Finding out which searXNG instances exist is easily possible via https://searx.space/
Finding out for how long they exist is harder. I aggregated data from archive.org get that information.
I got them via https://web.archive.org/web/20230801000000*/https://searx.space/data/instances.json (for each year: one file for March, June, September and December)..
The 1st value is the instance URL, the 2nd value is the age of the instance (in years), rounded to 0.25 steps.
- https://searx.tuxcloud.net/, 4.5 years
- https://www.gruble.de/, 4.5 years
- https://search.mdosch.de/, 4.5 years
- https://searx.be/, 4.25 years
- https://searx.dresden.network/, 3.75 years
- https://darmarit.org/searx/, 3.25 years
- https://northboot.xyz/, 3 years
- https://searx.tiekoetter.com/, 2.75 years
- https://paulgo.io/, 2.75 years
- http://4n53nafyi77iplnbrpmxnp3x4exbswwxigujaxy3b37fvr7bvlopxeyd.onion/, 2.75 years
- https://sx.catgirl.cloud/, 2.75 years
- https://search.bus-hit.me/, 2.5 years
- https://search.ononoki.org/, 2.5 years
- https://searx.namejeff.xyz/, 2.25 years
- https://etsi.me/, 2.25 years
- https://searx.sev.monster/, 2.25 years
- http://searx3aolosaf3urwnhpynlhuokqsgz47si4pzz5hvb7uuzyjncl2tid.onion/, 2.25 years
- https://priv.au/, 2 years
- https://opnxng.com/, 2 years
- https://search.sapti.me/, 2 years
- https://search.rowie.at/, 2 years
- https://search.rhscz.eu/, 1.75 years
- https://searx.work/, 1.75 years
- https://ooglester.com/, 1.75 years
- https://searx.oakleycord.dev/, 1.75 years
- https://search.smnz.de/, 1.75 years
- https://search.projectsegfau.lt/, 1.75 years
- https://searx.juancord.xyz/, 1.75 years
- https://s.trung.fun/, 1.75 years
- https://baresearch.org/, 1.5 years
- https://search.leptons.xyz/, 1.5 years
- https://search.im-in.space/, 1.25 years
- https://search.inetol.net/, 1 years
- https://searx.zhenyapav.com/, 1 years
- https://searx.daetalytica.io/, 1 years
- https://search.citw.lgbt/, 1 years
- https://searx.ox2.fr/, 1 years
- https://searxng.ch/, 1 years
- https://copp.gg/, 1 years
- http://search.pjsfkvpxlinjamtawaksbnnaqs2fc2mtvmozrzckxh7f3kis6yea25ad.onion/, 1 years
- https://searx.perennialte.ch/, 1 years
- https://search.hbubli.cc/, 0.75 years
- https://nyc1.sx.ggtyler.dev/, 0.75 years
- https://s.mble.dk/, 0.75 years
- https://searx.rhscz.eu/, 0.5 years
- https://searx.ro/, 0.5 years
- https://searxng.site/, 0.5 years
- https://searx.aleteoryx.me/, 0.5 years
- http://searxwcao6avdvuaspdrjheiwrcey2zvxq3dj52gruo3oaqcr2ddlyqd.onion/, 0.5 years
- https://search.nadeko.net/, 0.5 years
- https://searx.lunar.icu/, 0.5 years
- https://search.privacyredirect.com/, 0.5 years
- https://searx.hu/, 0.25 years
- https://search.indst.eu/, 0.25 years
- https://searx.colbster937.dev/, 0.25 years
- https://search.charliewhiskey.net/, 0.25 years
- https://skyrimhater.com/, 0.25 years
- https://fairsuch.net/, 0.25 years
- https://search.ngn.tf/, 0.25 years
- https://search.incogniweb.net/, 0.25 years
- https://search.nerdvpn.de/, 0.25 years
- http://lbmegc3rjnekmdxuisynqdc7y3m2tgyq7gj257ooddaobxqjw36bdayd.onion/, 0.25 years
- https://search.einfachzocken.eu/, 0.25 years
- http://nerdvpn4iln4didgzcw7pgvjv4p3pwn3e3dq732oxwidfv6bacnyuvad.onion/, 0.25 years
- https://sx.thatxtreme.dev/, 0.25 years
- https://sx.zorby.top/, 0 years
- https://search.blitzw.in/, 0 years
- https://search.tommy-tran.com/, 0 years
- https://seek.fyi/, 0 years
- https://search.nordh.tech/, 0 years
- https://search.fredix.xyz/, 0 years
- https://searx.thefloatinglab.world/, 0 years
- https://searx.foss.family/, 0 years
- https://searx.electroncash.de/, 0 years
- https://nogoo.me/, 0 years
- https://searxng.hweeren.com/, 0 years
- https://searxng.shreven.org/, 0 years
- http://3cvltarlpeanooabgva7tbmtlzznyr3ltsndvwtngwuzqtvwyllaz4qd.onion/, 0 years