ipasnmatcher 0.2.1

A Python package that allows you to verify if an IP address belongs to a specific ASN's network ranges.

ipasnmatcher

A Python package to verify if an IP address belongs to a specific ASN's network ranges using RIPEstat data.

Features

• Fast IP-to-ASN matching with optimized network ranges
• Built-in caching to minimize API requests
• Optional strict mode to consider only active prefixes
• Uses accurate data from RIPE NCC

Installation

pip install ipasnmatcher

Usage

from ipasnmatcher import ASN

# Creating an ASN object fetches prefix data from the RIPEstat API and caches it locally
asn = ASN(asn="AS151981")

# Check if an IP belongs to this ASN
print(asn.match("153.53.148.45"))  # True or False

Advanced Usage

asn = ASN(
    asn="AS15169",      # ASN (e.g., Google)
    strict=True,        # Only consider active prefixes
    cache_max_age=7200  # Cache duration in seconds (2 hours)
)

Combine ASN objects

Merge multiple ASNs with + to check IPs against all their prefixes:

from ipasnmatcher import ASN

google = ASN("AS15169")      # Google
cloudflare = ASN("AS13335")  # Cloudflare

combined = google + cloudflare
print(combined.match("8.8.8.8"))   # True (Google)
print(combined.match("1.1.1.1"))   # True (Cloudflare)

repr() shows the full combination:

ASN(asn='AS15169', strict=False, cache_max_age=3600) + ASN(asn='AS13335', strict=False, cache_max_age=3600)

Parameters

ASN(asn: str, strict: bool = False, cache_max_age: int = 3600)

• asn: ASN identifier in format "AS12345"
• strict: If True, only prefixes currently active are considered (default: False)
• cache_max_age: Cache lifetime in seconds (default: 3600)

How it works

• On initialization, the ASN object fetches announced prefixes from the RIPEstat API and caches them locally in .ipasnmatcher_cache/{asn}.json.
• Subsequent uses load data from cache if it is fresh (not older than cache_max_age).
• Matching IPs against ASN prefixes is done efficiently using Python's ipaddress module.

Use Cases

• Network security and traffic validation
• CDN traffic routing based on ASN ownership
• IP classification by network operators
• Compliance monitoring of network connections

GitHub

Star or fork this project on GitHub.

License

This project is licensed under the MIT License. See the LICENSE file for details.