Reverse DNS Template Reference

Whole-IP patterns
	Substitution pattern	Example expansion using 192.168.23.45
Dashed IP	%i	192-168-23-45
Reverse dashed IP	%r	45-23-168-192
Hex-coded IP	%h	c0a8172d
Decimal IP	%d	323241453
%i and %r also allow explicitly defining the separator; eg %.i or %_r. Dot/period (.), dash (-), and underscore (_) are the only characters supported since DNS names may not contain most other non-alphanumerics.
%blank% may be used to specifically prevent template expansion on a segment of a block if desired; eg, if 192.168.23.0/24 has "unused-%i.example.com" set, adding an A+PTR template for 192.168.23.48/30 of "%blank%" will leave 192.168.23.48 through .51 without PTR records unless specific entries exist for those IPs.
Per-octet patterns (1, 2, 3, or 4 specify the octet; d, h or 0 specify decimal, hexidecimal, or 0-padded decimal)
First octet, decimal	%1d	192
Third octet, 0-padded	%30	023
Fourth octet, hexidecimal	%4h	2d
All octets, different expansions	%1h-%2d-%30-%4h	c0-168-023-2d
Extensions
	Substitution pattern	Example expansion using 192.168.23.40/29
Network/ gateway/ broadcast	%ngb%	customer-%i%ngb%.example.com 192.168.23.40 -> customer-net.example.com 192.168.23.41 -> customer-gw.example.com 192.168.23.42 -> customer-192-168-23-42.example.com 192.168.23.43 -> customer-192-168-23-43.example.com 192.168.23.44 -> customer-192-168-23-44.example.com 192.168.23.45 -> customer-192-168-23-45.example.com 192.168.23.46 -> customer-192-168-23-46.example.com 192.168.23.47 -> customer-bcast.example.com
Any IP pattern component is blanked on the network, gateway, and broadcast IPs when this is used. Each of n, g, or b can be prefixed with a dash, eg %-ng-b% or %n-g-b%, which will blank that entire entry instead of substituting net, gw, or bcast.
n'th usable IP	%c	customer-%3d-%c.example.com 192.168.23.40 -> customer-23.example.com 192.168.23.41 -> customer-23.example.com 192.168.23.42 -> customer-23-1.example.com 192.168.23.43 -> customer-23-2.example.com 192.168.23.44 -> customer-23-3.example.com 192.168.23.45 -> customer-23-4.example.com 192.168.23.46 -> customer-23-5.example.com 192.168.23.47 -> customer-23.example.com
c can be prefixed with a dash (%-c), which starts the numbering from the conventional gateway IP instead. (.41 above would be 1, .42 2, etc, finishing with 6 at .46).