2008.02.20 NANOG 42 IPv4 PTR queries for unallocated space

Thu Feb 21 09:51:39 UTC 2008

On 20 feb 2008, at 20:27, <michael.dillon at bt.com>  
<michael.dillon at bt.com> wrote:

>> 2/8, 1/8, 23/8, 5/8, 100/8 is there at #5, which is odd.

> Odd? It's a round number which probably means that more
> than one person has picked it when they needed to make
> up an IP address.

It would be interesting to know how much of this space is really used  
for something more or less permanent, and how much is just random  
noise. For instance, I do a training course where people need to  
configure routers, and I use addresses out of 96.0.0.0/8 for that,  
because it has to be clear that we're talking about real addresses and  
not RFC 1918 stuff. Although this doesn't interact with the real  
internet, often, people end up having real addresses and also  
96.0.0.0/8 addresses on their laptops so they probably generate some  
DNS queries for the 96 range.

Would it be useful for IANA to publish the order in which they're  
going to allocate /8s? That way, it's easier for people to plan  
getting out of the way of real deployment in time.