re.compile and very specific searches

[rbt]

Is it possible to use re.compile to exclude certain numbers? For 
example, this will find IP addresses:

ip = re.compile('\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3}')
But it will also find 999.999.999.999 (something which could not 
possibly be an IPv4 address). Can re.compile be configured to filter 
results like this out?
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