Dimensional Anchor

A green ray springs from your outstretched hand. You must make a ranged spell attack to hit the target. Any creature or object struck by the ray is covered with a shimmering emerald field for the duration of the spell. The field prevents the target from using any method of extradimensional movement, including teleportation or travel to a different plane of existence. They don't prevent the creature from passing through an interdimensional portal (such as from Gate), but the target cannot create such a portal while affected, and could only use one created by another creature.

A dimensional anchor does not block extradimensional perception nor does it prevent summoned creatures from disappearing at the end of a summoning spell.