What it means
Nameservers are the servers that answer the question of where a domain points. When somebody types your name, their computer asks the nameservers on record, and those servers reply with the address of the hosting, the email provider, or the sales lander. The registration says who owns the name; the nameservers say what it currently does. They are set in the registrar control panel and can be changed at any time in minutes.
Not the same as a transfer
This is the distinction that causes the most confusion in a domain sale. A registrar transfer moves the registration itself and changes who controls the name, takes days, and requires an auth code. A nameserver change only redirects where the name resolves, takes minutes, and requires nothing but access to the control panel. A buyer asking you to point nameservers at their hosting has not asked for ownership, and a buyer who already has ownership does not need you to change anything.
Why they affect what you earn
Several domain marketplaces price by how the sale completes, and pointing a name at their aftermarket nameservers is what lets them transfer it instantly to a buyer. Because that removes the friction, they charge less for it. On Afternic the Basic-plan commission is 25% by default and 15% with their nameservers configured, which on a five-figure sale is a large amount of money for a settings change. If you list a name for sale, check whether your venue prices this way before you do anything else.
What to check before listing
Confirm the nameservers are ones you control, or ones your selling venue asked for, rather than left over from hosting you cancelled years ago. A name pointing at dead hosting shows a browser error to anyone who types it, which includes every potential buyer who wanted to see whether the name was in use. Pointing an idle name at a simple for-sale lander is the cheapest thing you can do to make it sellable.
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