Можете объяснить как правильно сделать?One or more /24 type zones need to be created if your address space has a prefix length between /17 and /24. If your prefix length is between /16 and /9 you will have to request one or multiple delegations for /16 type zones. If you have an address block with a prefix of /25 or larger you will have to revert to Classless Delegations.
For example we have been assigned 10.155.16/21. We therefore have to create eight reverse zones 16.155.10.in-addr.arpa, 17.155.10.in-addr.arpa, 18.155.10.in-addr.arpa, 19.155.10.in-addr.arpa, 20.155.10.in-addr.arpa, 21.155.10.in-addr.arpa, 22.155.10.in-addr.arpa and 23.155.10.in-addr.arpa.
Читал http://www.netup.ru/UTM5/articles.php?n=24.