projecteuler.net

Observed Jul 17, 2026, 15:12 UTC (1d ago). Every field below was attested with an Ed25519 signature at scan time.

Up right now

Secured byLet's Encrypt

IPv6 · tranco_100k

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

INFRASTRUCTURE MAPwhat projecteuler.net actually stands on - every host below is a signed observation

projecteuler.net

A / AAAA

185.151.30.1282a07:7800::128

2a07serves the site

ns2.stackdns.comns4.stackdns.comns1.stackdns.comns3.stackdns.com

stackdns.comanswers its DNS

mx.stackmail.com

stackmail.comreceives its email

TLS

*.projecteuler.net

Let's Encryptissued its certificate

DNS Records

A 1

185.151.30.128

AAAA 1

2a07:7800::128

MX 1

10mx.stackmail.com

TXT 3

v=spf1 include:spf.stackmail.com a mx -all
v=DMARC1;p=reject;sp=reject;adkim=r;aspf=r;pct=100;fo=0;rf=afrf;ri=86400
v=STSv1; id=2025121401;

NS 4

ns2.stackdns.com
ns4.stackdns.com
ns1.stackdns.com
ns3.stackdns.com

SOA 1

ns1.stackdns.com hostmaster.stackdns.com

TLS Certificates (3)

Common Name	Issuer	Expires
`*.projecteuler.net`	C=US, O=Let's Encrypt, CN=YR2	Sun, 11 Oct 2026 12:15:02 +0000
`YR2`	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 (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 projecteuler.net. It updates itself. It attests a signed observation - not that the site is safe.

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

Ed25519 Receipt

Receipt ID: be5901a3-e91b-46bb-af0e-c4d27e3deb73
Output Hash: 9017cab9a2036900f05cfd01e630c5f5620f8ba5e79fb1e8e6734c6bd64904a1
Signature: ed25519:9536dcee81f0dd50d6669a2d77533be08c9c8fc0faa2d9d47f153c9a2461d55034254cd7cb43a837c98245fb73d576287f22f8622e7e8bfc38be88901bbb2f03
Public Key: ed25519:178c3bd0f57d9d64b83cc4630753381e1a465005a2bbba3d032371f24af0bfd8
Parent: (genesis)
Plane: fast

Verify this in your browser

Permalink: https://domaindrift.io/t/projecteuler.net