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// Other services

Port 48: Digital Audit Daemon

Port 48 is assigned by IANA to auditd (Digital Audit Daemon).

48

How auditd works

Other services
client:48auditdresponse client:48auditdresponse

The client sends a request to port 48 and the auditd 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 48 dangerous?

We have no specific security note for port 48. 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 48

ServicePortTransportDescriptionReferenceUpdated
auditd 48 TCP, UDP Digital Audit Daemon - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 48, and is it reachable?

Linux

sudo ss -ltnup 'sport = :48'      # process listening on 48
sudo lsof -nP -i :48

macOS

sudo lsof -nP -i :48

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 48 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 48
netstat -ano | findstr :48

From another machine

nmap -p 48 -sV <host>
sudo nmap -sU -p 48 <host>
nc -zv <host> 48

Block it in the firewall

sudo ufw deny 48/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 48" -Direction Inbound -LocalPort 48 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 48 used for?

Port 48 is assigned by IANA to auditd (Digital Audit Daemon).

Is port 48 TCP or UDP?

Port 48 is registered for TCP and UDP.

Is it safe to open port 48?

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 48 is open?

On Linux run "ss -ltnup 'sport = :48'", on macOS "lsof -nP -i :48", and on Windows "netstat -ano | findstr :48" to see the local process. From another machine, "nmap -p 48 <host>" shows whether it is reachable.

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