To:
dnsop@cafax.se
From:
"D. J. Bernstein" <djb@cr.yp.to>
Date:
11 Feb 2000 22:05:39 -0000
Sender:
owner-dnsop@cafax.se
Subject:
Re: latest Internet Domain Survey
April Marine writes: > The latest count shows more than 72 million hosts, My survey in December (http://cr.yp.to/surveys/dnsptr2.txt) showed that roughly 84 million IP addresses had PTR records. There are now close to 90 million. One virtue of this measurement is that anyone can statistically verify it in a matter of minutes. Download the DNScache package from http://cr.yp.to/dnscache.html, replace BIND (which is too unstable for a big survey) with dnscache, and run random-ip 10000 | softlimit -o 500 dnsfilter -c 100 -l 10000 > PTR Then ``grep = PTR | wc'' will be the number of PTR records found out of 10000 IP addresses. For a slower but more comprehensive survey, change the first 10000 to 100000 or 1000000. For extra speed, eliminate silly addresses. ---Dan