localhost:11434: what runs on it and how to open it
Port 11434 is Ollama’s local API for running AI models. How to check it, start it and fix connection errors.
Open this address: http://localhost:11434This opens on your own computer. It only works if the program is running.
localhost:11434 is the local API for Ollama, which runs AI models on your own computer. It is meant for programs, so the browser shows only a short status message.
What runs on localhost:11434
- Ollama, the local AI model server. This is an API, not a web page.
Commands to start and test port 11434
ollama serveollama run llama3.2curl http://localhost:11434curl http://localhost:11434/api/tagsFind what is using port 11434
Run these in a terminal on your computer. Nothing is sent to this site.
If localhost:11434 will not open
- Browser shows only “Ollama is running”
- That is correct. Port 11434 is an API. Use the Ollama app, the terminal, or a web UI that connects to it.
- connection refused
- Ollama is not running. Open the Ollama app or run
ollama serve. - Docker cannot reach Ollama
- Inside a container, use host.docker.internal:11434 instead of localhost.
- Another device cannot connect
- Start Ollama with
OLLAMA_HOST=0.0.0.0:11434and allow the port in your firewall.
Other ports like 11434
| Port | Usually used by |
|---|---|
| localhost:5601 | Kibana |
| localhost:11501 | Not a standard port: check what is using it |
| localhost:9200 | Elasticsearch |
| localhost:5672 | RabbitMQ |
| localhost:15672 | RabbitMQ admin page |
| localhost:9090 | Prometheus |
| localhost:9229 | Node.js debugger |
Questions about localhost:11434
- What is localhost:11434?
- The local API of Ollama, used to run AI models on your computer. It is not a web page.
- How do I check that Ollama is running?
- Run curl http://localhost:11434. The reply "Ollama is running" means it is.
- Is localhost:11434 safe?
- Yes while it stays on localhost. Tools like this often show sensitive data, so keep them off the public internet and put a login in front of them if other people can reach the port.
- Can I use a different port instead of 11434?
- Yes. Pick a free port above 1024, set it in the program, and open that number instead. If other programs connect to this port, change it there as well.
- How do I check what is using port 11434?
- Use the port checker on this page. It shows the command for Windows, macOS and Linux and does not send anything to this site.
Free tools that help
- Common ports listSearch a list of common TCP and UDP port numbers: SSH 22, HTTP 80, HTTPS 443, MySQL 3306, PostgreSQL 5432 and more, with dev server ports.