- 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.
Port 11434: Ollama
Port 11434 is assigned by IANA to ollama (Ollama).
11434
How ollama works
Other servicesThe 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
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:
IANA registry entries for port 11434
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| ollama | 11434 | TCP | Ollama | - | 2025-09-26 |
| - | 11434 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 11434, and is it reachable?
Linux
sudo ss -ltnup 'sport = :11434' # process listening on 11434
sudo lsof -nP -i :11434macOS
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
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.
Other other services ports
: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