How can I convert an IP address into a URL?

[jaimeggb]

Hi all

In the ‘port scanner’ project, we are asked to print a string with the URL and IP address of the website we are scanning.

As you can see in the image below, sometimes we are given the IP address and sometimes the URL.

Converting a URL into an IP address is easy, we just need to use the line:

target = "www.freecodecamp.org"
target_ip = socket.gethostbyname(target)

But it seems that converting an IP address into a URL is hard. I think I found a solution online which is this:

from dns import resolver,reversename
addr = reversename.from_address(target_ip)
target_URL = str(resolver.query(addr,"PTR")[0])

But I am unable to install dnspython in my computer for some reason

My question is: is there an easier way of doing this? Is using dnspython the only way? How have others done this in their own project?

Thanks for your time

Jaime

Your code so far

import socket
import re

def get_open_ports(*arg):
    if len(arg) == 2:
        target = arg[0]
        port_range = arg[1]
        verbose = False
    elif len(arg) == 3:
        target = arg[0]
        port_range = arg[1]
        verbose = arg[2]

    if re.findall(r'\b((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.|$)){4}\b', target):
        target_ip = target
        from dns import resolver,reversename
        addr = reversename.from_address(target_ip)
        target_URL = str(resolver.query(addr,"PTR")[0])
        print(target_URL)
    else:
        target_ip = socket.gethostbyname(target)
        target_URL = target

    open_ports = []
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    for i in range(port_range[0], port_range[1], 1):
        if s.connect_ex((target_ip, i)):
            continue
        else:
            open_ports.append(i)
    return_string = open_ports
    
    if verbose:
        line1 = 'Open ports for ' + target_URL + ' (' + target_ip + ')'
        return_string = f"{line1}\n"
    
    return return_string

get_open_ports("137.74.187.100", [442,445], True)

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36

Challenge: Port Scanner

Link to the challenge:

freeCodeCamp.org

[sanity]

It’s not required to use any external library. Take a look at gethostbyaddr function from the socket module.