add reverse lookup tutorial

Author: x4nth055

README.md

@@ -69,6 +69,7 @@ This is a repository of all the tutorials of [The Python Code](https://www.thepy
     - [How to Make Malware Persistent in Python](https://thepythoncode.com/article/how-to-create-malware-persistent-in-python). ([code](ethical-hacking/persistent-malware))
     - [How to Remove Persistent Malware in Python](https://thepythoncode.com/article/removingg-persistent-malware-in-python). ([code](ethical-hacking/remove-persistent-malware))
     - [How to Check Password Strength with Python](https://thepythoncode.com/article/test-password-strength-with-python). ([code](ethical-hacking/checking-password-strength))
+    - [How to Perform Reverse DNS Lookups Using Python](https://thepythoncode.com/article/reverse-dns-lookup-with-python). ([code](ethical-hacking/reverse-dns-lookup))
 
 - ### [Machine Learning](https://www.thepythoncode.com/topic/machine-learning)
     - ### [Natural Language Processing](https://www.thepythoncode.com/topic/nlp)

ethical-hacking/reverse-dns-lookup/README.md

@@ -0,0 +1 @@
+# [How to Perform Reverse DNS Lookups Using Python](https://thepythoncode.com/article/reverse-dns-lookup-with-python)

ethical-hacking/reverse-dns-lookup/requirements.txt

@@ -0,0 +1 @@
+requests

ethical-hacking/reverse-dns-lookup/reverse_lookup.py

@@ -0,0 +1,69 @@
+# Import the necessary libraries
+import argparse
+import ipaddress
+import socket
+import requests
+
+API_KEY = "Your-Api-Key-Here"  # Replace with your ViewDNS API key
+
+# Function to Check if IP address is valid.
+def is_valid_ip(ip):
+
+    try:
+        ipaddress.ip_address(ip)
+        return True
+    except ValueError:
+        return False
+
+
+# Perform reverse look up.
+def reverse_lookup(ip):
+    try:
+        domain = socket.gethostbyaddr(ip)[0]
+        return domain
+    except socket.herror:
+        return None
+
+
+# Get websites on same server.
+def get_websites_on_server(ip):
+    url = f"https://api.viewdns.info/reverseip/?host={ip}&apikey={API_KEY}&output=json"
+    response = requests.get(url)
+    if response.status_code == 200:
+        data = response.json()
+        if "response" in data and "domains" in data["response"]:
+            websites = data["response"]["domains"]
+            return websites
+    return []
+
+
+# Get user arguments and execute.
+def main():
+    parser = argparse.ArgumentParser(description="Perform IP reverse lookup.")
+    parser.add_argument("ips", nargs="+", help="IP address(es) to perform reverse lookup on.")
+    parser.add_argument("--all", "-a", action="store_true", help="Print all other websites on the same server.")
+    args = parser.parse_args()
+
+    for ip in args.ips:
+        if not is_valid_ip(ip):
+            print(f"[-] Invalid IP address: {ip}")
+            continue
+
+        domain = reverse_lookup(ip)
+        if domain:
+            print(f"[+] IP: {ip}, Domain: {domain}")
+            if args.all:
+                websites = get_websites_on_server(ip)
+                if websites:
+                    print("\nOther websites on the same server:")
+                    for website in websites:
+                        print(f"[+] {website}")
+                    print('\n')
+                else:
+                    print("[-] No other websites found on the same server.")
+        else:
+            print(f"[-] No domain found for IP: {ip}")
+
+
+if __name__ == "__main__":
+    main()