Summary: The DANE domain count is now 3,153,006 (c.f. 2,998,143 last month).

The number of domains that return DNSSEC-validated replies in response to MX queries is 17,670,769 (up from 17,263,168 last month). Thus DANE TLSA is deployed on ~17.84% of domains with DNSSEC. For more stats, see https://stats.dnssec-tools.org/. [ See the Credits[0] list below my signature. ]

As of today I count ~3.15 million domains with correct SMTP DANE TLSA records at every primary MX host that accepts connections[1]. As expected, the bulk of the DANE domains are hosted by the DNS/email hosting providers who've enabled DANE support for the customer domains they host. The top 20 MX host providers by domain count are below.

This month Last Month ---------- ---------- 1235173 one.com 1214915 one.com 275090 hostpoint.ch 273907 hostpoint.ch 158083 infomaniak.ch 156065 infomaniak.ch 156876 transip.nl 155803 transip.nl 150857 argewebhosting.nl 150793 argewebhosting.nl 106966 domeneshop.no 106219 domeneshop.no 97403 webhostingserver.nl 97607 webhostingserver.nl 95392 loopia.se 95145 loopia.se 92990 jouwweb.nl 72612 forpsi.com 73745 forpsi.com 50892 zxcs.nl 53390 zxcs.nl 46657 active24.com 46913 active24.com 41634 webreus.nl 41099 webreus.nl 38388 antagonist.nl 38881 antagonist.nl 36106 pcextreme.nl 35846 pcextreme.nl 27209 udmedia.de 27214 udmedia.de 27073 vevida.com 26766 web4u.cz 26765 webhosting.dk 26679 vevida.com 26430 web4u.cz 26497 webhosting.dk 23331 hosting2go.nl 23458 protonmail.ch 22745 protonmail.ch

The real numbers are surely larger, because I don't have access to the full zone data for most ccTLDs, especially .no/.cz/.de/.eu/.be. Speaking of countries, the IPv4 GeoIP distribution of DANE-enabled MX hosts shows the below top 20 countries (each unique IP address is counted, so multi-homed MX hosts are perhaps somewhat over-represented).

This month Last month ---------- ---------- 9425 TOTAL 9262 TOTAL 2763 DE, Germany 2704 DE, Germany 1810 NL, Netherlands 1785 NL, Netherlands 1723 US, United States 1723 US, United States 692 FR, France 674 FR, France 336 GB, United Kingdom 338 GB, United Kingdom 280 CZ, Czechia 275 CZ, Czechia 208 FI, Finland 202 FI, Finland 207 CA, Canada 199 CA, Canada 135 AT, Austria 132 DK, Denmark 134 DK, Denmark 132 AT, Austria 121 SG, Singapore 114 SG, Singapore 119 CH, Switzerland 113 CH, Switzerland 108 SE, Sweden 99 SE, Sweden 105 AU, Australia 99 AU, Australia 58 PL, Poland 54 PL, Poland 46 RU, Russia 46 RU, Russia 44 IE, Ireland 42 IE, Ireland 43 NO, Norway 41 NO, Norway 40 BR, Brazil 39 JP, Japan 39 JP, Japan 37 BR, Brazil

IPv6 is less common than IPv4 for MX hosts, and the top 20 countries by DANE MX host IPv6 GeoIP are:

This month Last month ---------- ---------- 7480 TOTAL 7177 TOTAL 3484 NL, Netherlands 3323 NL, Netherlands 1987 DE, Germany 1926 DE, Germany 771 US, United States 759 US, United States 298 FR, France 288 FR, France 165 CZ, Czechia 164 CZ, Czechia 144 GB, United Kingdom 144 GB, United Kingdom 82 FI, Finland 82 FI, Finland 61 CA, Canada 60 CA, Canada 50 CH, Switzerland 44 CH, Switzerland 46 AU, Australia 43 SE, Sweden 44 SE, Sweden 42 AU, Australia 41 SG, Singapore 40 SG, Singapore 32 RU, Russia 32 AT, Austria 32 AT, Austria 28 JP, Japan 28 JP, Japan 23 IE, Ireland 22 IE, Ireland 18 NO, Norway 19 NO, Norway 16 BR, Brazil 19 DK, Denmark 15 DK, Denmark 17 BR, Brazil 12 IN, India 11 SI, Slovenia 11 PL, Poland

There are 7,618 unique zones (7,482 last month) in which the underlying MX hosts are found. This counts each of the above providers as just one zone, so is a measure of the breadth of adoption in terms of organizations deploying DANE SMTP.

The number of published MX host TLSA RRsets found is 16,571 (16,403 last month). These cover 16,838 distinct MX hosts (16,670 last month, some MX hosts share the same TLSA records through CNAMEs).

The number of DANE domains that at some point were listed in Gmail's email transparency report is 580 (this is my ad-hoc criterion for a domain being a large-enough actively used email domain). Of these, 327 are in recent (last 90 days of) reports (see [2] below my signature).

Of the ~3.15 million DANE domains, 12,666 (12,621 last month) have "partial" TLSA records, that cover only a subset of the (secondary) MX hosts. While this protects traffic to some of the MX hosts, such domains are still vulnerable to the usual active attacks via the remaining MX hosts.

The number of domains with incorrect TLSA records or failure to offer STARTTLS (even though TLSA records are published) stands today at 1191 (1225 last month). Some of these have additional MX hosts that don't have broken TLSA records, so mail can still arrive via the remaining MX hosts. The affected domain counts for the top 10 problem MX hosts are:

88 beta.itcomputers.eu 20 mx1.exegy.com 19 mx1.mdbraber.com 17 mx1.digi.nl 16 e-vps.hacktheplanet.nl 15 web1.ams.dcg.t-host.net 15 smtp.meninodoporto.com.pt 15 artemis.strebsjig.net 12 mail.bi9.de 11 mx01.mykolab.com

To avoid email outages, please make sure to monitor the validity of your own TLSA records, and implement a reliable key rotation procedure. See:

https://dane.sys4.de/common_mistakes https://github.com/internetstandards/toolbox-wiki/blob/master/DANE-for-SMTP-... https://mail.sys4.de/pipermail/dane-users/2018-February/000440.html https://community.letsencrypt.org/t/please-avoid-3-0-1-and-3-0-2-dane-tlsa-r... https://mail.sys4.de/pipermail/dane-users/2017-August/000417.html https://github.com/baknu/DANE-for-SMTP/wiki/2.-Implementation-resources

https://datatracker.ietf.org/doc/html/rfc7671#section-8.1 https://datatracker.ietf.org/doc/html/rfc7671#section-8.4

After eliminating parked domains that do not accept email, the number of "real" email domains with bad DNSSEC support stands at 1181 (1148 last month). The top 10 name server operators with problem domains are:

This Month Last month ---------- ---------- 596 registrar-servers.com 579 registrar-servers.com 171 axc.nl 164 axc.nl 83 ebola.cz 87 ebola.cz 42 worldnic.com 39 worldnic.com 31 mijndomein.nl 32 mijndomein.nl 30 ns01.nl 29 ns01.nl 28 made-easy.ch 29 made-easy.ch 18 cloudflare.com 17 cloudflare.com 15 register.com 14 register.com 15 epik.com 11 epik.com

If anyone has good contacts at some of these providers, please encourage them to remediate not only the broken domains (I can send them a list), but also the root cause that makes the breakage possible.

Four of the domains all whose nameservers have broken denial of existence appear in the last 120 days of Google transparency reports:

coren-sp.gov.br icv-crew.com urbtix.hk novathreads.us

-- Viktor.

[0] Credits: The coverage of DNSSEC domains continues to improve with ongoing data support from Paul Vixie of Farsight Security. Credits also due to ICANN for gTLD data via CZDS, and to the TLD registries for .CH, .COM, .DK, .FR, .INFO, .IS, .LI, .NL, .NU, .ORG and .SE. More data sources of ccTLD signed delegations welcome.

[1] Some domains deliberately include MX hosts that are always down, presumably as a hurdle to botnet SMTP code that gives up where real MTAs might persist. I am not a fan of this type of defence (it can also impose undue latency on legitimate email). However, provided the dead hosts still have TLSA records, (which don't need to match anything, just need to exist and be well-formed) there's no loss of security.

[2] DANE domains appearing in last 90 days of Google Email transparency reports:

univie.ac.at elster.de mailplus.nl gmx.at emailn.de mailshover.nl vbv.at fau.de markteffectmail.nl tip.net.au freenet.de mijnhypotheekonline.nl pcug.org.au gmx.de mijnsalon.nl boozyshop.be jpberlin.de mijnuvt.nl triodos.be lmu.de minbuza.nl e-negociacao.com.br lrz.de mindef.nl e-renegocie.com.br mail.de minvenj.nl nic.br mpg.de mm1.nl registro.br neutraler-versand.de mulderretail.nl activfitness-news.ch posteo.de nieuwsservice-rvo.nl gmx.ch ruhr-uni-bochum.de ns.nl hostpoint.ch tum.de orangebag.nl infomaniak.ch tutanota.de ouderportaal.nl linsenkontakt.ch uni-augsburg.de overheid.nl open.ch uni-erlangen.de parlement.nl protonmail.ch uni-muenchen.de partijvoordedieren.nl switch.ch unitymedia.de plusticket.nl simplelogin.co web.de politie.nl ansigtsyogaonline.com westlotto.de pp-prd.nl anubisnetworks.com actie.deals previder.nl boekenwereld.com exoticmix.dk rdw.nl cm.com fibianet.dk rijksoverheid.nl connectsb.com handelsbanken.dk rivm.nl dailyplaylists.com jule-sweaters.dk rotterdam.nl datev.com juliesandlau.dk sans-mail.nl fabfilter.com netic.dk schoudercom.nl fastware-hosting.com nota.dk schuurman-schoenen.nl flaneurhomme.com nst.dk smartwatchbanden.nl gmx.com seniornews.dk sportrusten.nl habr.com shapeit.dk stater.nl hoobly.com shellcard.dk telefoonglaasje.nl hotelsinduitsland.com stil.dk transip.nl imcnig.com uvm.dk triodos.nl infomaniak.com wavell.dk tweedekamer.nl ingthink.com tilburguniversity.edu utwente.nl joomlapolis.com spike.email uvt.nl jula.com spotler.email uwv.nl kpn.com talentech.email voorpositiviteit.nl leszexpertsfle.com rediris.es vpo.nl librti.com triodos.es vu.nl mail.com uv.es wasstraatdewalvis.nl mammoetmail.com egu.eu waternet.nl mantapsurvey.com glowliving.eu woongarantvolmacht.nl matilhadobemadestramento.com zone.eu zorgmail.nl mplbeauty.com zonevs.eu annabellstefanussen.no mx-relay.com handelsbanken.fi audi.no nanolearning.com tarjousrinki.fi derute.no nine-pine.com traficom.fi domeneshop.no one.com ac-strasbourg.fr forbrukslaan.no protonmail.com compagnie-des-sens.fr guttelus.no protonvpn.com kangouroukids.fr handelsbanken.no renworkshops.com oo2.fr idrettenonline.no sankakucomplex.com srci.fr kapitalkontroll.no serverclienti.com fidesz.hu mystuff.no societe.com mszp.hu norskgrammatikk.no solvinity.com neolink.link plukkselv.no stater.com pm.me rushtrampoline.no stellarequipment.com army.mil uib.no thalesgroup.com dla.mil viphuset.no thepcw.com jten.mil atelkamera.nu thepcwholesale.com mail.mil goget.nu triodos.com militaryonesource.mil aegee.org tutanota.com navy.mil calyxinstitute.org up2staff.com osd.mil debian.org veganallsorts.com socom.mil freebsd.org vitstore.com uscg.mil gentoo.org vivaldi.com usmc.mil ietf.org webmailph.com comcast.net isc.org xfinity.com fivem.net mailbox.org xfinityhomesecurity.com gmx.net mailop.org xfinitymobile.com habramail.net netbsd.org ymeuniverse.com hr-manager.net openssl.org akce-incomputer.cz inexio.net oraclegirl.org cesnet.cz mijngezondheid.net ozlabs.org csob.cz mpssec.net samba.org cuni.cz procurios.net torproject.org cvut.cz ripe.net whatpulse.org ekokoza.cz riseup.net psgaz.pl fio.cz t-2.net asf.com.pt gigalekarna.cz transip.net mobily.com.sa itesco.cz xs4all.net axmarin.se kb.cz 123watches.nl bilprovningen.se klenotyaurum.cz amsterdam.nl boplatssyd-automail.se klubpevnehozdravi.cz argeweb.nl ecster.se manymail.cz belastingdienst.nl handelsbanken.se mkluzkoviny.cz bhsupport.nl lomervarde.se muni.cz bluerail.nl loopia.se nanospace.cz boekwinkeltjes.nl loopiahosting.se nic.cz bolerolimonadewinkel.nl minmyndighetspost.se onebit.cz boozyshop.nl polisen.se optimail.cz burgernet.nl racketspecialisten.se poptavej.cz cbr.nl skatteverket.se predplatit.cz derooijfotografie.nl teknikdelar.se scrptd.cz digid.nl theletter.se server4u.cz duo.nl voteit.se smtp.cz eco-logisch.nl websupport.se sparkys.cz edenhotels.nl dovypredania.sk stoklasa.cz ezorg.nl kadernickyservis.sk vas-server.cz fidus.nl mastersport.sk virusfree.cz haibu.nl mklozkoviny.sk zdravestravovani.cz healthcheckcenter.nl rondogo.sk bayern.de heilbron.nl toptop.sk brandenburg.de herinneringenoplinnen.nl zapardrobnych.sk bund.de interim-netwerk.nl triodos.co.uk bundesregierung.de justis.nl govtrack.us datev.de lico.nl quantum-services.us dfn.de luxiez.nl ru.ac.za