Port 5309J Printer

J Printer is the IANA-registered name for a printer service on TCP and UDP port 5309.

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

Technical Details

what runs on :5309

no technical write-up for :5309 yet

the handshake, the implementations you meet in the wild, the flags that matter. we have the registry entry — the detail comes from the engineers who run it.

add technical details

Security Information

exposure of :5309

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 :5309 yet

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

Record

iana registry entry

port: :5309
service: J Printer
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: TCP and UDP port 5309 is assigned by IANA to a service named J Printer. The assignment is registered to Ken Blackwell, but no public protocol or deployment details are recorded here.
lookups: 0rank 994
added: 2026-09-06
updated: 2026-09-06
references: IANA service name registry — port 5309

Something wrong?

This record is maintained by the engineers who use port 5309. 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 2026-09-06.

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 :5309, by lookups.

port	service	proto	category	risk	views
:5351	NAT-PMP	TCPUDP	Security	caution	19.6k
:5357	WSDAPI	TCPUDP	Web Services	caution	19.2k
:5247	CAPWAP Data	UDP	Network Services	caution	17.9k
:5353	Multicast DNS	UDP	Network Services	safe	13.4k
:5246	CAPWAP Control	UDP	Network Services	caution	13.2k
:5269	XMPP Server Connection	TCP	Network Services	caution	12.8k
:5355	LLMNR	TCPUDP	Security	caution	10.8k
:5298	XMPP Link-Local / Serverless Messaging	TCPUDP	Network Services	caution	9.5k

risk mix of the 8 listed

safe13%
caution88%

0 of 8 encrypted

Port :5309J Printer

Technical Details

Security Information

Related Ports

Port 5309J Printer