cidr_info.py

#!/usr/bin/env python3
#
# Copyright (c) 2024 defparam
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
# usage: ./cidr_info.py <org_name>  (i.e. ./cidr_info.py paypal)
#
# Note: you likely need to pip install BeautifulSoup4 and requests

from bs4 import BeautifulSoup
import sys
import requests

def get_cidrs_from_asn(asn):
    url = f"https://bgp.he.net/{asn}"
    r = requests.get(url)
    soup = BeautifulSoup(r.text, "html.parser")
    
    # find the table with an id that contains table_prefixes
    try:
        table = soup.find_all("table", id=lambda x: x and "table_prefixes" in x)[0]
    except:
        return []
    # print the first and second column for each row
    ret = []
    for row in table.find_all("tr"):
        try:
            ret += [row.find_all("td")[0].text.strip()]
        except:
            continue
    return ret

def lookup_asn_from_org(org):
    url = f"https://bgp.he.net/search?search%5Bsearch%5D={org}&commit=Search"
    r = requests.get(url)
    soup = BeautifulSoup(r.text, "html.parser")
    

    table = soup.find_all("table")[0]
    # print the first and second column for each row

    database = {}
    for row in table.find_all("tr"):
        try:
            if row.find_all("td")[1].text == "ASN":  
                database[row.find_all("td")[0].text] = row.find_all("td")[2].text
        except:
            continue
    return database

if __name__ == "__main__":
    org = sys.argv[1]
    for k,v in lookup_asn_from_org(org).items():
        if org.lower() not in v.lower():
            continue
        print(f"------- {k} - {v}-------", file=sys.stderr, flush=True)
        for cidr in get_cidrs_from_asn(k):
            print(cidr, flush=True)