[ris-int] Length of time an arbitary range has been announced in an arbitary time period

I'm after a nifty interface which will tell me the following: For a given IP range (note, not prefix), for how long has prefixes that cover said range been announced within an arbitary time period. Eg, say I want to see how long IP address 1.2.3.4 has been announced in the last month. I want to be able to say: Show me time announced for 1.2.3.0/24 or less-specific between 1 Oct and 31 Oct. Do we have something like this? --==-- Bruce.