host_provider

#!/usr/bin/env python3

import fileinput
import re
import subprocess
from functools import cache


@cache
def ips(hostname):
    for line in subprocess.run(
        ["host", hostname], capture_output=True, check=True, encoding="utf8"
    ).stdout.splitlines():
        if m := re.search(r"has address (.+)$", line):
            yield m.group(1)


@cache
def whois(ip_address):
    txt = subprocess.run(
        ["whois", ip_address], capture_output=True, check=True, encoding="utf8"
    ).stdout
    if m := re.search("^OrgName: +(.+)$", txt, re.MULTILINE):
        return m.group(1)

    return None


print("hostname,ip,provider")
for hostname in fileinput.input():
    hostname = hostname.strip()
    for ip in ips(hostname):
        print(f'{hostname},{ip},"{whois(ip)}"')