Cybersecurity-Projects/PROJECTS/beginner/dns-lookup/README.md

```ruby
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```

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> Professional DNS query CLI with Rich terminal output, reverse lookups, and WHOIS integration.

*This is a quick overview — security theory, architecture, and full walkthroughs are in the [learn modules](#learn).*

**[Screenshots & demo →](DEMO.md)**

## What It Does

- Query A, AAAA, MX, NS, TXT, CNAME, and SOA records with colored table output
- Reverse DNS lookup to resolve IP addresses back to hostnames
- Trace DNS resolution path from root servers to authoritative nameservers
- Batch lookups with concurrent queries for processing domain lists
- WHOIS integration for domain registration information
- JSON export for scripting and pipeline integration

## Quick Start

```bash
uv tool install dnslookup-cli
dnslookup query example.com
```

> [!TIP]
> This project uses [`just`](https://github.com/casey/just) as a command runner. Type `just` to see all available commands.
>
> Install: `curl -sSf https://just.systems/install.sh | bash -s -- --to ~/.local/bin`

## Commands

| Command | Description |
|---------|-------------|
| `dnslookup query` | Query DNS records for a domain with colored table output |
| `dnslookup reverse` | Resolve an IP address back to its hostname |
| `dnslookup trace` | Trace the DNS resolution path from root to authoritative servers |
| `dnslookup batch` | Query multiple domains concurrently from a file |
| `dnslookup whois` | Retrieve WHOIS registration information for a domain |

## Learn

This project includes step-by-step learning materials covering security theory, architecture, and implementation.

| Module | Topic |
|--------|-------|
| [00 - Overview](learn/00-OVERVIEW.md) | Prerequisites and quick start |
| [01 - Concepts](learn/01-CONCEPTS.md) | Security theory and real-world breaches |
| [02 - Architecture](learn/02-ARCHITECTURE.md) | System design and data flow |
| [03 - Implementation](learn/03-IMPLEMENTATION.md) | Code walkthrough |
| [04 - Challenges](learn/04-CHALLENGES.md) | Extension ideas and exercises |


## License

AGPL 3.0