IPsToHostnames.py

This script takes an input file full of IPs, resolves them, then sorts them alphabetically and case-insensitive.

tip

When the script is done, the output will look like this:

Resolved: HOST1
Resovled: HOST10

If you don't like that, you can run this on the output file:

sed 's/^Resolved: //' OMGNoSMBSigningLOL!.txt

import socket

def read_ips(file_path):
    """Read IPs from the input file."""
    with open(file_path, 'r') as file:
        return [line.strip() for line in file if line.strip()]

def nslookup(ip):
    """Perform nslookup on an IP address and return the hostname."""
    try:
        return socket.gethostbyaddr(ip)[0].split('.')[0]  # Return the primary hostname only
    except socket.herror:
        return None  # Return None if the IP cannot be resolved

def write_sorted_hostnames(hostnames, output_file):
    """Write sorted hostnames to the output file."""
    with open(output_file, 'w') as file:
        for hostname in hostnames:
            file.write(f"{hostname}\n")

def main():
    # Prompt the user for the input and output file names
    input_file = input("Enter the path to the input file: ").strip()
    output_file = input("Enter the path to the output file: ").strip()

    # Read IPs from the input file
    ips = read_ips(input_file)

    # Perform nslookup on each IP and collect hostnames
    hostnames = []
    for ip in ips:
        hostname = nslookup(ip)
        if hostname:
            hostnames.append(hostname)
            print(f"Resolved: {hostname}")
        else:
            print(f"Could not resolve IP: {ip}")

    # Sort hostnames case-insensitively
    hostnames = sorted(hostnames, key=str.lower)

    # Write the sorted hostnames to the output file
    write_sorted_hostnames(hostnames, output_file)
    print(f"Sorted hostnames written to {output_file}")

if __name__ == "__main__":
    main()