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# https://stackoverflow.com/questions/2814002/private-ip-address-identifier-in-regular-expression
import re

pat = re.compile(
    r'^127\.'            r'|'
    r'^10\.'             r'|'
    r'^172\.1[6-9]\.'    r'|'
    r'^172\.2[0-9]\.'    r'|'
    r'^172\.3[0-1]\.'    r'|'
    r'^192\.168\.')

[bool(pat.match(ip)) for ip in ['172.16.13.9', '127.0.0.1', '10.234.99.9', '192.168.0.1', '233.233.1.2', '12.7.0.1']]