def _is_ip_address(pattern):
    """
    Check whether *pattern* could be/match an IP address.

    :param pattern: A pattern for a host name.
    :type pattern: `bytes` or `unicode`

    :return: `True` if *pattern* could be an IP address, else `False`.
    :rtype: bool
    """
    if isinstance(pattern, bytes):
        try:
            pattern = pattern.decode("ascii")
        except UnicodeError:
            return False

    try:
        int(pattern)
        return True
    except ValueError:
        pass

    try:
        ipaddress.ip_address(pattern.replace("*", "1"))
    except ValueError:
        return False

    return True

    Check whether *pattern* could be/match an IP address.

    :param pattern: A pattern for a host name.
    :type pattern: `bytes` or `unicode`

    :return: `True` if *pattern* could be an IP address, else `False`.
    :rtype: bool
    
stackoverflow/venv/lib/python3.6/site-packages/service_identity/_common.py