[dsl]

Sorry, but I call shenanigans on your having operated a large scale network.

Every carrier worth its salt will already let you use blackhole communities to mitigate attacks. You tag it, it gets dropped at the edge of your upstreams networks. Simple and effective. You don't need a web service or middleware for any of this.

Also, a route and netmask (generally) take exactly the same amount of memory regardless of the size of the network you're covering.

[toomuchtodo]

If you want to meet me at the next NANOG conference, I can send you my personal email address to get in touch.