Merge pull request #368 from Nibba2018/dns-lookup

Add DNS Lookup

Author: tejan-singh

Python/DNS-Lookup/README.md

@@ -0,0 +1,11 @@
+# DNS Lookup
+The Domain Name System is a hierarchical and decentralized naming system for computers, services, or other resources connected to the Internet or a private network. It associates various information with domain names assigned to each of the participating entities.
+
+## Executing the Script
+  * Run: `python lookup.py <website or IP address>`
+  * for e.g `python lookup.py google.com`
+  * or `python lookup.py 142.250.67.174`
+
+## Output
+
+![output](output.png)

Python/DNS-Lookup/lookup.py

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+import sys
+import socket
+import ipaddress
+
+if len(sys.argv) < 2:
+    sys.exit("Please provide an IP address or a domain name.")
+
+query = sys.argv[1]
+
+try:
+    ipaddress.ip_address(query)
+except:
+    ipv4, ipv6 = map(lambda x: x[4][0], socket.getaddrinfo(query,22,type=socket.SOCK_STREAM))
+    print("Domain Name:", query)
+    print("IPV4:", ipv4)
+    print("IPV6:", ipv6)
+    print("Server Domain:", socket.gethostbyaddr(ipv4)[0])
+else:
+    ip_info = socket.gethostbyaddr(query)
+    print("Domain Name:", ip_info[0])
+    print("IP:", query)