You asked about Aerospace
10 people built something like it. 0 are gone.
That is 0% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2024-06-01 | YCEntangl Find & resolve issues in data center engineering & operations using AI · entangl.com | still up |
| 2024-06-01 | YCVendra Custom Parts, Manufactured in America 🇺🇸 · vendra.io | still up |
| 2024-01-01 | Agent-Driven Engineering · navier.ai | still up |
| 2024-01-01 | YCBasalt Constellations as a Service · basalt.space | still up |
| 2024-01-01 | YCElodin Unified flight software and hardware for the mission of tomorrow · elodin.systems | still up |
| 2024-06-01 | YCSorcerer Building a nervous system for the atmosphere · sorcerer.earth | still up |
| 2024-06-01 | Building low-cost cruise missiles · aresindustries.com | still up |
| 2024-09-01 | AI that gets aircraft flying faster · tryforerunner.com | still up |
| 2024-09-01 | YCConsus The fastest and cheapest way to use AI with ITAR or CUI data. · consus.io | still up |
| 2024-06-01 | In-Space Refueling · spaceium.com | still up |
How this compares
The register re-probes every domain it holds. Some that answered last month stop answering. We send that list — what went quiet, and what it was — once a month. Nothing else.
How this was made. Show HN entries are every post from 2021 to 2023 with at least five points that linked to its own domain; code hosts and free hosting are excluded, because a repository outlives the effort behind it. Product Hunt entries needed 100 votes — a far higher bar, so they are the promoted top slice rather than a like-for-like sample. Both are judged by asking the domain whether it still answers: gone means it no longer resolves, refuses the connection, serves a parking page, or says plainly that it shut down. An HTTP error is not counted as gone — a server answering 404 is one somebody still pays for, and an audit of 25 gone-calls found two such sites alive with only a moved homepage. Y Combinator entries use the status YC publishes itself, which is why only those can say acquired. Squatted domains — a lapsed name now serving somebody else's site — are not detected, so these figures run slightly low.