CyberHunter
Local dataset, no network
// Other services

Port 1096: Common Name Resolution Protocol

Port 1096 is assigned by IANA to cnrprotocol (Common Name Resolution Protocol).

1096

How cnrprotocol works

Other services
client:1096cnrprotocolresponse client:1096cnrprotocolresponse

The client sends a request to port 1096 and the cnrprotocol 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 1096 dangerous?

We have no specific security note for port 1096. 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 1096

ServicePortTransportDescriptionReferenceUpdated
cnrprotocol 1096 TCP, UDP Common Name Resolution Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1096, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1096'      # process listening on 1096
sudo lsof -nP -i :1096

macOS

sudo lsof -nP -i :1096

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1096 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1096
netstat -ano | findstr :1096

From another machine

nmap -p 1096 -sV <host>
sudo nmap -sU -p 1096 <host>
nc -zv <host> 1096

Block it in the firewall

sudo ufw deny 1096/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1096" -Direction Inbound -LocalPort 1096 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1096 used for?

Port 1096 is assigned by IANA to cnrprotocol (Common Name Resolution Protocol).

Is port 1096 TCP or UDP?

Port 1096 is registered for TCP and UDP.

Is it safe to open port 1096?

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 1096 is open?

On Linux run "ss -ltnup 'sport = :1096'", on macOS "lsof -nP -i :1096", and on Windows "netstat -ano | findstr :1096" to see the local process. From another machine, "nmap -p 1096 <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

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