(addr)
return inet_ntop(socket.AF_INET, addr[2:6])
Extract IPv4 address embbeded in 6to4 address. Passed address must be
    a 6to4 addrees. None is returned on error.
Extract IPv4 address embbeded in 6to4 address. Passed address must be
    a 6to4 addrees. None is returned on error.
Extract IPv4 address embbeded in 6to4 address . Passed address must be a 6to4 addrees . None is returned on error .
def in6_6to4ExtractAddr(addr):
    """
    Extract IPv4 address embbeded in 6to4 address. Passed address must be
    a 6to4 addrees. None is returned on error.
    """
    try:
        addr = inet_pton(socket.AF_INET6, addr)
    except:
        return None
    if addr[:2] != " \x02":
        return None
    return inet_ntop(socket.AF_INET, addr[2:6])
def in6_6to4ExtractAddr ( addr ) : try : addr = inet_pton ( socket . AF_INET6 , addr ) except : return None if addr [ : 2 ] != " \x02" : return None return inet_ntop ( socket . AF_INET , addr [ 2 : 6 ] )