Angela Coker Mayhall appeals the 20-month sentence imposed upon revocation of supervised release. “This Court must examine the basis of its jurisdiction, on its own motion, if necessary.” Mosley v. Cozby, 813 F.2d 659, 660 (5th Cir. 1987). The website of the Bureau of Prisons shows that Mayhall was released from prison on May 18, 2012, and the district court im *474 posed no further term of supervised release. Therefore, Mayhall has no “concrete and continuing injury,” and there is no case or controversy over which this court may exercise jurisdiction under Article III, § 2, of the Constitution. See Spencer v. Kemna, 523 U.S. 1, 7, 118 S.Ct. 978, 140 L.Ed.2d 43 (1998). Consequently, the appeal is DISMISSED as MOOT.