protonmail.ch

Observed Jul 18, 2026, 12:50 UTC (3d ago). Every field below was attested with an Ed25519 signature at scan time.

Up right now

Runs onProton

Email byProtonMail

Secured byLet's Encrypt

Also usesGoogle Search Console

1 subdomain · tranco_10k

Every line above is a signed observation. Check the math at the bottom of the page.

INFRASTRUCTURE MAPwhat protonmail.ch actually stands on - every host below is a signed observation

protonmail.ch

A / AAAA

185.70.42.21

Protonserves the site

ns1.protonmail.chns2.protonmail.chns3.protonmail.ch

protonmail.chanswers its DNS

mail.protonmail.chmailsec.protonmail.ch

ProtonMailreceives its email

TLS

protonmail.com

Let's Encryptissued its certificate

DNS Records

A 1

185.70.42.21

MX 2

5mail.protonmail.ch
10mailsec.protonmail.ch

TXT 8

abuseipdb-verification=SLIfh7Wm
mailru-verification: f224f0d86fde9b63
v=spf1 include:_spf.protonmail.ch ~all
google-site-verification=-5wo7THYiFWoq_XABAwEtMrcTdjtiNBHrmBlIWtocqM
google-site-verification=XFWl0NLw1rOXu2_PafVbnwk1cCd2Oz-cpfwM2crfrYM
v=DMARC1; p=quarantine; fo=1; aspf=s; adkim=s;
v=BIMI1; l=; a=;
v=STSv1; id=190906205100Z;

NS 3

ns1.protonmail.ch
ns2.protonmail.ch
ns3.protonmail.ch

SOA 1

ns1.protonmail.ch support.protonmail.ch

CAA 3

iodef "mailto:security@proton.me"
issue "letsencrypt.org"
issue "sectigo.com"

TLS Certificates (3)

Common Name	Issuer	Expires
`protonmail.com`	C=US, O=Let's Encrypt, CN=YR2	Tue, 29 Sep 2026 13:13:16 +0000
`YR2`	C=US, O=ISRG, CN=Root YR	Sat, 02 Sep 2028 23:59:59 +0000
`Root YR`	C=US, O=Internet Security Research Group, CN=ISRG Root X1	Thu, 02 Sep 2032 23:59:59 +0000

Subdomains (1)

app.protonmail.ch

The proof

Signed at scan time. Check the math yourself. Every line above is part of one signed observation. Re-hash it and check the Ed25519 signature in your own browser; nothing leaves your machine.

Verify this receipt

Put the receipt on your own site. A live badge showing what DomainDrift observes and signs for protonmail.ch. It updates itself. It attests a signed observation - not that the site is safe.

<a href="https://domaindrift.io/t/protonmail.ch">
  <img src="https://domaindrift.io/badge/protonmail.ch.svg"
       width="300" height="64" alt="DomainDrift signed observations for protonmail.ch">
</a>

Ed25519 Receipt

Receipt ID: 7583a7f2-f0cf-49b1-b5fe-5c6ed24c2798
Output Hash: 00f4d153bf5e0baf0392be4c79f54df2c1fa9f5370f7c70646fcc8111ec1b52c
Signature: ed25519:f09a2950e727b479b6863102f05be998b70820a400b4b023aa19315d0a599820b8d0b17d128f1b17f126de1161c4fc6dc9e479e316e08bbae7d449d8a0d3fd0a
Public Key: ed25519:178c3bd0f57d9d64b83cc4630753381e1a465005a2bbba3d032371f24af0bfd8
Parent: (genesis)
Plane: fast

Verify this in your browser

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