CyberHunter
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// Other services

Port 2161: APC 2161

Port 2161 is assigned by IANA to apc-2161 (APC 2161).

2161

How apc-2161 works

Other services
client:2161apc-2161response client:2161apc-2161response

The client sends a request to port 2161 and the apc-2161 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 2161 dangerous?

We have no specific security note for port 2161. 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 2161

ServicePortTransportDescriptionReferenceUpdated
apc-2161 2161 TCP, UDP APC 2161 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2161, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2161'      # process listening on 2161
sudo lsof -nP -i :2161

macOS

sudo lsof -nP -i :2161

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2161 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2161
netstat -ano | findstr :2161

From another machine

nmap -p 2161 -sV <host>
sudo nmap -sU -p 2161 <host>
nc -zv <host> 2161

Block it in the firewall

sudo ufw deny 2161/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2161" -Direction Inbound -LocalPort 2161 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2161 used for?

Port 2161 is assigned by IANA to apc-2161 (APC 2161).

Is port 2161 TCP or UDP?

Port 2161 is registered for TCP and UDP.

Is it safe to open port 2161?

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 2161 is open?

On Linux run "ss -ltnup 'sport = :2161'", on macOS "lsof -nP -i :2161", and on Windows "netstat -ano | findstr :2161" to see the local process. From another machine, "nmap -p 2161 <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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