rasn by copyleftdev - MCP Server

RASN - Rust ASN Mapper

High-performance ASN lookup system with SIMD acceleration, multi-level caching, and MCP server for AI agents.

Features

SIMD Acceleration - Fast IP lookups with AVX2 optimization
Apache Arrow/Parquet - Columnar storage for IP ranges
Multi-Level Cache - LRU + RocksDB cold storage
MCP Server - JSON-RPC 2.0 API for AI agents
Network Enrichment - DNS, WHOIS, GeoIP integration
CIDR Operations - /8-/32 range queries
Parallel Processing - Rayon batch operations
Production Ready - Rate limiting, metrics, Docker support

Performance

Benchmarked on modern hardware using hyperfine (100 runs):

CLI Lookup (includes startup + data load + lookup):
  Time (mean ± σ):     218.9 ms ±   4.9 ms
  Range (min … max):   207.0 ms … 237.5 ms

Note: Cold start time includes TSV parsing (28MB data). For high-throughput workloads, use the MCP server or keep the CLI process warm to amortize startup costs.

Installation

Quick Install (with data - installs to ~/.local)

git clone https://github.com/copyleftdev/rasn.git
cd rasn
make install    # Downloads data + installs binary (no sudo!)
# or: ./install.sh

Data is automatically downloaded on first install.

Binary only

cargo install --path crates/rasn-cli

Note: Binary-only install requires manual data setup. See for details.

Docker

Build locally:

docker build -t rasn:latest .
docker-compose up -d

Usage

CLI

# IP lookup
rasn lookup 8.8.8.8

# Batch processing
rasn batch --file ips.txt --workers 10

# JSON output
rasn lookup --output json 1.1.1.1

# MCP server (for Claude Desktop)
rasn mcp stdio

MCP Server

Add to Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json):

{
  "mcpServers": {
    "rasn": {
      "command": "rasn",
      "args": ["mcp", "stdio"]
    }
  }
}

Available MCP Tools:

lookup_ip - IP to ASN lookup
lookup_asn - ASN to IP ranges
lookup_domain - DNS + ASN resolution
bulk_lookup - Batch processing
cidr_analyze - CIDR calculations
reverse_lookup - PTR records
enrich_data - WHOIS + GeoIP

Docker Usage

# Build image
docker build -t rasn:latest .

# CLI usage
docker run --rm rasn:latest lookup 8.8.8.8

# MCP Server
docker run --rm -it rasn:latest mcp stdio

# Docker Compose
docker-compose up -d

Configuration

Environment Variables:

RASN_API_KEY - API key for external services

Check Status:

rasn auth status

Development

Setup

# Install dev tools and git hooks
make dev-setup

Common Tasks

# Run tests
cargo test --all-features --workspace

# Check format
cargo fmt --all -- --check

# Run clippy
cargo clippy --all-features --workspace -- -D warnings

# Build docs
cargo doc --all-features --no-deps --workspace

# Run all checks (same as pre-commit)
./hooks/pre-commit

Project Structure

rasn/
├── crates/
│   ├── rasn-core/      # Core types & security
│   ├── rasn-arrow/     # Arrow/Parquet + SIMD
│   ├── rasn-cache/     # Multi-level caching
│   ├── rasn-cidr/      # CIDR operations
│   ├── rasn-client/    # HTTP client + rate limiting
│   ├── rasn-db/        # RocksDB storage
│   ├── rasn-geoip/     # GeoIP integration
│   ├── rasn-mcp/       # MCP JSON-RPC server
│   ├── rasn-resolver/  # DNS resolution
│   ├── rasn-whois/     # WHOIS client
│   └── rasn-cli/       # CLI interface
├── examples/           # Usage examples
└── docs/               # Documentation

License

MIT - see for details.