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Under .xxx.mem

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BreadcrumbHome.xxx.memSub-level domains

.xxx.mem

The literal root .mem is not in the current IANA delegation list

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Questions

What does an empty list under .xxx.mem mean?

No child extensions match the current filters. It does not establish that the parent has no delegated or historically used child namespaces.

Does a parent extension’s price apply to its children?

No. A child suffix is a separate namespace for pricing, eligibility, and availability evidence.

.xxx.mem second-level domains & rules | tld.wiki