isc bind$GENERATE directive is available in multi platform DNS server BIND since 8.2 version. It helps you to create hundreds or thousands of resource records with one line in zone file.

Nice example is to use $GENERATE in order to make PTR records for certain DNS zone.

Let’s assume that subnet is reserved for use by a DHCP server pool, in this case reverse lookup (PTR) records should like (where # is the number from 1 to 254) can be created with the following lines in the zone file:

253 IN PTR
254 IN PTR

or with with single line:

$GENERATE 1-254 $ PTR dhcp-$

Wide explanation of this directive you can find here.

P.S. From Wikipedia for newbies:

A PTR record or pointer record maps an IPv4 address to the canonical name for that host. Setting up a PTR record for a hostname in the domain that corresponds to an IP address implements reverse DNS lookup for that address. For example (at the time of writing), has the IP address, but a PTR record maps to its canonical name,




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