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// Other services

Port 2157: Xerox Network Document Scan Protocol

Port 2157 is assigned by IANA to xnds (Xerox Network Document Scan Protocol).

2157

How xnds works

Other services
client:2157xndsresponse client:2157xndsresponse

The client sends a request to port 2157 and the xnds 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 2157 dangerous?

We have no specific security note for port 2157. 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 2157

ServicePortTransportDescriptionReferenceUpdated
xnds 2157 TCP, UDP Xerox Network Document Scan Protocol - 2008-03-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 2157, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2157'      # process listening on 2157
sudo lsof -nP -i :2157

macOS

sudo lsof -nP -i :2157

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2157 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2157
netstat -ano | findstr :2157

From another machine

nmap -p 2157 -sV <host>
sudo nmap -sU -p 2157 <host>
nc -zv <host> 2157

Block it in the firewall

sudo ufw deny 2157/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2157" -Direction Inbound -LocalPort 2157 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2157 used for?

Port 2157 is assigned by IANA to xnds (Xerox Network Document Scan Protocol).

Is port 2157 TCP or UDP?

Port 2157 is registered for TCP and UDP.

Is it safe to open port 2157?

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 2157 is open?

On Linux run "ss -ltnup 'sport = :2157'", on macOS "lsof -nP -i :2157", and on Windows "netstat -ano | findstr :2157" to see the local process. From another machine, "nmap -p 2157 <host>" shows whether it is reachable.

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