CyberHunter
LinkedIn profile - Bastien Cordier Email: contact@bastiencordier.pro
// Other services

Port 4161: OMS Contact

Port 4161 is assigned by IANA to omscontact (OMS Contact).

4161

How omscontact works

Other services
client:4161omscontactresponse client:4161omscontactresponse

The client sends a request to port 4161 and the omscontact 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 4161 dangerous?

We have no specific security note for port 4161. 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 4161

ServicePortTransportDescriptionReferenceUpdated
omscontact 4161 TCP, UDP OMS Contact - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4161, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4161'      # process listening on 4161
sudo lsof -nP -i :4161

macOS

sudo lsof -nP -i :4161

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4161 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4161
netstat -ano | findstr :4161

From another machine

nmap -p 4161 -sV <host>
sudo nmap -sU -p 4161 <host>
nc -zv <host> 4161

Block it in the firewall

sudo ufw deny 4161/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4161" -Direction Inbound -LocalPort 4161 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4161 used for?

Port 4161 is assigned by IANA to omscontact (OMS Contact).

Is port 4161 TCP or UDP?

Port 4161 is registered for TCP and UDP.

Is it safe to open port 4161?

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 4161 is open?

On Linux run "ss -ltnup 'sport = :4161'", on macOS "lsof -nP -i :4161", and on Windows "netstat -ano | findstr :4161" to see the local process. From another machine, "nmap -p 4161 <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