[Python] How to use python regex to extract IP address from server log files?

I am currently getting started with python. I have a server log file for the pages I visited over a period of time.

How do I write a python program to find out which IP address was visited most? Will I have to use dictionary? I have done this but I am not sure how to use regex to fetch IP addresses.

import re

openFile = open('text.txt', "r")

readLines = openFile.read()
# pat = re.compile("^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$")
wordfreq = {}

for word in readLines.split():
if word not in wordfreq:
wordfreq[word] = 1
else:
wordfreq[word] += 1

print(wordfreq)

# wordList = [(v,k) for k,v in wordfreq.items()]
# wordList.sort(reverse=True)
#
# print(wordList)


PS: I don't want to use counter from python module. I am figuring out to do this with dictionary.

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