fourmilab.ch

Observed Aug 11, 2026, 04:32 UTC (3d ago). Every field below was attested with an Ed25519 signature at scan time.

This reading of fourmilab.ch was taken 3d ago

fourmilab.ch is on the survey sweep, which works its way across the whole catalog rather than returning to one name on a schedule. Putting fourmilab.ch under watch moves it to the fast lane, where DomainDrift re-checks it about every 5 minutes and signs each reading, so a change becomes a dated event within minutes instead of waiting for the sweep to come round.

Watch fourmilab.ch Watching a domain needs a DRM3 account. The reading above stays free and public either way.
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Up right now
Runs onAmazon
Email byGoogle Workspace
Secured byLet's Encrypt
IPv6 · 1 subdomain · tranco_20k
Every line above is a signed observation. Check the math at the bottom of the page.
INFRASTRUCTURE MAPwhat fourmilab.ch actually stands on - every host below is a signed observation
fourmilab.ch
A / AAAA
52.28.236.02a05:d014:d43:3101:94aa:a276:e035:6a2a
Amazonserves the site
NS
ns-1463.awsdns-54.orgns-1903.awsdns-45.co.ukns-209.awsdns-26.comns-614.awsdns-12.net
awsdns-54.org + awsdns-45.co.uk + moreanswers its DNS
MX
aspmx.l.google.comalt3.aspmx.l.google.comalt4.aspmx.l.google.comalt1.aspmx.l.google.com+1 more
Google Workspacereceives its email
TLS
fourmilab.ch
Let's Encryptissued its certificate

DNS Records

A 1

  • 52.28.236.0

AAAA 1

  • 2a05:d014:d43:3101:94aa:a276:e035:6a2a

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 1

  • v=spf1 include:_spf.google.com ip4:193.8.230.0/24 ip4:52.28.236.0 ip4:3.123.190.28 ~all

NS 4

  • ns-1463.awsdns-54.org
  • ns-1903.awsdns-45.co.uk
  • ns-209.awsdns-26.com
  • ns-614.awsdns-12.net

SOA 1

  • ns-1903.awsdns-45.co.uk awsdns-hostmaster.amazon.com

CAA 1

  • issue "letsencrypt.org"

DMARC_RECORDS 1

  • v=DMARC1; p=none

TLS Certificates (3)

Common NameIssuerExpires
fourmilab.ch C=US, O=Let's Encrypt, CN=YR1 Thu, 29 Oct 2026 16:00:50 +0000
YR1 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)

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; the only network request the check makes is for the published public keys.

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Ed25519 Receipt

Receipt ID
rcpt_006e445d65fc1814
Output Hash
18679f70d7a7971f2b999ce45d39669d097b24f9c4ad495d666060b0455c3046
Signature
ed25519:b9aa2a086bd407afea4b1f6e270ac894ac6a295bff569f270382aac3887e0eb032eaf53aeadd029c901794e03863171ad3d213412def29a6411b6905a6d62008
Public Key
ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9
Parent
(genesis)
Plane
fast
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CONTINUOUS INTERNET TELEMETRY24H DRIFT42,666 material changesacross 40,741 domains · 24h to ~2h ago · -1,416 vs yesterdayROTATION55 domains moved DNS from koaladns.com to kirklanddc.com, 54 moved backa rotation loop, not a migration · 24hNOW491 curated domains not reachablelast probe, steadySITE ERRORS36,509 sites serving errorslast probe · 5xx / 404 / TLSBOT DEFENSEbot defense observed on 115,801 sites429 rate-limit / 403 bot-block, a posture signal