netflix-asn

A small Python utility that fetches IPv4/IPv6 prefixes announced by one or more ASNs (via the BGPView API) and ensures those prefixes are present in a MikroTik IP firewall address-list.

It’s designed to run inside Docker — using a Dockerfile and docker-compose.yml.

Features

• Fetches all IPv4/IPv6 prefixes announced by one or more ASNs.
• Adds missing prefixes to a MikroTik address-list.
• Skips existing entries to avoid duplicates.
• Logs progress and errors clearly.
• Suitable for manual or scheduled execution.

Quick Start

1. Create a .env file (see Example .env).

2. Build the Docker image:

   docker-compose build
   

3. Run the container:

   docker-compose up -d
   

4. View logs:

   docker-compose logs -f asn-syncer
   

Example .env

# Target ASN(s) — default is AS2906 (Netflix)
ASN=AS55095,AS40027,AS394406,AS2906

# MikroTik API connection
MIKROTIK_HOST=192.168.88.1
USERNAME=admin
PASSWORD=verysecret

# Name of the address-list on the MikroTik
ADDRESS_LIST_NAME=Netflix

Tip: Keep your .env file out of version control.
Use Docker secrets or a secure secrets manager for production deployments.

Environment Variables

Variable	Required	Default	Description
ASN	No	AS2906	Comma-separated list of ASNs to fetch prefixes from.
MIKROTIK_HOST	Yes	—	IP or hostname of the MikroTik device.
USERNAME	Yes	—	MikroTik API username.
PASSWORD	Yes	—	MikroTik API password.
ADDRESS_LIST_NAME	No	Netflix	MikroTik address-list name to add entries to.

The script sets a fixed timeout=24:00:00 for each address-list entry.
Modify the script if you prefer permanent entries.

How It Works

1. The script loads configuration from environment variables.
2. For each ASN, it queries:

   https://api.bgpview.io/asn/<ASN>/prefixes
   

3. It collects all IPv4/IPv6 prefixes and removes duplicates.
4. Connects to the MikroTik API using librouteros.
5. For each prefix:
   • Skips it if it already exists in the address-list.
   • Otherwise adds it with:
     • timeout=24:00:00
     • comment="Added from ASN"

Logging & Exit Codes

Type	Description
INFO	Normal progress messages (connection, added subnets, etc).
DEBUG	Skipped subnets that already exist.
ERROR/FATAL	Connection or API failure.

Exit Code	Meaning
0	Success
1	Fatal error (missing vars, API failure, or connection error)

Security Notes

• Never commit credentials or .env files to Git.
• Use dedicated API accounts on MikroTik with minimal permissions.
• Run the container within a trusted network or over a secure VPN.
• Use Docker secrets for sensitive information in production.

License

This project is provided under the MIT License — free for personal and commercial use.