Non-Octet Boundary Delegation (RFC 4183)

Simon Hobson dhcp1 at
Thu Sep 22 06:58:40 UTC 2011

A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?

Stas wrote:
>Thank you Simon, thank you Andris.
>Andris, problem is that in that case I will need to use "nslookup
> instead of "nslookup" to
>get DNS record.

You **ALWAYS** lookup by the normal IP - eg dig -x
That results in a lookup of

The trick is that instead of that being a PTR to some FQDN, it is a 
pointer to
Ie, in the zone there'll be a record
68 PTR

Then in the zone, you have an entry dynamically 
created by DHCP which is " PTR <some fqdn>".

It's some time since I played with this, but I recall it "just works" 
- looking again at RFC 4183, I certainly didn't do it that way. But 
I'm happy to be corrected if I'm wrong.

Simon Hobson

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author Gladys Hobson. Novels - poetry - short stories - ideal as
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