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// Other services

Port 48128: Image Systems Network Services

Port 48128 is assigned by IANA to isnetserv (Image Systems Network Services).

48128

How isnetserv works

Other services
client:48128isnetservresponse client:48128isnetservresponse

The client sends a request to port 48128 and the isnetserv 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 48128 dangerous?

We have no specific security note for port 48128. 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 48128

ServicePortTransportDescriptionReferenceUpdated
isnetserv 48128 TCP, UDP Image Systems Network Services - 2006-05

// source: IANA service name and port number registry

03 Check it

Which program uses port 48128, and is it reachable?

Linux

sudo ss -ltnup 'sport = :48128'      # process listening on 48128
sudo lsof -nP -i :48128

macOS

sudo lsof -nP -i :48128

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 48128 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 48128
netstat -ano | findstr :48128

From another machine

nmap -p 48128 -sV <host>
sudo nmap -sU -p 48128 <host>
nc -zv <host> 48128

Block it in the firewall

sudo ufw deny 48128/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 48128" -Direction Inbound -LocalPort 48128 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 48128 used for?

Port 48128 is assigned by IANA to isnetserv (Image Systems Network Services).

Is port 48128 TCP or UDP?

Port 48128 is registered for TCP and UDP.

Is it safe to open port 48128?

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 48128 is open?

On Linux run "ss -ltnup 'sport = :48128'", on macOS "lsof -nP -i :48128", and on Windows "netstat -ano | findstr :48128" to see the local process. From another machine, "nmap -p 48128 <host>" shows whether it is reachable.

05 Related
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