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SpaceXSI.com sold for $174,000. Did Elon Musk really buy it?

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Key facts (as of 8 October 2026)

  • SpaceXSI.com was reported sold for $174,000 on 7 October 2026 through the Spaceship marketplace.
  • The sale was announced by the @domain account on X, which named Elon Musk as the buyer.
  • Neither Musk nor SpaceX has confirmed the purchase.
  • The domain was registered on 25 July 2025, reportedly for about $10.
  • It's a .com, not a .si. But it sold because of the AI → SI naming shift.

Short answer: the sale looks real, but Musk being the buyer is not confirmed. Treat it as a reported sale until Musk, SpaceX or a registry record says otherwise.

What happened

On 7 October 2026, the @domain account on X posted that SpaceXSI.com had sold through Spaceship, tagging Elon Musk as the buyer. Two days earlier, the domain was still publicly listed on Spaceship with a $174,888 "Buy Now" price.

Post by @domain on X, 7 Oct 2026: SpaceXSi.com sold for $174,000 USD via Spaceship to @elonmusk
Screenshot of a post by @domain on X, 7 October 2026. Profile photo blurred. View the original post →

NoteThis is an announcement from the sale side, not from Musk or SpaceX. Domain sale announcements are sometimes accurate and sometimes promotional. We'll update this post if the buyer is confirmed.

Why SpaceXSI.com suddenly mattered

Three days before the sale, Musk replied to an X user who asked about renaming SpaceXAI, the AI business behind Grok, to SpaceXSI:

That reply followed a US executive order signed on 29 September 2026 that directs federal agencies to say "Super Intelligence" (SI) instead of "Artificial Intelligence" (AI). Musk gave no date for the rename and has not said whether it's a legal name change or just branding. Once a company publicly commits to a name, the exact-match .com becomes very valuable overnight.

Timeline: from a $10 registration to a $174,000 sale

[TIMELINE] SPACEXSI.COM · JUL 2025–OCT 2026

From a $10 registration to a $174,000 sale

  1. Registered

    SpaceXSI.com registered

    No SpaceXSI company existed yet. TechStartups

  2. UN speech

    Trump at the UN

    Trump tells the UN General Assembly that artificial intelligence should be called super intelligence. Reuters

  3. Executive order

    “SI” for federal agencies

    Executive order directs federal agencies to use SI. TechCrunch

  4. Musk replies

    The SpaceXSI rename

    Musk: Yes, we will make that change on the SpaceXSI rename. Reuters

  5. Still for sale

    Listed at $174,888

    SpaceXSI.com still listed on Spaceship at $174,888. TechStartups

  6. Reported sale

    Sale announced, buyer unconfirmed

    @domain announces the sale at $174,000, naming Musk. X

Confirmed vs not confirmed

What we know about the SpaceXSI.com sale, as of 8 October 2026
ClaimStatusSource
Musk said SpaceXAI will become SpaceXSIConfirmed (his own X reply)Reuters
US executive order on "Super Intelligence"ConfirmedTechCrunch
SpaceXSI.com was listed at $174,888ReportedTechStartups
SpaceXSI.com sold for $174,000Reported by a seller-side account@domain on X
The buyer is Elon MuskNot confirmedNo statement from Musk or SpaceX
A date for the SpaceXSI rebrandNone givenReuters

The .si boom in numbers

The SpaceXSI.com sale is part of a wider rush on anything "SI", and the biggest effect has been on .si, Slovenia's country domain.

New .si domain registrations per month, August and September 2026 Bar chart. August 2026: 3,515 new .si registrations. September 2026: 46,066 new .si registrations.
New .si registrations per month. Sources: Domain Name Wire via 101domain (August), registry figures via OfficeChai (September).
  • About 3,515 new .si domains were registered in all of August 2026.
  • About 46,066 were registered in September 2026, after the "SI" push began.
  • Total .si registrations have now passed 220,000.

The executive order only applies to US federal agencies. Nothing in it requires companies to rename themselves. Whether "SI" sticks in everyday use is still an open question.

Frequently asked questions

Did Elon Musk buy SpaceXSI.com?

Not confirmed. The @domain account on X said it sold to Musk via Spaceship, but as of 8 October 2026, Musk and SpaceX have not confirmed the purchase.

How much did SpaceXSI.com sell for?

It was reported sold for $174,000 on 7 October 2026. Two days earlier it was listed on Spaceship with a $174,888 Buy Now price.

Is SpaceXAI now called SpaceXSI?

Not yet officially. On 4 October 2026, Musk said "Yes, we will make that change," but he gave no date, and the company's accounts still used the SpaceXAI name at the time.

Is SpaceXSI.com a .si domain?

No. SpaceXSI.com is a .com domain. ".si" is Slovenia's country domain, which has become popular because "SI" now stands for superintelligence.

Where can I check if a .si domain is available?

Use the .si availability checker, or browse .si domains for sale. New to .si? Read the .si domain guide.

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Related: Elon Musk says "No more AI. SI." Here's what it means for .si domains

Sources

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