diff --git a/src/count_ip_addresses.py b/src/count_ip_addresses.py
new file mode 100644
index 0000000..b538448
--- /dev/null
+++ b/src/count_ip_addresses.py
@@ -0,0 +1,7 @@
+def ips_between(start, end):
+    start_a = start.split(".")
+    end_a = end.split(".")
+    difference = 0
+    for index, i in enumerate(start_a):
+        difference += (int(end_a[index]) - int(i)) * 256 ** (3 - index)
+    return difference