You asked about Sustainable Tourism
Nobody in the register described anything this way.
| Launched | What it was | Today |
|---|---|---|
| 2012-06-01 | YCVayable We're building a marketplace for unique travel experiences (it's… · vayable.com | acquired |
| 2009-01-01 | YCAirbnb Book accommodations around the world. · airbnb.com | acquired |
| 2020-06-01 | YCMomence Scheduling and payments for experiences · momence.com | acquired |
| 2013-01-01 | VaycayHero is a marketplace of professionally managed vacation… · vaycayhero.com | acquired |
| 2010-06-01 | YCHipmunk Hipmunk takes the agony out of searching for flights, accommodations,… · hipmunk.com | acquired |
| 2007-06-01 | YCSongkick songkick.com | acquired |
| 2017-06-01 | YCSolve We save travelers hours by meeting them at their arrival gate,… · solve.com | acquired |
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.