Channel 144 (5.720 GHz) is a 20 MHz channel was added in March 2014 specifically as part of the official 802.11ac specification so that the new Wi-Fi amendment would support an additional 80 MHz channel of 132-144 (see the figure above).
While this additional 20 MHz channel is supported now in the 5 GHz band for Wi-Fi use, most legacy 802.11a and 802.11n clients don't actually support Channel 144 in their firmware. These clients will support the 20 MHz channels 132, 136, 140 and (for 802.11n 5 GHz) the 40 MHz channel 132+136.
Furthermore, even on 802.11ac access points, many AP vendors still have firmware that complies with the older FCC specifications - pre-March 2014 and do not recognize Channel 144 as valid for use. Accordingly, Channel 144 (20 MHz), Channel 143 (40 MHz), and Channel 138 (80 MHz) often cannot be used.
Starting from version 4.0, LizardSystems Wi-Fi Scanner supports 144 channel.