Yes, male models who are 5'11" in height do exist, and this height is often considered within the acceptable range for runway modeling.
Male runway models are typically between 5'11" and 6'3". This height range is preferred because it helps models maintain a strong presence on the runway and is suitable for the length of most high-fashion garments. While some agencies may prefer models at the taller end of this spectrum, 5'11" is generally considered acceptable and sometimes even desirable, particularly for commercial modeling work. The specific requirements can vary depending on the agency, the market (e.g., high fashion vs. commercial), and the specific needs of the clients they represent.