To provide a clamp fastenable in different spread diameters without having a radially projected clamping jaw at the end section, and a device for releasing the clamp locked in the spread state, without danger.

This hose clamp for clamping a hose on a pipe has a spring band bent in ring shape and end sections that positively fasten each other in a fastening position when the spring band is in a spread-apart position widened past a nominal diameter of the hose against a spring force of the spring band. The fastening position of the end sections is releasable such that the spring band contracts about the hose. The end sections are positioned laterally adjacent to each other in an axial direction of the hose clamp and have a first edge and a second edge facing each other in the axial direction of the hose clamp. The first and second edges have at least one laterally projecting tooth, respectively.