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// Other services

Port 6548: APC 6548

Port 6548 is assigned by IANA to apc-6548 (APC 6548).

6548

How apc-6548 works

Other services
client:6548apc-6548response client:6548apc-6548response

The client sends a request to port 6548 and the apc-6548 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 6548 dangerous?

We have no specific security note for port 6548. 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 6548

ServicePortTransportDescriptionReferenceUpdated
apc-6548 6548 TCP, UDP APC 6548 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 6548, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6548'      # process listening on 6548
sudo lsof -nP -i :6548

macOS

sudo lsof -nP -i :6548

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6548 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6548
netstat -ano | findstr :6548

From another machine

nmap -p 6548 -sV <host>
sudo nmap -sU -p 6548 <host>
nc -zv <host> 6548

Block it in the firewall

sudo ufw deny 6548/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6548" -Direction Inbound -LocalPort 6548 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6548 used for?

Port 6548 is assigned by IANA to apc-6548 (APC 6548).

Is port 6548 TCP or UDP?

Port 6548 is registered for TCP and UDP.

Is it safe to open port 6548?

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 6548 is open?

On Linux run "ss -ltnup 'sport = :6548'", on macOS "lsof -nP -i :6548", and on Windows "netstat -ano | findstr :6548" to see the local process. From another machine, "nmap -p 6548 <host>" shows whether it is reachable.

05 Related
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