How can I check if ESN is clear online?

I'm planning to buy phones from eBay and if I do it over customer service it gets annoying. Verizon phonesHow can I check if ESN is clear online?
You can't, really. The only thing you can do is go on vzw.com and actually change your esn to the one you want to check, but since you don't have that phone in hand to program it won't do any good. Just call into customer service, tell them what you need, and be nice to the person helping you.How can I check if ESN is clear online?
How many phones are you planning to buy? If you're starting a used phone business, maybe Verizon can tell you if there's an easier way to check them.