Biggest installation of ISC DHCP?

David W. Hankins David_Hankins at
Fri Jan 18 22:26:40 UTC 2008

On Fri, Jan 18, 2008 at 11:59:31AM +1100, Nick Urbanik wrote:
> I'd like to ask if there are any installations of ISC DHCP bigger than
> ours.  We have:
> 2,239,396 distinct addresses for PCs;

the highest bog-standard sort of dynamic DHCP i'm familiar with is
2,947,035 addresses in a single failover server pair.

> Is anyone aware of a bigger ISC DHCP installation anywhere?  I have
> been told that we may have the biggest installation in the world, but
> would like to know if there are others bigger.

excluding failover or single servers, i am familiar with a network i
can't name which does not connect directly to the Internet, and is
forced due to sheer size to allocate more addresses than will fit in
the entire combined total of RFC1918 spaces.

which would put it well in excess of the ~16.5 million addresses that
10-net offers.

i'm pretty sure they use an array of systems, and quite a lot of
fixed-addresses in host records (very big performance gains at this
scale, it saves them a lot of money in uber-hardware) which aren't
very cumbersome for them because systems must be 'blessed' to get
onto the network the mac is recorded.

but you know what they say, "there are stranger things in heaven and

i'd like to mention that ISC does provide commercial support for DHCP,
and some of the support packages include time to help with system
architecture and design.  we have a few customers at that general
performance envelope.

Ash bugud-gul durbatuluk agh burzum-ishi krimpatul.
Why settle for the lesser evil?
David W. Hankins	"If you don't do it right the first time,
Software Engineer		     you'll just have to do it again."
Internet Systems Consortium, Inc.		-- Jack T. Hankins

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