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// Other services

Port 3948: Anton Paar Device Administration Protocol

Port 3948 is assigned by IANA to apdap (Anton Paar Device Administration Protocol).

3948

How apdap works

Other services
client:3948apdapresponse client:3948apdapresponse

The client sends a request to port 3948 and the apdap 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 3948 dangerous?

We have no specific security note for port 3948. 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 3948

ServicePortTransportDescriptionReferenceUpdated
apdap 3948 TCP, UDP Anton Paar Device Administration Protocol - 2004-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 3948, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3948'      # process listening on 3948
sudo lsof -nP -i :3948

macOS

sudo lsof -nP -i :3948

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3948 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3948
netstat -ano | findstr :3948

From another machine

nmap -p 3948 -sV <host>
sudo nmap -sU -p 3948 <host>
nc -zv <host> 3948

Block it in the firewall

sudo ufw deny 3948/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3948" -Direction Inbound -LocalPort 3948 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3948 used for?

Port 3948 is assigned by IANA to apdap (Anton Paar Device Administration Protocol).

Is port 3948 TCP or UDP?

Port 3948 is registered for TCP and UDP.

Is it safe to open port 3948?

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 3948 is open?

On Linux run "ss -ltnup 'sport = :3948'", on macOS "lsof -nP -i :3948", and on Windows "netstat -ano | findstr :3948" to see the local process. From another machine, "nmap -p 3948 <host>" shows whether it is reachable.

05 Related
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