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// Other services

Port 6549: APC 6549

Port 6549 is assigned by IANA to apc-6549 (APC 6549).

6549

How apc-6549 works

Other services
client:6549apc-6549response client:6549apc-6549response

The client sends a request to port 6549 and the apc-6549 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
Registered (1024-49151)
Category
Other services
01 Security

Is port 6549 dangerous?

We have no specific security note for port 6549. 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 6549

ServicePortTransportDescriptionReferenceUpdated
apc-6549 6549 TCP, UDP APC 6549 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 6549, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6549'      # process listening on 6549
sudo lsof -nP -i :6549

macOS

sudo lsof -nP -i :6549

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6549 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6549
netstat -ano | findstr :6549

From another machine

nmap -p 6549 -sV <host>
sudo nmap -sU -p 6549 <host>
nc -zv <host> 6549

Block it in the firewall

sudo ufw deny 6549/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6549" -Direction Inbound -LocalPort 6549 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6549 used for?

Port 6549 is assigned by IANA to apc-6549 (APC 6549).

Is port 6549 TCP or UDP?

Port 6549 is registered for TCP and UDP.

Is it safe to open port 6549?

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 6549 is open?

On Linux run "ss -ltnup 'sport = :6549'", on macOS "lsof -nP -i :6549", and on Windows "netstat -ano | findstr :6549" to see the local process. From another machine, "nmap -p 6549 <host>" shows whether it is reachable.

05 Related
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