Takes a file containing list of domains as an input and gives their ipv4 address as an output in another file. I developed it basically for using masscan. It can also be used for educational purposes too.

ipgrabber.py

#!/usr/bin/env python

import sys
import socket

try:
    read_file = open(input("Enter path of the file containing subdomains: "),'r')    
    
    for host in read_file:
        try:
            ip=socket.gethostbyname(host.rstrip("\n"))
            print(ip)
            file = open("found_ip.txt","a")
            file.write(ip+"\n")
            file.close()
        except:
            print("Not Found")
    read_file.close()

except:
    print("File doesn't exist")