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NetReg is a DNS & DHCP management system (and much more) that we wrote in 
house to replace our previous database. We manage DNS & DHCP for 50K 
machines, and NetReg does it all. It is available under an OSS license and 
is in use at several other locations. NetReg provides a self service web 
interface with flexible permissions, privilege delegation, IP address space 
management, DNS record validation, and more.  For information visit 
http://www.net.cmu.edu/netreg

As the current primary developer of the system I'm a bit biased, but I 
think its a great system. It has a steep learning curve, and the 
documentation leaves something to be desired (like a tech writer...), but 
once you hit a certain scale the benefits outway the cost. On the site 
linked above you'll find a working demo with some base data you can 
experiment with, but obviously the full power of the system isn't utilized 
until you have lots of data and can see the resulting zones & config files.

There is an active mailing list. Feel free to join it and ask questions. 
https://lists.andrew.cmu.edu/mailman/listinfo/netreg-users

Disclaimer: In addition to being the current primary developer,  I also 
offer installation, customization and support contracts on the side.