Bgp asn lookup with python

When working with BGP (Border Gateway Protocol) in Python, it is often necessary to perform ASN (Autonomous System Number) lookups. This allows us to retrieve information about the organization that owns a specific IP address or network. In this article, we will explore three different ways to perform BGP ASN lookups using Python.

Option 1: Using the ‘bgp’ library

The first option is to use the ‘bgp’ library, which provides a simple and straightforward way to perform BGP ASN lookups. To use this library, you need to install it first by running the following command:

pip install bgp

Once the library is installed, you can use the following code to perform a BGP ASN lookup:

from bgp import BGP

def bgp_asn_lookup(ip_address):
    bgp = BGP()
    result = bgp.lookup(ip_address)
    return result.asn

In this code, we create an instance of the ‘BGP’ class and call the ‘lookup’ method, passing the IP address as an argument. The method returns a result object, from which we can extract the ASN using the ‘asn’ attribute.

Option 2: Using the ‘pyasn’ library

The second option is to use the ‘pyasn’ library, which provides a more advanced and feature-rich way to perform BGP ASN lookups. To install this library, run the following command:

pip install pyasn

Once the library is installed, you can use the following code to perform a BGP ASN lookup:

import pyasn

def bgp_asn_lookup(ip_address):
    asndb = pyasn.pyasn('ipasn_20211207.dat')
    result = asndb.lookup(ip_address)
    return result[0]

In this code, we create an instance of the ‘pyasn’ class, passing the path to the IP-to-ASN mapping database file as an argument. We then call the ‘lookup’ method, passing the IP address as an argument. The method returns a tuple, from which we can extract the ASN using the index 0.

Option 3: Using the ‘socket’ library

The third option is to use the ‘socket’ library, which provides a low-level way to perform BGP ASN lookups. This option requires manually sending BGP messages and parsing the responses. Here is an example code:

import socket

def bgp_asn_lookup(ip_address):
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.connect(('route-views.routeviews.org', 43))
    sock.sendall(f'!g{ip_address}n'.encode())
    response = sock.recv(4096).decode()
    sock.close()
    result = response.split('n')[1].split()[1]
    return result

In this code, we create a TCP socket and connect to a BGP route server. We then send a BGP query message for the given IP address and receive the response. Finally, we parse the response to extract the ASN.

After exploring these three options, it is clear that the ‘bgp’ library (Option 1) provides the simplest and most convenient way to perform BGP ASN lookups in Python. It abstracts away the complexities of the underlying BGP protocol and provides a clean API for performing lookups. Therefore, Option 1 is the recommended approach for most use cases.

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7 Responses

  1. Option 3 seems like a hassle, but hey, who needs simplicity when you can have complexity, right? #sarcasm

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