Port 9747L5NAS Parallel Channel

TCP and UDP 9747 are assigned to L5NAS Parallel Channel, with no widely known implementation or common public-facing use.

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

also known as l5nas-parchan

Technical Details

what runs on :9747

L5NAS Parallel Channel is registered on port :9747 over tcp and udp to Lawrence J Dickson, assigned March 2002. 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 :9747

this machine

# linux
sudo ss -tulpn 'sport = :9747'

# macos / bsd
sudo lsof -nP -i :9747

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :9747

another host

nmap -sV -p T:9747 <host>
sudo nmap -sU -sV -p U:9747 <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 :9747

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 :9747 yet

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

Record

iana registry entry

port: :9747
service: L5NAS Parallel Channel
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: The IANA registry assigns this port to L5NAS Parallel Channel and lists Lawrence J Dickson as the registrant. No widely encountered implementation is known; an open listener cannot be confidently identified from this assignment alone.
lookups: 0rank 993
added: 2026-10-16
updated: 2026-10-16
references: IANA service name registry — port 9747

Something wrong?

This record is maintained by the engineers who use port 9747. 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 2026-10-16.

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 :9747, by lookups.

port	service	proto	category	risk	views
:9800	WebCT e-learning		Web Services	caution	13.7k
:9800	WebDAV Source	TCPUDP	Web Services	caution	10.8k
:9750	Board M.I.T. Synchronous Collaboration	TCPUDP	Voice and Chat	safe	0
:9802	WebDAV Source TLS/SSL	TCPUDPtls	Web Services	safe	0
:9694	T-Mobile Client Wakeup	TCPUDP	Mobile	safe	0
:9700	Board M.I.T. Service	TCPUDP	—	safe	0
:9753	rasadv	TCPUDP	—	safe	0
:9762	WSO2 Tungsten HTTP	TCPUDP	Web Services	safe	0

risk mix of the 8 listed

safe75%
caution25%

1 of 8 encrypted

Port :9747L5NAS Parallel Channel

Technical Details

Security Information

Related Ports

Port 9747L5NAS Parallel Channel