Port 4352PJLink

PJLink lets AV systems monitor and control networked projectors over port 4352.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 7/10
lookups: 0

also known as Projector Link

Technical Details

what runs on :4352

PJLink uses port 4352 for projector communications; control commands are typically sent over TCP as ASCII text, with commands beginning with %1 for Class 1 or %2 for Class 2 and terminated by a carriage return. A TCP connection begins with a greeting indicating whether authentication is enabled; when enabled, the client uses a challenge and an MD5-based response. Commands and responses are not encrypted. PJLink implementations may also use UDP on 4352 for discovery, while routine command exchanges use TCP.

Security Information

exposure of :4352

risk score

7/ 10risk

treat as sensitive. widely scanned and regularly exploited when reachable — restrict it to known sources.

network services averages 2.6 across 1,529 ports — this one sits 4.4 above.

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

An exposed PJLink service can reveal projector status and permit control such as powering the unit on or off or changing its input. Authentication may be disabled, and enabled authentication uses an MD5 challenge-response rather than encryption, so keep projector control on a trusted management network and restrict access with firewall rules; it should not be exposed directly to the internet.

Record

iana registry entry

port: :4352
service: PJLink
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 7/10risk
category: Network Services IoT
usage: PJLink is a standard protocol for controlling and monitoring networked projectors, commonly used by AV controllers and projector-management systems. Projectors and control systems use it for tasks such as power, input selection, and status queries.
lookups: 0rank 993
added: 2026-10-04
updated: 2026-10-04
references: IANA service name registry — port 4352

Something wrong?

This record is maintained by the engineers who use port 4352. 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 2026-10-04.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

Related Ports

all 1,529 in network services →

the 8 most looked-up other ports in network services — 1,529 ports carry that label.

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:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :4352PJLink

Technical Details

Security Information

Related Ports

Port 4352PJLink