cert.org

Observed 2026-07-13T05:00:30.203Z (4h ago). Every field below was attested with an Ed25519 signature at scan time.

Up right now

Runs onCloudflare

Also usesGoogle Search Console

2 subdomains · tranco_20k

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

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

cert.org

A / AAAA

147.72.252.242

Cloudflareserves the site

ns-1403.awsdns-47.orgns-916.awsdns-50.netns-28.awsdns-03.comns-1794.awsdns-32.co.uk

awsdns-47.org + awsdns-50.net + moreanswers its DNS

tingley.sei.cmu.edutilton.sei.cmu.edu

cmu.edureceives its email

HTTPS probe

redirect Redirecting (3xx) 301 → https://www.sei.cmu.edu/certsite/

HTTP status301

Servercloudflare

TLS protocolHTTP/2

TLS issuernot observed

Behind Cloudflareyes

Response time205 ms

DNS resolutionNOERROR

Redirect chain

https://www.sei.cmu.edu/certsite/

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

DNS Records

A 1

147.72.252.242

MX 2

10tingley.sei.cmu.edu
10tilton.sei.cmu.edu

TXT 5

MS=ms99326395
v=spf1 ip4:147.72.252.0/27 include:spf.protection.office365.us ?all
google-site-verification=XOhFzgbzrxnwXF_zY4WWTJSkIyRfIjEI8eaOJCx4WiI
GjlKiHz4O+yqufLrRIiCkmyaNeKDsFtlP0EdfJ5Hd0ERRCB3rBFfT0hjRz5KpuVbK7z1iW6Vh6MtnSK/dHi1Lg==
v=DMARC1; p=none; adkim=r; aspf=r; fo=0; rf=afrf; rua=mailto:brndm82m-aen4zffh@sei.cmu.edu; ruf=mailto:zahuj14e-0jwboxgg@sei.cmu.edu

NS 4

ns-1403.awsdns-47.org
ns-916.awsdns-50.net
ns-28.awsdns-03.com
ns-1794.awsdns-32.co.uk

SOA 1

ns-1403.awsdns-47.org awsdns-hostmaster.amazon.com

CAA 3

issuewild sectigo.com
issue sectigo.com
iodef mailto:caa-reports@sei.cmu.edu

TLS Certificates (0)

None.

Subdomains (2)

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

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

Ed25519 Receipt

Receipt ID: d4416160-e460-4fb1-8734-4a787a9e5e95
Output Hash: c460a1f8c08e7e5910c662a9f5dd3ef4b10ec2c3c0af8136a1cc1ec8712b106e
Signature: ed25519:8226eded6b5f46d8249f1f1457cc305ea80294af8ebe2935def787a3f825af073b6e611869fa2afc5043c127a5fc4c99b329f5949c42df46799998d5c534e003
Public Key: ed25519:d610d74ef18f683e5beb859d241d5e67dff0c122e8928b06bec1c2476f4ba27b
Parent: (genesis)
Plane: fast

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