# stun.syncthing.net doesn't resolve anymore
**URL:** https://forum.syncthing.net/t/stun-syncthing-net-doesnt-resolve-anymore/24075
**Category:** General
**Created:** [March 30, 2025, 4:31am UTC](https://forum.syncthing.net/t/stun-syncthing-net-doesnt-resolve-anymore/24075 "2025-03-30T04:31:08Z")
**Posts on this page:** 14
**Page:** 1
### Author:  [@marbens](https://forum.syncthing.net/u/marbens)
#### Post date: [March 30, 2025, 4:31am UTC](https://forum.syncthing.net/t/stun-syncthing-net-doesnt-resolve-anymore/24075/1 "2025-03-30T04:31:08Z")
Syncthing’s STUN server used to have the domain of [stun.syncthing.net](http://stun.syncthing.net), but that doesn’t resolve to anything anymore.
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### Author:  [@calmh](https://forum.syncthing.net/u/calmh)
#### Post date: [March 30, 2025, 7:42am UTC](https://forum.syncthing.net/t/stun-syncthing-net-doesnt-resolve-anymore/24075/2 "2025-03-30T07:42:05Z")
I shut it down because keeping it running wasn’t feasible under the circumstances.
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### Author:  [@bt90](https://forum.syncthing.net/u/bt90)
#### Post date: [March 30, 2025, 7:48am UTC](https://forum.syncthing.net/t/stun-syncthing-net-doesnt-resolve-anymore/24075/3 "2025-03-30T07:48:57Z")
Context: [STUN server misuse](https://forum.syncthing.net/t/stun-server-misuse/23319)
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### Author:  [@calmh](https://forum.syncthing.net/u/calmh)
#### Post date: [March 30, 2025, 8:46am UTC](https://forum.syncthing.net/t/stun-syncthing-net-doesnt-resolve-anymore/24075/4 "2025-03-30T08:46:02Z")
To add to what happened after; traffic kept growing and blocking didn’t help much since it’s UDP and clients keep trying. I think we were up to 200 Mbps of incoming UDP when I dropped the A record. So whatever we end up doing in the future, `stun.syncthing.net` is probably permanently burned as a name.
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### Author:  [@bt90](https://forum.syncthing.net/u/bt90)
#### Post date: [March 30, 2025, 9:42am UTC](https://forum.syncthing.net/t/stun-syncthing-net-doesnt-resolve-anymore/24075/5 "2025-03-30T09:42:08Z")
A public STUN server with a fixed domain will always end up on lists like [this](https://gist.github.com/mondain/b0ec1cf5f60ae726202e). The only viable defense is to switch to a different domain from time to time.
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### Author:  [@calmh](https://forum.syncthing.net/u/calmh)
#### Post date: [March 30, 2025, 12:20pm UTC](https://forum.syncthing.net/t/stun-syncthing-net-doesnt-resolve-anymore/24075/6 "2025-03-30T12:20:22Z")
Yeah… And I’m the first to recognise the irony/hypocrisy of on the one hand decrying non-Syncthing clients using our STUN server and on the other hand now just relying on other people’s public STUN servers…
A hardcoded auth credential might help a bit, at least as a clear official discouragement.
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### Author:  [@bt90](https://forum.syncthing.net/u/bt90)
#### Post date: [March 30, 2025, 2:21pm UTC](https://forum.syncthing.net/t/stun-syncthing-net-doesnt-resolve-anymore/24075/7 "2025-03-30T14:21:44Z")
STUN with authentication requires a bit of effort. This should be enough to discourage the laziest of abusers.
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### Author:  [@bt90](https://forum.syncthing.net/u/bt90)
#### Post date: [March 31, 2025, 9:15pm UTC](https://forum.syncthing.net/t/stun-syncthing-net-doesnt-resolve-anymore/24075/8 "2025-03-31T21:15:28Z")
Showerthought: resolving the actual STUN server address via a DNS SRV record might also be an alternative. It’s three lines of code in go, but renders the server pretty much unusable for any browser WebRTC stuff
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### Author:  [@bt90](https://forum.syncthing.net/u/bt90)
#### Post date: [June 24, 2025, 6:34am UTC](https://forum.syncthing.net/t/stun-syncthing-net-doesnt-resolve-anymore/24075/9 "2025-06-24T06:34:28Z")
@calmh any plans to revive the STUN server in the near future?
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### Author:  [@calmh](https://forum.syncthing.net/u/calmh)
#### Post date: [June 24, 2025, 7:27am UTC](https://forum.syncthing.net/t/stun-syncthing-net-doesnt-resolve-anymore/24075/10 "2025-06-24T07:27:49Z")
I have a bit too much on plate already for work and personal reasons and this doesn’t feel like a priority. I can spin up a VM and point a couple of IP addresses to it if you want to do the needful and take it from there, though.
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### Author:  [@bt90](https://forum.syncthing.net/u/bt90)
#### Post date: [June 24, 2025, 1:58pm UTC](https://forum.syncthing.net/t/stun-syncthing-net-doesnt-resolve-anymore/24075/11 "2025-06-24T13:58:32Z")
Feel free to postpone 🙂
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### Author:  [@Jeff-Bouchard](https://forum.syncthing.net/u/Jeff-Bouchard)
#### Post date: [July 19, 2025, 12:50am UTC](https://forum.syncthing.net/t/stun-syncthing-net-doesnt-resolve-anymore/24075/12 "2025-07-19T00:50:38Z")
normies forget blockchain DNS EmerDNS the project that brought STUN to blockchains all around; the idea is to use a random one on a list of many servers. here’s the official emercoin list : [emercoin/src/gen-stun-list.c at master · emercoin/emercoin · GitHub](https://github.com/emercoin/emercoin/blob/master/src/gen-stun-list.c) you are welcome
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### Author:  [@marbens](https://forum.syncthing.net/u/marbens)
#### Post date: [July 19, 2025, 1:25am UTC](https://forum.syncthing.net/t/stun-syncthing-net-doesnt-resolve-anymore/24075/13 "2025-07-19T01:25:37Z")
> [@Jeff-Bouchard](#):
>
> the idea is to use a random one on a list of many servers.
I think we already do that? Although official servers are preferred when they’re available, to avoid putting burden on 3rd-party infrastructure.
>
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### Author:  [@bt90](https://forum.syncthing.net/u/bt90)
#### Post date: [July 19, 2025, 5:30am UTC](https://forum.syncthing.net/t/stun-syncthing-net-doesnt-resolve-anymore/24075/14 "2025-07-19T05:30:01Z")
Blockchain is out. Maybe we should ask an AI for STUN servers.