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// Other services

Port 11434: Ollama

Port 11434 is assigned by IANA to ollama (Ollama).

11434

How ollama works

Other services
client:11434ollamaresponse client:11434ollamaresponse

The client sends a request to port 11434 and the ollama service answers.

Transport
TCP
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 11434 dangerous?

We have no specific security note for port 11434. 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 11434

ServicePortTransportDescriptionReferenceUpdated
ollama 11434 TCP Ollama - 2025-09-26
-11434-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 11434, and is it reachable?

Linux

sudo ss -ltnup 'sport = :11434'      # process listening on 11434
sudo lsof -nP -i :11434

macOS

sudo lsof -nP -i :11434

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 11434 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 11434
netstat -ano | findstr :11434

From another machine

nmap -p 11434 -sV <host>
nc -zv <host> 11434

Block it in the firewall

sudo ufw deny 11434/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 11434" -Direction Inbound -LocalPort 11434 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 11434 used for?

Port 11434 is assigned by IANA to ollama (Ollama).

Is port 11434 TCP or UDP?

Port 11434 is registered for TCP.

Is it safe to open port 11434?

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 11434 is open?

On Linux run "ss -ltnup 'sport = :11434'", on macOS "lsof -nP -i :11434", and on Windows "netstat -ano | findstr :11434" to see the local process. From another machine, "nmap -p 11434 <host>" shows whether it is reachable.

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