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// Other services

Port 3341: OMF data h

Port 3341 is assigned by IANA to anet-h (OMF data h).

3341

How anet-h works

Other services
client:3341anet-hresponse client:3341anet-hresponse

The client sends a request to port 3341 and the anet-h 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 3341 dangerous?

We have no specific security note for port 3341. 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 3341

ServicePortTransportDescriptionReferenceUpdated
anet-h 3341 TCP, UDP OMF data h - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3341, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3341'      # process listening on 3341
sudo lsof -nP -i :3341

macOS

sudo lsof -nP -i :3341

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3341 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3341
netstat -ano | findstr :3341

From another machine

nmap -p 3341 -sV <host>
sudo nmap -sU -p 3341 <host>
nc -zv <host> 3341

Block it in the firewall

sudo ufw deny 3341/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3341" -Direction Inbound -LocalPort 3341 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3341 used for?

Port 3341 is assigned by IANA to anet-h (OMF data h).

Is port 3341 TCP or UDP?

Port 3341 is registered for TCP and UDP.

Is it safe to open port 3341?

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 3341 is open?

On Linux run "ss -ltnup 'sport = :3341'", on macOS "lsof -nP -i :3341", and on Windows "netstat -ano | findstr :3341" to see the local process. From another machine, "nmap -p 3341 <host>" shows whether it is reachable.

05 Related
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