No, I think he means longer. IN-ADDR.ARPA can only be delegated on octet
boundaries, so IN-ADDR for /16 and shorter prefixes will be delegated in /16
chunks. IN-ADDR for prefixes longer than /16 must still be maintained by the
root, since they cannot be delegated.
For example, assume an ISP has been allocated the prefix 204.160/14. Along with
this, the InterNIC will delegate the corresponding IN-ADDR domains:
If the ISP were instead only assigned 204.160.0/17, the associated IN-ADDR
range would be:
which is not octet-aligned and therefore cannot be delegated.
Well, you can delegate these as 128 individual zones. With a little
bit of automation to help, it may approach practical. You can
delegate a single domain name in the limiting case.
Louis A. Mamakos, Manager of Network Engineering email@example.com, uunet!louie
UUNET Technologies, Inc. Voice: +1 703 206 5823
3060 Williams Drive Fax: +1 703 206 5908
Fairfax, VA 22031