NCT 127 (stylized as NCT #127) is the debut extended play by NCT 127, the Seoul-based sub-unit of South Korean boy band NCT. It was released digitally on July 10, 2016 and physically on July 11. The EP consists of seven tracks including the title track, "Fire Truck".

The mini-album was a commercial success topping the Gaon Album Chart. The EP sold 83,272 physical copies in 2016.

On June 30, 2016, it was announced that NCT would return with a second sub-unit named NCT 127, with the number 127 referring to the longitude of Seoul. NCT 127 comprises four members from the previous sub-unit NCT U (Taeyong, Jaehyun, Taeil, and Mark), and three new members (Yuta, Haechan, and WinWin).

The group debuted on July 7, 2016, with the music video for their debut single "Fire Truck" set for release at midnight KST but postponed till noon on 7 July 2016. NCT 127 performed "Fire Truck" and the B-side track "Once Again" for their debut stage on M! Countdown on July 7.

The EP was digitally released on July 10, it was physically released on July 11. This album including the bonus track "Switch", which features other SM Rookies members and music video released on December 20, 2016.

NCT #127 entered at number 2 on the Gaon Album Chart on the chart issue dated July 10-16, 2016. In its second week, the mini-album fell to number 3. In its third week, the EP topped the chart on the chart issue dated July 24-30, 2016. In its fourth week, the album fell to number 6, being in the Top 10 for four consecutive weeks

The mini-album entered and peaked at number 3 on the Gaon Album Chart for the month of July 2016 with 60,118 copies sold. The EP placed at number 10 for the month of August 2016 with 14,258 copies sold. The mini-album placed at number 32 on the Gaon Album Chart for the year 2016 with a total of 83,272 physical copies sold.

NCT #127 placed at number 32 on the Gaon Album Chart for the year-end 2016 with 83,272 physical copies sold.

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