CyberHunter
Local dataset, no network
// Other services

Port 1917: nOAgent

Port 1917 is assigned by IANA to noagent (nOAgent).

1917

How noagent works

Other services
client:1917noagentresponse client:1917noagentresponse

The client sends a request to port 1917 and the noagent 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 1917 dangerous?

We have no specific security note for port 1917. 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 1917

ServicePortTransportDescriptionReferenceUpdated
noagent 1917 TCP, UDP nOAgent - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1917, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1917'      # process listening on 1917
sudo lsof -nP -i :1917

macOS

sudo lsof -nP -i :1917

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1917 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1917
netstat -ano | findstr :1917

From another machine

nmap -p 1917 -sV <host>
sudo nmap -sU -p 1917 <host>
nc -zv <host> 1917

Block it in the firewall

sudo ufw deny 1917/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1917" -Direction Inbound -LocalPort 1917 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1917 used for?

Port 1917 is assigned by IANA to noagent (nOAgent).

Is port 1917 TCP or UDP?

Port 1917 is registered for TCP and UDP.

Is it safe to open port 1917?

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 1917 is open?

On Linux run "ss -ltnup 'sport = :1917'", on macOS "lsof -nP -i :1917", and on Windows "netstat -ano | findstr :1917" to see the local process. From another machine, "nmap -p 1917 <host>" shows whether it is reachable.

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