wrong?

This record is maintained by the engineers who use port 6581. 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

browse categories →

ports registered around :6581, by lookups.

port	service	proto	category	risk	views
:6543	Jetnet	UDP	Network Services	caution	65.3k
:6619	Odette FTPS	TCPUDPtls	Security	caution	16.0k
:6571	Windows Live FolderShare		File Transfer	caution	11.2k
:6522	Gobby Collaboration	TCP	Remote Access	caution	10.5k
:6523	Gobby Collaborative Editing	TCP	Network Services	caution	10.4k
:6566	SANE Scanner Daemon	TCP	Network Services	caution	7.3k
:6600	Music Player Daemon	TCP	Streaming	caution	7.1k
:6627	Allied Electronics NeXGen	TCPUDP	—	safe	0

risk mix of the 8 listed

safe13%
caution88%

1 of 8 encrypted

Port :6581Parsec Peer-to-Peer

Technical Details

Security Information

Related Ports

Port 6581Parsec Peer-to-Peer