How can I check whether a certain SMM panel is a JAP reseller or if they resell from a different site?

I've used JAP for some time and decided to use other panels. So, I tried some of the SMM panels from the marketplace section. Most of them are JAP resellers, right? How can I find a panel that resells from another site so I can test new services? Is checking the nameserver on WHOIS the way?

YTP said:

Is checking the nameserver on WHOIS the way?

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No, because most of the panels are under perfectpanel DNS, so even if they are on the same DNS it dosent mean they resell from each other.