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// Other services

Port 545: appleqtcsrvr

Port 545 is assigned by IANA to appleqtcsrvr (appleqtcsrvr).

545

How appleqtcsrvr works

Other services
client:545appleqtcsrvrresponse client:545appleqtcsrvrresponse

The client sends a request to port 545 and the appleqtcsrvr service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 545 dangerous?

We have no specific security note for port 545. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 545

ServicePortTransportDescriptionReferenceUpdated
appleqtcsrvr 545 TCP, UDP appleqtcsrvr - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 545, and is it reachable?

Linux

sudo ss -ltnup 'sport = :545'      # process listening on 545
sudo lsof -nP -i :545

macOS

sudo lsof -nP -i :545

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 545 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 545
netstat -ano | findstr :545

From another machine

nmap -p 545 -sV <host>
sudo nmap -sU -p 545 <host>
nc -zv <host> 545

Block it in the firewall

sudo ufw deny 545/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 545" -Direction Inbound -LocalPort 545 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 545 used for?

Port 545 is assigned by IANA to appleqtcsrvr (appleqtcsrvr).

Is port 545 TCP or UDP?

Port 545 is registered for TCP and UDP.

Is it safe to open port 545?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 545 is open?

On Linux run "ss -ltnup 'sport = :545'", on macOS "lsof -nP -i :545", and on Windows "netstat -ano | findstr :545" to see the local process. From another machine, "nmap -p 545 <host>" shows whether it is reachable.

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