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+.. highlight:: console
+
+``knsec3hash`` – NSEC hash computation utility
+==============================================
+
+Synopsis
+--------
+
+:program:`knsec3hash` *salt* *algorithm* *iterations* *name*
+
+:program:`knsec3hash` *algorithm* *flags* *iterations* *salt* *name*
+
+Description
+-----------
+
+This utility generates a NSEC3 hash for a given domain name and parameters of NSEC3 hash.
+
+Parameters
+..........
+
+*salt*
+  Specifies a binary salt encoded as a hexadecimal string.
+
+*algorithm*
+  Specifies a hashing algorithm by number. Currently, the only supported algorithm is SHA-1 (number 1).
+
+*iterations*
+  Specifies the number of additional iterations of the hashing algorithm.
+
+*name*
+  Specifies the domain name to be hashed.
+
+Exit values
+-----------
+
+Exit status of 0 means successful operation. Any other exit status indicates
+an error.
+
+Examples
+--------
+
+::
+
+  $ knsec3hash 1 0 10 c01dcafe knot-dns.cz
+  7PTVGE7QV67EM61ROS9238P5RAKR2DM7 (salt=c01dcafe, hash=1, iterations=10)
+
+::
+
+  $ knsec3hash - 1 0 net
+  A1RT98BS5QGC9NFI51S9HCI47ULJG6JH (salt=-, hash=1, iterations=0)
+
+See Also
+--------
+
+:rfc:`5155` – DNS Security (DNSSEC) Hashed Authenticated Denial of Existence.
+
+:manpage:`knotc(8)`, :manpage:`knotd(8)`.