macchecker.py

#!/usr/bin/env python

#Ale Zuvic (AirieFenix)
#Thanks to macvendors.com for their incredibly simple API

import requests
import sys

BASE_URL = 'http://api.macvendors.com' # I removed the trailing '/' as I would add that when creating the url

def check_vendor(mac):
  url = "{}/{}".format(BASE_URL, mac)
  r = requests.get(url)

  if r.status_code == 404:
    return None
  elif r.status_code == 200:
    return r.text

if __name__=="__main__":

  if  len(sys.argv) < 2:
    print("Please provide a MAC.")
  else:
    vendor = check_vendor(sys.argv[1])
    
      if vendor:
        print("The MAC vendor is: {}".format(vendor))
      else:
        print('Vendor not found.')