CyberHunter
Local dataset, no network
// Other services

Port 165: Xerox

Port 165 is assigned by IANA to xns-courier (Xerox).

165

How xns-courier works

Other services
client:165xns-courierresponse client:165xns-courierresponse

The client sends a request to port 165 and the xns-courier 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 165 dangerous?

We have no specific security note for port 165. 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 165

ServicePortTransportDescriptionReferenceUpdated
xns-courier 165 TCP, UDP Xerox - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 165, and is it reachable?

Linux

sudo ss -ltnup 'sport = :165'      # process listening on 165
sudo lsof -nP -i :165

macOS

sudo lsof -nP -i :165

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 165 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 165
netstat -ano | findstr :165

From another machine

nmap -p 165 -sV <host>
sudo nmap -sU -p 165 <host>
nc -zv <host> 165

Block it in the firewall

sudo ufw deny 165/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 165" -Direction Inbound -LocalPort 165 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 165 used for?

Port 165 is assigned by IANA to xns-courier (Xerox).

Is port 165 TCP or UDP?

Port 165 is registered for TCP and UDP.

Is it safe to open port 165?

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 165 is open?

On Linux run "ss -ltnup 'sport = :165'", on macOS "lsof -nP -i :165", and on Windows "netstat -ano | findstr :165" to see the local process. From another machine, "nmap -p 165 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

Latest vulnerability news

All news