CyberHunter
Local dataset, no network
// Other services

Port 1691: empire-empuma

Port 1691 is assigned by IANA to empire-empuma (empire-empuma).

1691

How empire-empuma works

Other services
client:1691empire-empumaresponse client:1691empire-empumaresponse

The client sends a request to port 1691 and the empire-empuma 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 1691 dangerous?

We have no specific security note for port 1691. 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 1691

ServicePortTransportDescriptionReferenceUpdated
empire-empuma 1691 TCP, UDP empire-empuma - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1691, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1691'      # process listening on 1691
sudo lsof -nP -i :1691

macOS

sudo lsof -nP -i :1691

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1691 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1691
netstat -ano | findstr :1691

From another machine

nmap -p 1691 -sV <host>
sudo nmap -sU -p 1691 <host>
nc -zv <host> 1691

Block it in the firewall

sudo ufw deny 1691/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1691" -Direction Inbound -LocalPort 1691 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1691 used for?

Port 1691 is assigned by IANA to empire-empuma (empire-empuma).

Is port 1691 TCP or UDP?

Port 1691 is registered for TCP and UDP.

Is it safe to open port 1691?

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 1691 is open?

On Linux run "ss -ltnup 'sport = :1691'", on macOS "lsof -nP -i :1691", and on Windows "netstat -ano | findstr :1691" to see the local process. From another machine, "nmap -p 1691 <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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