libretexts.org

Observed Jul 18, 2026, 13:03 UTC (8h 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

Registered withSquarespace Domains II LLC

Also uses1PasswordGoogle Search ConsoleAtlassian

IPv6 · 1 subdomain · tranco_20k

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

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

libretexts.org

A / AAAA

104.20.33.226172.66.163.1192606:4700:10::6814:21e22606:4700:10::ac42:a377

Cloudflareserves the site

ridge.ns.cloudflare.comceline.ns.cloudflare.com

cloudflare.comanswers its DNS

aspmx.l.google.comalt1.aspmx.l.google.comalt2.aspmx.l.google.comalt3.aspmx.l.google.com+1 more

Google Workspacereceives its email

TLS

libretexts.org

Google Trust Servicesissued its certificate

DNS Records

A 2

104.20.33.226
172.66.163.119

AAAA 2

2606:4700:10::6814:21e2
2606:4700:10::ac42:a377

MX 5

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

TXT 7

MS=24EEDA32A1B64093067F80942348F46B7C53AB15
1password-site-verification=YDXLXEOPD5A4RIQ4DGBXTTLXAU
google-site-verification=ej-DagC8sD_MaouJikcyiz-sulM4oKdtg95K_XZJLjc
google-site-verification=zIAad45IZShT-a7Q2GnGn7XjbofS1NobaXCuldPdF58
v=spf1 include:_spf.google.com include:mailgun.org include:spf.mailjet.com ~all
atlassian-domain-verification=K5DMrg/KPVIJcji/XYQ5GaWR5qtDtay27IEufDV87yqJmqX4uKhjhgZxNMajMm2w
v=DMARC1; p=quarantine; ruf=mailto:dev@libretexts.org; fo=1; rua=mailto:aed54a8da9d94419b5651cf163384e92@dmarc-reports.cloudflare.net;

NS 2

ridge.ns.cloudflare.com
celine.ns.cloudflare.com

SOA 1

celine.ns.cloudflare.com dns.cloudflare.com

CAA 17

iodef "mailto:delmar@libretexts.org"
issue "amazon.com"
issue "comodoca.com"
issue "digicert.com; cansignhttpexchanges=yes"
issue "letsencrypt.org"
issue "pki.goog; cansignhttpexchanges=yes"
issue "sectigo.com"
issue "ssl.com"
issuewild "amazon.com"
issuewild "amazonaws.com"

TLS Certificates (3)

Common Name	Issuer	Expires
`libretexts.org`	C=US, O=Google Trust Services, CN=WE1	Thu, 24 Sep 2026 08:12:21 +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 (1)

davis.libretexts.org

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

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

Ed25519 Receipt

Receipt ID: 40e72408-d586-424b-8320-09afbe4f76fc
Output Hash: 36c794b06485324acb9b9e39e9221fb4255b87be0f1f010720d6e6ccd2bfd2b3
Signature: ed25519:4c20d041ede066f27dcd2eb070abe218b25cbd5a53e35e72ce4582ecbc3736803b4d32ca5ad1bdcd56aeb0626bb975f10e98c72c4c89dd6e9d4c2bf8f118120f
Public Key: ed25519:178c3bd0f57d9d64b83cc4630753381e1a465005a2bbba3d032371f24af0bfd8
Parent: (genesis)
Plane: fast

Verify this in your browser

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