exercism.org

Observed 2026-07-15T09:02:40.947Z (2d ago). Every field below was attested with an Ed25519 signature at scan time.

Up right now

Runs onCloudflare

Email byGoogle Workspace

Also usesGoogle Search Console

IPv6 · 3 subdomains · 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

172.67.74.121104.26.7.40104.26.6.402606:4700:20::681a:728+2 more

Cloudflareserves the site

suzanne.ns.cloudflare.comgabriel.ns.cloudflare.com

cloudflare.comanswers its DNS

alt4.aspmx.l.google.comalt3.aspmx.l.google.comalt1.aspmx.l.google.comaspmx.l.google.com+1 more

Google Workspacereceives its email

HTTPS probe

ok Responding normally (2xx) 200 OK

HTTP status200

Servercloudflare

TLS protocolHTTP/2

TLS issuernot observed

Behind Cloudflareyes

Response time13 ms

DNS resolutionNOERROR

Every field above is part of the same signed observation as the records below. Blank means not observed, never "none".

DNS Records

A 3

172.67.74.121
104.26.7.40
104.26.6.40

AAAA 3

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

MX 5

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

TXT 6

google-site-verification=TRv98iiuT7WJlVYOU3wAULbBaDUgr3nCjoNDQdWjRFY
v=spf1 include:_spf.google.com include:one.zoho.jp include:amazonses.com ~all
brave-ledger-verification=8fb9494db5d0412cfde0be6819ca03b245837f1c2a96add9238776857bdf6a02
google-site-verification=x00E1pZHv-2S6FRc7KaDUZ5xCar3uQvHf8s7gfrJwBQ
v=DMARC1;p=quarantine;rua=mailto:dmarcreports@exercism.org
v=DKIM1; (detected)

NS 2

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

SOA 1

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

TLS Certificates (0)

None.

Subdomains (3)

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: a335c703-504b-4426-b2d7-e85b4ce2932b
Output Hash: df31b8304dc43c28ceca4892e976eb54d2e3e81d11291efbf777f364ac26bc52
Signature: ed25519:60fa67983a99cc582daabeda91e5e31c85c2bcb43d2547726bfb325b03a4fae12535fa92cbf7b2a9dc7dc00271220203b937de9aa02b12b5a2486fd9347c7c0a
Public Key: ed25519:d610d74ef18f683e5beb859d241d5e67dff0c122e8928b06bec1c2476f4ba27b
Parent: (genesis)
Plane: fast

Verify this in your browser

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