This lets you generate an IPv4

random_ipv4_generator_plus_blocklist.py

import random
import ipaddress

# -------------------------------
# BUILT-IN EXCLUDED RANGES (IANA + Reserved)
# -------------------------------
EXCLUDED_CIDRS = [
    "0.0.0.0/8",
    "10.0.0.0/8",
    "100.64.0.0/10",
    "127.0.0.0/8",
    "169.254.0.0/16",
    "172.16.0.0/12",
    "192.0.0.0/24",
    "192.0.2.0/24",
    "192.88.99.0/24",
    "192.168.0.0/16",
    "198.18.0.0/15",
    "198.51.100.0/24",
    "203.0.113.0/24",
    "224.0.0.0/4",
    "240.0.0.0/4",
    "255.255.255.255/32"
]

# Convert to network objects once
EXCLUDED_NETWORKS = [ipaddress.ip_network(cidr) for cidr in EXCLUDED_CIDRS]


# -------------------------------
# LOAD OPTIONAL OPT-OUT LIST
# -------------------------------
def load_opt_out_ranges(file_path="opt_out_ranges.txt"):
    networks = []
    try:
        with open(file_path, "r") as f:
            for line in f:
                line = line.strip()
                if line and not line.startswith("#"):
                    networks.append(ipaddress.ip_network(line))
    except FileNotFoundError:
        pass  # No opt-out file is fine
    return networks


OPT_OUT_NETWORKS = load_opt_out_ranges()


# -------------------------------
# CHECK IF IP IS ALLOWED
# -------------------------------
def is_allowed(ip):
    for net in EXCLUDED_NETWORKS:
        if ip in net:
            return False

    for net in OPT_OUT_NETWORKS:
        if ip in net:
            return False

    return True


# -------------------------------
# GENERATE RANDOM PUBLIC IP
# -------------------------------
def generate_random_ip():
    while True:
        # Generate random 32-bit integer
        ip_int = random.randint(0, 2**32 - 1)
        ip = ipaddress.IPv4Address(ip_int)

        if is_allowed(ip):
            return str(ip)


# -------------------------------
# MAIN EXECUTION
# -------------------------------
if __name__ == "__main__":
    print("Random Allowed IPv4 Addresses:\n")

    for _ in range(10):
        print(generate_random_ip())