diff --git a/windowskey b/windowskey
new file mode 100755
index 0000000..c6a02af
--- /dev/null
+++ b/windowskey
@@ -0,0 +1,85 @@
+#!/usr/bin/env python3
+
+
+import html.parser
+import os
+import sys
+import urllib.request
+
+
+"""
+Download Windows product keys from MicroSoft
+"""
+
+key_page_url = "https://docs.microsoft.com/en-us/windows-server/get-started/kms-client-activation-keys"
+
+
+def usage():
+    script = os.path.basename(sys.argv[0])
+    message = f"""Usage: {script} [windows-version]
+
+To specify the version of Windows you'd like, pass a string that matches the
+name of the operating system you'd like to download. Case doesn't matter, so
+you can use "windows 10" or "Windows 10".
+
+e.g.
+
+    {script} "Windows 10"
+    {script} "enterprise"
+
+"""
+    print(message, file=sys.stderr)
+    sys.exit(0)
+
+
+def download_page(url):
+    response = urllib.request.urlopen(url)
+    return response.read().decode("utf-8")
+
+
+class WindowsKeyPageParser(html.parser.HTMLParser):
+    def __init__(self, *, convert_charrefs=True):
+        super().__init__(convert_charrefs=True)
+        self.product_keys = {}
+        self.parsing_os = False
+
+    def handle_starttag(self, tag, attrs):
+        self.parsing_os = tag == "td"
+
+    def handle_endtag(self, tag):
+        self.parsing_os = False
+
+    def handle_data(self, data):
+        if self.parsing_os:
+            self.stash_table_cell(data)
+
+    def stash_table_cell(self, data):
+        if "Windows" in data:
+            self.current_os = data
+        else:
+            product_key = data
+            self.product_keys[self.current_os] = product_key
+
+
+def find_keys_for_all_versions(markup):
+    parser = WindowsKeyPageParser()
+    parser.feed(markup)
+    return parser.product_keys
+
+
+if __name__ == "__main__":
+    try:
+        arg = sys.argv[1]
+    except IndexError:
+        windows_version = ""
+    else:
+        if arg in ["-h", "--help"]:
+            usage()
+        windows_version = arg
+
+    markup = download_page(key_page_url)
+    product_keys = find_keys_for_all_versions(markup)
+
+    for os_name, product_key in product_keys.items():
+        if windows_version.lower() in os_name.lower():
+            print(f"{os_name}: {product_key}")