CyberHunter
Local dataset, no network
// Other services

Port 2111: OPNET Dynamic Sampling Agent Transaction Protocol

Port 2111 is assigned by IANA to dsatp (OPNET Dynamic Sampling Agent Transaction Protocol).

2111

How dsatp works

Other services
client:2111dsatpresponse client:2111dsatpresponse

The client sends a request to port 2111 and the dsatp 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 2111 dangerous?

We have no specific security note for port 2111. 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 2111

ServicePortTransportDescriptionReferenceUpdated
dsatp 2111 TCP, UDP OPNET Dynamic Sampling Agent Transaction Protocol - 2011-09-21

// source: IANA service name and port number registry

03 Check it

Which program uses port 2111, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2111'      # process listening on 2111
sudo lsof -nP -i :2111

macOS

sudo lsof -nP -i :2111

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2111 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2111
netstat -ano | findstr :2111

From another machine

nmap -p 2111 -sV <host>
sudo nmap -sU -p 2111 <host>
nc -zv <host> 2111

Block it in the firewall

sudo ufw deny 2111/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2111" -Direction Inbound -LocalPort 2111 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2111 used for?

Port 2111 is assigned by IANA to dsatp (OPNET Dynamic Sampling Agent Transaction Protocol).

Is port 2111 TCP or UDP?

Port 2111 is registered for TCP and UDP.

Is it safe to open port 2111?

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 2111 is open?

On Linux run "ss -ltnup 'sport = :2111'", on macOS "lsof -nP -i :2111", and on Windows "netstat -ano | findstr :2111" to see the local process. From another machine, "nmap -p 2111 <host>" shows whether it is reachable.

05 Related
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