Fetch IPv4 blocks of googleusercontent.com

google-user-content-ip-list.py

import re
from scapy.all import *
from scapy.layers.dns import DNS, DNSQR
from scapy.layers.inet import IP, UDP

def query(n, t="TXT"):
    return sr1(
        IP(dst="8.8.8.8") / UDP(dport=53) / DNS(rd=1, qd=DNSQR(qname=n, qtype=t)),
        verbose=False,
    )[DNS]

google = "_cloud-netblocks.googleusercontent.com"

netblocks = re.findall("include:([^ ]+)", str(query(google).an.rdata))
ips = [ip for nb in netblocks for ip in re.findall("ip4:([^ ]+)", str(query(nb).an.rdata))]

print(",".join(ips))