CyberHunter
Local dataset, no network
// Other services

Port 48001: Nimbus Spooler

Port 48001 is assigned by IANA to nimspooler (Nimbus Spooler).

48001

How nimspooler works

Other services
client:48001nimspoolerresponse client:48001nimspoolerresponse

The client sends a request to port 48001 and the nimspooler 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 48001 dangerous?

We have no specific security note for port 48001. 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 48001

ServicePortTransportDescriptionReferenceUpdated
nimspooler 48001 TCP, UDP Nimbus Spooler - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 48001, and is it reachable?

Linux

sudo ss -ltnup 'sport = :48001'      # process listening on 48001
sudo lsof -nP -i :48001

macOS

sudo lsof -nP -i :48001

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 48001 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 48001
netstat -ano | findstr :48001

From another machine

nmap -p 48001 -sV <host>
sudo nmap -sU -p 48001 <host>
nc -zv <host> 48001

Block it in the firewall

sudo ufw deny 48001/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 48001" -Direction Inbound -LocalPort 48001 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 48001 used for?

Port 48001 is assigned by IANA to nimspooler (Nimbus Spooler).

Is port 48001 TCP or UDP?

Port 48001 is registered for TCP and UDP.

Is it safe to open port 48001?

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 48001 is open?

On Linux run "ss -ltnup 'sport = :48001'", on macOS "lsof -nP -i :48001", and on Windows "netstat -ano | findstr :48001" to see the local process. From another machine, "nmap -p 48001 <host>" shows whether it is reachable.

05 Related
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