CyberHunter
Local dataset, no network
// Other services

Port 2611: LIONHEAD

Port 2611 is assigned by IANA to lionhead (LIONHEAD).

2611

How lionhead works

Other services
client:2611lionheadresponse client:2611lionheadresponse

The client sends a request to port 2611 and the lionhead 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 2611 dangerous?

We have no specific security note for port 2611. 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 2611

ServicePortTransportDescriptionReferenceUpdated
lionhead 2611 TCP, UDP LIONHEAD - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2611, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2611'      # process listening on 2611
sudo lsof -nP -i :2611

macOS

sudo lsof -nP -i :2611

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2611 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2611
netstat -ano | findstr :2611

From another machine

nmap -p 2611 -sV <host>
sudo nmap -sU -p 2611 <host>
nc -zv <host> 2611

Block it in the firewall

sudo ufw deny 2611/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2611" -Direction Inbound -LocalPort 2611 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2611 used for?

Port 2611 is assigned by IANA to lionhead (LIONHEAD).

Is port 2611 TCP or UDP?

Port 2611 is registered for TCP and UDP.

Is it safe to open port 2611?

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 2611 is open?

On Linux run "ss -ltnup 'sport = :2611'", on macOS "lsof -nP -i :2611", and on Windows "netstat -ano | findstr :2611" to see the local process. From another machine, "nmap -p 2611 <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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