Development

Complete guide to localhost:4891 - the default port for the GPT4All local API server.

Complete guide to localhost:11434 - the default port for Ollama, the popular open-source tool for running local LLMs.

The CLI coding agents worth using in October 2026: Claude Code on Opus 5.5, OpenAI Codex on GPT-6.1 Sol, OpenCode at 212k+ stars, Cursor CLI now part of SpaceX, Antigravity CLI after the Gemini CLI shutdown, and where Aider, Pi, DeepSeek Harness and the rest of the open-source field fit.

Master SSH port forwarding with practical examples for local, remote, and dynamic tunneling. Learn how to securely access databases, bypass firewalls, and debug applications.

Understand `127.0.0.1`, loopback addresses, and how they work in networking. Learn why localhost points to `127.0.0.1` and how to use loopback for development and testing.

The AI coding tools worth installing in late 2026: Cursor after the SpaceX deal, Google Antigravity, GitHub Copilot's credit billing, Cline, Kilo Code, Zed, Kiro, and terminal agents like Claude Code, OpenAI Codex, DeepSeek Harness, OpenCode, Pi, Amp, Grok Build, and Droid.

Complete guide to localhost:8000 - the popular port used by Django, Python HTTP servers, and various development frameworks.

Complete guide to localhost:5432 - the default port for PostgreSQL database server, connections, and development workflows.

Complete guide to localhost:5173 - the default port for Vite development server used by Vue.js, React, and modern frontend frameworks.

Complete guide to localhost:4200 - the default port for Angular development server used by Angular CLI and modern frontend development.