This entry represents a potential sensor domain found at the N-terminal of bacterial diadenylate cyclases, which is typically followed by the DAC (Pfam:PF02457) domain. DACND consists of a compact core formed by seven beta-strands and two or three alpha-helices, according to structure predictions. It is found in various phyla, including acidobacteria, actinobacteria, bacteroidetes, cyanobacteria and planctomycetes.