core.ac.uk

Observed 2026-07-12T22:24:41.307Z (12h ago). Every field below was attested with an Ed25519 signature at scan time.

Up right now

Runs onCloudflare

Email byMicrosoft 365

Also usesAtlassianGoogle Search Console

IPv6 · 10 subdomains · tranco_10k

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

INFRASTRUCTURE MAPwhat core.ac.uk actually stands on - every host below is a signed observation

core.ac.uk

A / AAAA

104.21.20.56172.67.191.2052606:4700:3033::ac43:bfcd2606:4700:3035::6815:1438

Cloudflareserves the site

romina.ns.cloudflare.comjohn.ns.cloudflare.com

cloudflare.comanswers its DNS

core-ac-uk.mail.protection.outlook.com

Microsoft 365receives its email

HTTPS probe

ok Responding normally (2xx) 200 OK

HTTP status200

Servercloudflare

TLS protocolHTTP/2

TLS issuernot observed

Behind Cloudflareyes

Response time161 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 2

104.21.20.56
172.67.191.205

AAAA 2

2606:4700:3033::ac43:bfcd
2606:4700:3035::6815:1438

MX 1

0core-ac-uk.mail.protection.outlook.com

TXT 6

CC013172-C797-4C59-8252-135EE277A6C7
atlassian-domain-verification=ME7l7TGCJ9xfQDWdKMs9sm68zGdtOmB6VYBw/R969AtLbajdxCR8ut8NTe3GEMFR
google-site-verification=N1l1LngrCrqAZIsIhHlh1UtPsMmM-Bt3PtfK4yM_l58
ms-domain-verification=3529416e-6049-41a0-8889-84c4c8e49c25
v=spf1 include:spf.protection.outlook.com include:spf.core.ac.uk include:_spf.mlsend.com ip4:137.108.232.47 ip4:137.108.232.48 ip4:137.108.170.8 ip4:137.108.170.38 ip4:137.108.170.40 -all
v=DMARC1;p=quarantine;sp=quarantine;pct=100;rua=mailto:dmarc@open.ac.uk,mailto:e1pWdXALyij@dmarc-rua.mailcheck.service.ncsc.gov.uk

NS 2

romina.ns.cloudflare.com
john.ns.cloudflare.com

SOA 1

john.ns.cloudflare.com dns.cloudflare.com

TLS Certificates (0)

None.

Subdomains (10)

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 core.ac.uk. It updates itself. It attests a signed observation - not that the site is safe.

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

Ed25519 Receipt

Receipt ID: be7a2b22-ba26-4a9c-9920-1d36022ab9f0
Output Hash: d6c232686f67caff48d78cb5527339d5191dca7a3d2c55a8635691e284406225
Signature: ed25519:b6d42937daf9b0d81bf949fd98c042d0061454cfebd3c2716b9bad69a9e4722cc4b350d455de69411dabfc13d88a531da4bd3ea67897ce23fd71f505573a2a0e
Public Key: ed25519:d610d74ef18f683e5beb859d241d5e67dff0c122e8928b06bec1c2476f4ba27b
Parent: (genesis)
Plane: fast

Verify this in your browser

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