You asked about Security
Nobody in the register described anything this way.
| Launched | What it was | Today |
|---|---|---|
| 2012-01-01 | YCAuthy Authy is a Two-Factor Authentication platform for developers · authy.com | acquired |
| 2018-01-01 | YCSqreen Sqreen is the application security platform for the modern enterprise · sqreen.com | acquired |
| 2020-06-01 | YCSafeBase Trust Center platform that scales customer security reviews · safebase.io | acquired |
| 2010-06-01 | YCAeroFS Secure Enterprise Collaboration. · aerofs.com | acquired |
| 2015-06-01 | Shifting the asymmetry of cyber security. · cymmetria.com | acquired |
| 2017-06-01 | Protecting applications from malicious activity · templarbit.com | acquired |
| 2015-01-01 | YCSmyte Smyte stops bad actors on social networks and marketplaces. · smyte.com | acquired |
| 2015-01-01 | YCFinal A credit card that drastically reduces payment fraud and gives… · getfinal.com | acquired |
| 2014-01-01 | We're making a smart, front door camera with intercom that lets you… · getkuna.com | acquired |
| 2005-06-01 | clickfacts.com | acquired |
| 2015-06-01 | YCFoxpass Making enterprise security practices available for all companies. · foxpass.com | acquired |
| 2021-06-01 | YCTarsal Data pipeline for your security data lake. · tarsal.co | acquired |
| 2020-06-01 | YCVectrix Scan your SaaS apps and instantly identify security issues · vectrix.io | acquired |
| 2021-06-01 | YCTelivy Automate your cyber security risk assessments · telivy.com | acquired |
| 2021-06-01 | YCKeyri Secure fraud prevention and authentication platform for developers · keyri.com | acquired |
| 2023-01-01 | YCEdgeBit Autofix your software dependencies · edgebit.io | acquired |
| 2021-01-01 | YCStacksi Automated Answers to Security Questionnaires · stacksi.com | acquired |
| 2011-06-01 | Server key management, VPN as a Service, Privacy VPN. Sold to… · cryptoseal.com | acquired |
| 2023-06-01 | YCXeol Close your outdated dependency attack vector · xeol.io | acquired |
| 2015-06-01 | sphere.works | acquired |
| 2013-01-01 | YCMeldium Simple password & identity management for teams. Acquired by LogMeIn… · meldium.com | acquired |
| 2022-01-01 | YCJumpWire Dynamic access controls for all data and databases · jumpwire.io | acquired |
| 2015-06-01 | Appcanary tracks the dependencies you use in your apps and servers… · appcanary.com | acquired |
| 2015-01-01 | Cyberfend delivers robust, real-time web and mobile security by… · cyberfend.com | acquired |
| 2018-01-01 | YCHunter2 Hunter2 trains engineering teams in application security through… · hunter2.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.