Hmm. Tor onion addresses are generally super long and have a large random element to them, such as facebookwkhpilnemxj7asaniu7vnjj.onion where the "Facebook"

Hmm. Tor onion addresses are generally super long and have a large random element to them, such as facebookwkhpilnemxj7asaniu7vnjj.onion where the "Facebook" part is there for convenience and may likely not be present for actual illegal addresses. As such, you probably won't be able to find a CP website unless you actively brute force the entire onion address space. I don't know how the sharing actually happens, but I don't think a real search engine for the dark net exists. There are websites that try (Ahlia, I think?) but they are super limited in scope. I suspect addresses for drugs and CP are shared person-to-person.