In this article we are going to consider Google STUN server and complete list of free and public stun and TURN servers

Google provides the following Free STUN servers for public use

Google STUN server

All these servers are working when I tested them

• stun.l.google.com has address 74.125.192.127
• stun1.l.google.com has address 172.217.192.127
• stun2.l.google.com has address 142.250.15.127
• stun3.l.google.com has address 108.177.15.127
• stun4.l.google.com has address 108.177.119.127

Here is an ICE Server Array using these STUN servers.

const iceServers = [
    { urls: "stun:stun.l.google.com:19302" },
    { urls: "stun:stun.l.google.com:5349" },
    { urls: "stun:stun1.l.google.com:3478" },
    { urls: "stun:stun1.l.google.com:5349" },
    { urls: "stun:stun2.l.google.com:19302" },
    { urls: "stun:stun2.l.google.com:5349" },
    { urls: "stun:stun3.l.google.com:3478" },
    { urls: "stun:stun3.l.google.com:5349" },
    { urls: "stun:stun4.l.google.com:19302" },
    { urls: "stun:stun4.l.google.com:5349" }
];

The best STUN server to use is the Metered TURN server

You need to create a free account to be able to access it.

Metered Global STUN TURN servers​

• Global Geo-Location targeting: Automatically directs traffic to the nearest servers, for lowest possible latency and highest quality performance.
• Servers in 12 Regions of the world: Toronto, Miami, San Francisco, Amsterdam, London, Frankfurt, Bangalore, Singapore,Sydney
• Low Latency: less than 50 ms latency, anywhere across the world.
• Cost-Effective: pay-as-you-go pricing with bandwidth and volume discounts available.
• Easy Administration: Get usage logs, emails when accounts reach threshold limits, billing records and email and phone support.
• Standards Compliant: Conforms to RFCs 5389, 5769, 5780, 5766, 6062, 6156, 5245, 5768, 6336, 6544, 5928 over UDP, TCP, TLS, and DTLS.
• Multi‑Tenancy: Create multiple credentials and separate the usage by customer, or different apps. Get Usage logs, billing records and threshold alerts.
• Reliability: 99.999% Uptime with SLA.
• Enterprise Scale: With no limit on concurrent traffic or total traffic. Metered TURN Servers provide Enterprise Scalability
• 5 GB/mo Free: Get 5 GB every month free TURN server usage with the Free Plan

You can create an account on Metered website and get 50GB of Free TURN usage every month

You can test the STUN and TURN servers here:
https://www.metered.ca/turn-server-testing

Other Public STUN Server List

Here is a list of other STUN servers that may or may not be working

stun.1und1.de:3478
stun.gmx.net:3478
stun.l.google.com:19302
stun1.l.google.com:19302
stun2.l.google.com:19302
stun3.l.google.com:19302
stun4.l.google.com:19302
23.21.150.121:3478
iphone-stun.strato-iphone.de:3478
numb.viagenie.ca:3478
stun.12connect.com:3478
stun.12voip.com:3478
stun.1und1.de:3478
stun.2talk.co.nz:3478
stun.2talk.com:3478
stun.3clogic.com:3478
stun.3cx.com:3478
stun.a-mm.tv:3478
stun.aa.net.uk:3478
stun.acrobits.cz:3478
stun.actionvoip.com:3478
stun.advfn.com:3478
stun.aeta-audio.com:3478
stun.aeta.com:3478
stun.altar.com.pl:3478
stun.annatel.net:3478
stun.antisip.com:3478
stun.arbuz.ru:3478
stun.avigora.fr:3478
stun.awa-shima.com:3478
stun.b2b2c.ca:3478
stun.bahnhof.net:3478
stun.barracuda.com:3478
stun.bluesip.net:3478
stun.bmwgs.cz:3478
stun.botonakis.com:3478
stun.budgetsip.com:3478
stun.cablenet-as.net:3478
stun.callromania.ro:3478
stun.callwithus.com:3478
stun.chathelp.ru:3478
stun.cheapvoip.com:3478
stun.ciktel.com:3478
stun.cloopen.com:3478
stun.comfi.com:3478
stun.commpeak.com:3478
stun.comtube.com:3478
stun.comtube.ru:3478
stun.cope.es:3478
stun.counterpath.com:3478
stun.counterpath.net:3478
stun.datamanagement.it:3478
stun.dcalling.de:3478
stun.demos.ru:3478
stun.develz.org:3478
stun.dingaling.ca:3478
stun.doublerobotics.com:3478
stun.dus.net:3478
stun.easycall.pl:3478
stun.easyvoip.com:3478
stun.ekiga.net:3478
stun.epygi.com:3478
stun.etoilediese.fr:3478
stun.faktortel.com.au:3478
stun.freecall.com:3478
stun.freeswitch.org:3478
stun.freevoipdeal.com:3478
stun.gmx.de:3478
stun.gmx.net:3478
stun.gradwell.com:3478
stun.halonet.pl:3478
stun.hellonanu.com:3478
stun.hoiio.com:3478
stun.hosteurope.de:3478
stun.ideasip.com:3478
stun.infra.net:3478
stun.internetcalls.com:3478
stun.intervoip.com:3478
stun.ipcomms.net:3478
stun.ipfire.org:3478
stun.ippi.fr:3478
stun.ipshka.com:3478
stun.irian.at:3478
stun.it1.hr:3478
stun.ivao.aero:3478
stun.jumblo.com:3478
stun.justvoip.com:3478
stun.kanet.ru:3478
stun.kiwilink.co.nz:3478
stun.l.google.com:19302
stun.linea7.net:3478
stun.linphone.org:3478
stun.liveo.fr:3478
stun.lowratevoip.com:3478
stun.lugosoft.com:3478
stun.lundimatin.fr:3478
stun.magnet.ie:3478
stun.mgn.ru:3478
stun.mit.de:3478
stun.mitake.com.tw:3478
stun.miwifi.com:3478
stun.modulus.gr:3478
stun.myvoiptraffic.com:3478
stun.mywatson.it:3478
stun.nas.net:3478
stun.neotel.co.za:3478
stun.netappel.com:3478
stun.netgsm.com.tr:3478
stun.nfon.net:3478
stun.noblogs.org:3478
stun.noc.ams-ix.net:3478
stun.nonoh.net:3478
stun.nottingham.ac.uk:3478
stun.nova.is:3478
stun.on.net.mk:3478
stun.ooma.com:3478
stun.ooonet.ru:3478
stun.oriontelekom.rs:3478
stun.outland-net.de:3478
stun.ozekiphone.com:3478
stun.personal-voip.de:3478
stun.phone.com:3478
stun.pjsip.org:3478
stun.poivy.com:3478
stun.powerpbx.org:3478
stun.powervoip.com:3478
stun.ppdi.com:3478
stun.qq.com:3478
stun.rackco.com:3478
stun.rapidnet.de:3478
stun.rb-net.com:3478
stun.rixtelecom.se:3478
stun.rockenstein.de:3478
stun.rolmail.net:3478
stun.rynga.com:3478
stun.schlund.de:3478
stun.services.mozilla.com:3478
stun.sigmavoip.com:3478
stun.sip.us:3478
stun.sipdiscount.com:3478
stun.sipgate.net:10000
stun.sipgate.net:3478
stun.siplogin.de:3478
stun.sipnet.net:3478
stun.sipnet.ru:3478
stun.siportal.it:3478
stun.sippeer.dk:3478
stun.siptraffic.com:3478
stun.skylink.ru:3478
stun.sma.de:3478
stun.smartvoip.com:3478
stun.smsdiscount.com:3478
stun.snafu.de:3478
stun.softjoys.com:3478
stun.solcon.nl:3478
stun.solnet.ch:3478
stun.sonetel.com:3478
stun.sonetel.net:3478
stun.sovtest.ru:3478
stun.speedy.com.ar:3478
stun.spokn.com:3478
stun.srce.hr:3478
stun.ssl7.net:3478
stun.stunprotocol.org:3478
stun.symform.com:3478
stun.symplicity.com:3478
stun.t-online.de:3478
stun.tagan.ru:3478
stun.teachercreated.com:3478
stun.tel.lu:3478
stun.telbo.com:3478
stun.telefacil.com:3478
stun.tng.de:3478
stun.twt.it:3478
stun.u-blox.com:3478
stun.ucsb.edu:3478
stun.ucw.cz:3478
stun.uls.co.za:3478
stun.unseen.is:3478
stun.usfamily.net:3478
stun.veoh.com:3478
stun.vidyo.com:3478
stun.vipgroup.net:3478
stun.viva.gr:3478
stun.vivox.com:3478
stun.vline.com:3478
stun.vo.lu:3478
stun.vodafone.ro:3478
stun.voicetrading.com:3478
stun.voip.aebc.com:3478
stun.voip.blackberry.com:3478
stun.voip.eutelia.it:3478
stun.voiparound.com:3478
stun.voipblast.com:3478
stun.voipbuster.com:3478
stun.voipbusterpro.com:3478
stun.voipcheap.co.uk:3478
stun.voipcheap.com:3478
stun.voipfibre.com:3478
stun.voipgain.com:3478
stun.voipgate.com:3478
stun.voipinfocenter.com:3478
stun.voipplanet.nl:3478
stun.voippro.com:3478
stun.voipraider.com:3478
stun.voipstunt.com:3478
stun.voipwise.com:3478
stun.voipzoom.com:3478
stun.vopium.com:3478
stun.voxox.com:3478
stun.voys.nl:3478
stun.voztele.com:3478
stun.vyke.com:3478
stun.webcalldirect.com:3478
stun.whoi.edu:3478
stun.wifirst.net:3478
stun.wwdl.net:3478
stun.xs4all.nl:3478
stun.xtratelecom.es:3478
stun.yesss.at:3478
stun.zadarma.com:3478
stun.zadv.com:3478
stun.zoiper.com:3478
stun1.faktortel.com.au:3478
stun1.l.google.com:19302
stun1.voiceeclipse.net:3478
stun2.l.google.com:19302
stun3.l.google.com:19302
stun4.l.google.com:19302
stunserver.org:3478