- Already delegated TLDs
- gTLD strings that were applied for in previous gTLD rounds and whose applications are still being processed
- Existing Country Code Top-Level Domains (ccTLDs)
- Strings currently requested as IDN ccTLDs
- All other one- or two-letter ASCII strings
- Strings on the Blocked Names list
- Strings on the Reserved Names list (unless the applicant is qualified to use the exception process to apply for a limited international IGO-INGO name)
- Closed Generics
Which types of strings are not permitted to be applied for?
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