IPv6 Assignment Tracking Software

[Devon True]

All:

How are people tracking their IPv6 assignments to customers? Using 3rd
party software, spreadsheets, or just based off the router
configuration? We currently use NorthStar for our IPv4 tracking but it
does not support IPv6 (and some people are not happy with NorthStar). I
looked at IPPlan, but found that I could not easily assign IPv4 subnets
to customers without pre-allocating them as "free".

I also found a few commercial programs like Diamond IP, Easy-IP, or QIP
and I was hoping I could get any opinions on them.

My ideal software would include the following:

o Ability to track IPv4 and IPv6 addresses
o A DB that we can import and export data to/from (postgres or mysql
preferred)
o A web interface
o Ability to find IPv4 subnets easily (e.g. I have a /20, find me the
next available /28 without having to pre-allocate /28s for use)
o Robust search engine
o Built-in rwhois is a bonus

Thanks!

--
Devon