[Python] Python program to find active port on a website?

My college has some ports. Something like this http://www.college.in:913 I want a program to find the active ones. I mean I want those port number in which the website is working. Here is a code. But it takes a lot of time.

from urllib.request import Request, urlopen
from urllib.error import URLError, HTTPError
for i in range(1,10000):
req = Request("http://college.edu.in:"+str(i))
try:
response = urlopen(req)

except URLError as e:
print("Error at port"+str(i) )
else:
print ('Website is working fine'+str(i))

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