[knot-dns-users] zone delagation format?

Hello, could you please send me a short guide how to delegate a zone subnet (class) to different NS. I have a zone  i.e.  0.10.in-addr.arpa.zone where I would like to delegate a part of the zone 10.0.0.104/29  (255.255. 255.248) to different NS. It includes 8 IP addresses (10.0.0.104, 10.0. 0.105, 10.0.0.106 .... 10.0.0.111) then I create a record in the mentioned zone like  104/29.0.0.10.in-addr.arpa. 300 NS my.test.server. I tried to understand the syntax in RFC 2317 (https://tools.ietf.org/html/ rfc2317) but it seems to be wrongly implemented from my side. When I tried to "dig" records I have to ask next IP address in the row not like dig -x 10.0.0.105 bud like dig -x 10.0.0.104/29.105 Many thanks for the clarification, best regards Milan.