exercism.org

Observed Jul 18, 2026, 12:01 UTC (2d ago). Every field below was attested with an Ed25519 signature at scan time.

Up right now

Runs onCloudflare

Email byGoogle Workspace

Secured byGoogle Trust Services

Also usesGoogle Search Console

IPv6 · education

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

INFRASTRUCTURE MAPwhat exercism.org actually stands on - every host below is a signed observation

exercism.org

A / AAAA

172.67.74.121104.26.6.40104.26.7.402606:4700:20::681a:628+2 more

Cloudflareserves the site

gabriel.ns.cloudflare.comsuzanne.ns.cloudflare.com

cloudflare.comanswers its DNS

aspmx.l.google.comalt3.aspmx.l.google.comalt4.aspmx.l.google.comalt1.aspmx.l.google.com+1 more

Google Workspacereceives its email

TLS

exercism.org

Google Trust Servicesissued its certificate

DNS Records

A 3

172.67.74.121
104.26.6.40
104.26.7.40

AAAA 3

2606:4700:20::681a:628
2606:4700:20::ac43:4a79
2606:4700:20::681a:728

MX 5

1aspmx.l.google.com
10alt3.aspmx.l.google.com
10alt4.aspmx.l.google.com
5alt1.aspmx.l.google.com
5alt2.aspmx.l.google.com

TXT 5

brave-ledger-verification=8fb9494db5d0412cfde0be6819ca03b245837f1c2a96add9238776857bdf6a02
google-site-verification=TRv98iiuT7WJlVYOU3wAULbBaDUgr3nCjoNDQdWjRFY
google-site-verification=x00E1pZHv-2S6FRc7KaDUZ5xCar3uQvHf8s7gfrJwBQ
v=spf1 include:_spf.google.com include:one.zoho.jp include:amazonses.com ~all
v=DMARC1;p=quarantine;rua=mailto:dmarcreports@exercism.org

NS 2

gabriel.ns.cloudflare.com
suzanne.ns.cloudflare.com

SOA 1

gabriel.ns.cloudflare.com dns.cloudflare.com

TLS Certificates (3)

Common Name	Issuer	Expires
`exercism.org`	C=US, O=Google Trust Services, CN=WE1	Sun, 20 Sep 2026 12:04:32 +0000
`WE1`	C=US, O=Google Trust Services LLC, CN=GTS Root R4	Tue, 20 Feb 2029 14:00:00 +0000
`GTS Root R4`	C=BE, O=GlobalSign nv-sa, 2.5.4.11=Root CA, CN=GlobalSign Root CA	Fri, 28 Jan 2028 00:00:42 +0000

Subdomains (0)

None observed.

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 exercism.org. It updates itself. It attests a signed observation - not that the site is safe.

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

Ed25519 Receipt

Receipt ID: 6b4790c8-41e4-4a41-9faf-14b70d773df9
Output Hash: 2e9d0dcf465fdcbb8e50a28ac6db9050e64e0ea448bf24736ca62ed60d23e68a
Signature: ed25519:196da84f9814be738b0ced204bff549a51eed74c45ce1cb8873d2cb65814ced1eef72000bd79b85984634da612f89f97ada35fe26d40a08d0e60e5db61caec09
Public Key: ed25519:178c3bd0f57d9d64b83cc4630753381e1a465005a2bbba3d032371f24af0bfd8
Parent: (genesis)
Plane: fast

Verify this in your browser

Permalink: https://domaindrift.io/t/exercism.org