.com remains the most-clicked TLD on cold inbound traffic in 2026 (Verisign 2024 data). .io is acceptable for developer tools and B2B early stage. .ai commands a premium and reads as authentic only for AI-native brands. Country-code TLDs like .co or .so work as creative endings (notion.so, t.co) but require a registrar that handles ccTLD policies. The Namecheap link on each name card lets you compare TLDs at the same registrar.
Color glossary
TLD
Top-Level Domain. The final segment of a domain name, like .com, .io, or .ai.
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Portmanteau
A new word made by combining parts of two existing words.
NXDOMAIN
A DNS response code that indicates a queried domain name does not exist in the zone.
DoH (DNS over HTTPS)
A protocol that performs DNS lookups over an HTTPS connection rather than plain UDP.
Premium Domain
A domain priced above the standard registration fee, typically because the registry or registrar has reserved it.
Trademark Class
A category in the Nice Classification system used to scope trademark registrations.
Common-Law Trademark
Trademark rights that arise from actual use in commerce, without federal registration.