0000926282 2022-04-01 2022-04-01 0000926282 false 8-K 2022-04-01 ADTRAN, Inc. DE 000-24612 63-0918200 901 Explorer Boulevard Huntsville AL 35806-2807 256 963-8000 Not Applicable false false false false Common Stock, Par Value $0.01 per share ADTN NASDAQ false