[LINK] IPv4 host density measured by ping
rw at firstpr.com.au
Thu Mar 1 14:25:49 EST 2007
Here are some other /24 prefixes nominated by people who wrote to me
126.96.36.199/24 Internode 35 acks
Only has a few reverse-mapped names:
188.8.131.52/24 Internode - "dynamic" I am told. 93 acks
All reverse mapped in the form of:
I think Netcraft only surveys web servers:
The last ping survey I know of was in 1999.
This was not a random scan of the Net, as I did - though I also scanned
particular /8 prefixes, and sets of BGP prefixes of different lengths.
They scanned the DNS for hostnames with IP addresses (mainly web server
names, I guess) and then pinged those IP addresses.
| Survey Adjusted Replied
Date | Host Count Host Count To Ping*
Jul 2006|439,286,364 -
Jan 2006|394,991,609 -
Jan 1999| 43,230,000 8,426,000
[* estimated by pinging a sample of all hosts]
I don't know of any ping surveys, so wrote software to do my own.
I know pings are a limited indication of IP address space usage. I
guess they generally give a lower bound.
I recognise this doesn't count the number of computers behind a NAT
firewall - I am not attempting to count those.
I wanted a rough estimate of how many IP addresses are genuinely being
used at present. I also wanted to find trends in IP address
utilisation. For instance, I found the 19 big /8 prefixes advertised in
BGP being very poorly utilised, if 0.2% ping responses is anything to go
by, when others are more like 10 or 20%.
- Robin http://www.firstpr.com.au/ip/host-density-per-prefix/
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