Many existing products are capable of using DNSBLs (DNS Black Lists) and DNSWLs (DNS White Lists). This includes many email and other security products. Karmasphere can be used with these products by configuring them to use a Karmasphere feedset via its DNS zone. Verify how to do this in the product documentation for your specific set-up then consult the DNSBL Quick Start Guide.
See also: Why do you need my IP addresses?Client libraries are available in C, Perl, Java, and Ruby. You are, of course, welcome to implement a BQuery library in the language of your choice.