Yes, just login to your account at your host's website and see what packages you have running with them. If you have lost your login information, I see a forgot password link that may help. Or just contact Bright-Byte.
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Host would normally include your domain name on their invoice. And how many domains do you have that are hosted by different hosts? It sounds like you have thousand of domains and thousand of hosting accounts
Just drop your host an email and they should be able to tell you what domain(s) you have hosted with them.