Hello, another post of code snippets, in this one, I want to leave basically 2 methods that I use whenever I need to do some operation with IPs or a list of IPs.
For example, if I have an IP and I need to know if it is in a Range of IPs, for any reason, BlockList, AllowList, etc., making the comparison by IP/String is impossible, doing it by RegEx is a way out, but it is a little confusing. Another, if I have a list of IPs and need to sort them, etc.
To do this, there is a very simple formula that transforms the IP Octets into Integers and then manages to transform this Integer back into IPs. Comparing, whether for lists, sort or whatever, integers is much easier than strings of IPs.
I will leave here the example of the two functions, two lists of IP Ranges, a list of IPs to be compared, and also how to sort a list of IPs.
def fn_IP_Int(ip):
h = list(map(int, ip.split(".")))
return (h[0] << 24) + (h[1] << 16) + (h[2] << 8) + (h[3] << 0)
def fn_Int_IP(ip):
return ".".join(map(str, [((ip >> 24) & 0xff), ((ip >> 16) & 0xff), ((ip >> 8) & 0xff), ((ip >> 0) & 0xff)]))
# List os Fake IPs
lst_Ips_to_Check = ['230.219.199.124', '194.179.131.102', '137.91.87.90', '98.37.134.83', '99.1.73.16', '79.32.206.156', '137.118.71.74', '228.152.130.69', '171.51.109.141', '6.112.94.147']
# IP ranges for blocking.
lst_RangeIps_to_Block = [{'Initial': '5.0.0.1', 'Final': '10.255.255.255'}, {'Initial': '50.0.0.1', 'Final': '126.255.255.255'}, {'Initial': '128.0.0.1', 'Final': '197.255.255.255'}]
# IP ranges to allow..
lst_RangeIps_to_Allow = [{'Initial': '10.0.0.0', 'Final': '10.255.255.255'}, {'Initial': '172.16.0.0', 'Final': '172.31.255.255'}, {'Initial': '192.168.0.0', 'Final': '192.168.255.255'}]
#######################################################################################################################
# Transforms the string IPs (Octets) to Int in order to compare the IP in a range of IPs.
print('Cheking lst_RangeIps_to_Block')
for item_IP in lst_Ips_to_Check:
for item_Range in lst_RangeIps_to_Block:
if fn_IP_Int(item_IP) >= fn_IP_Int(item_Range['Initial']) and fn_IP_Int(item_IP) <= fn_IP_Int(item_Range['Final']):
print('Checking IP: ' + item_IP + ' / Range: ' + item_Range['Initial'] + ' ~ ' + item_Range['Final'] + ': Found in the Range.')
else:
print('Checking IP: ' + item_IP + ' / Range: ' + item_Range['Initial'] + ' ~ ' + item_Range['Final'] + ': Not found in the Range.')
print('\n')
print('Cheking lst_RangeIps_to_Allow')
for item_IP in lst_Ips_to_Check:
for item_Range in lst_RangeIps_to_Allow:
if fn_IP_Int(item_IP) >= fn_IP_Int(item_Range['Initial']) and fn_IP_Int(item_IP) <= fn_IP_Int(item_Range['Final']):
print('Checking IP: ' + item_IP + ' / Range: ' + item_Range['Initial'] + ' ~ ' + item_Range['Final'] + ': Found in the Range.')
else:
print('Checking IP: ' + item_IP + ' / Range: ' + item_Range['Initial'] + ' ~ ' + item_Range['Final'] + ': Not found in the Range.')
#######################################################################################################################
# Another example of how to use IPs in Integers is for sorting, then transforming the IPs from numbers to strings (octets) again.
lst_Ints = list(map(fn_IP_Int, lst_Ips_to_Check))
print(list(map(fn_Int_IP, sorted(lst_Ints))))
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