Rank #1,695Updated November 10, 2026
core.ac.uk
The world’s largest collection of open access research papers
The site runs on Next.js, React, Cloudflare Web Analytics and 2 other technologies. Its email security grade is C. Its SSL certificate is issued by Google Trust Services and is valid for 40 more days.
- Domain age
- —
- Technologies
- 5
- Email security
- C
- SSL days left
- 40
Registration
| Name servers |
|---|
DNS records
| Type | Value | TTL |
|---|---|---|
| A | 188.114.96.3 | 130 |
| A | 188.114.97.3 | 130 |
| MX | core-ac-uk.mail.protection.outlook.com 0 | 300 |
| NS | john.ns.cloudflare.com | 86400 |
| NS | romina.ns.cloudflare.com | 86400 |
| TXT | CC013172-C797-4C59-8252-135EE277A6C7 | 300 |
| TXT | atlassian-domain-verification=ME7l7TGCJ9xfQDWdKMs9sm68zGdtOmB6VYBw/R969AtLbajdxCR8ut8NTe3GEMFR | 300 |
| TXT | google-site-verification=N1l1LngrCrqAZIsIhHlh1UtPsMmM-Bt3PtfK4yM_l58 | 300 |
| TXT | ms-domain-verification=3529416e-6049-41a0-8889-84c4c8e49c25 | 300 |
| TXT | 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 | 300 |
| AAAA | 2a06:98c1:3121::3 | 96 |
| AAAA | 2a06:98c1:3120::3 | 96 |
Technology stack
Analytics
CDN
Programming language
SSL certificate
| Valid | Valid |
|---|---|
| Issuer | US, WE1, Google Trust Services |
| Expires | December 20, 2026 |
| Days remaining | 40 |
| Protocol | TLSv1.3 |
| Names | core.ac.uk, *.core.ac.uk |
Email security
CScore 79/100 across SPF, DMARC, DKIM, MTA-STS and BIMI.
- warnNo MTA-STS: mail sent to you can be downgraded to an unencrypted connection.
- warnNo TLS-RPT record, so you won't hear about failed encrypted deliveries.
- warnNo BIMI record (optional: shows your logo next to your emails in supporting inboxes).
- goodSPF record found.
- goodSPF ends with -all: servers you have not listed are rejected (hard fail).
- goodDMARC policy is quarantine: failing mail goes to spam. Move to p=reject for full protection.
- goodDMARC aggregate reports are sent to mailto:[email protected], mailto:[email protected].
- goodDKIM keys found (selector: selector1, selector2, k1, s1, s2).
- good1 MX record(s) found. Mail is handled by Microsoft 365.
Homepage metadata
| Title | The world’s largest collection of open access research papers |
|---|---|
| Description | The world’s largest collection of open access research papers |
| Language | en |
| Indexable | Yes |
| Word count | 883 |
About core.ac.uk
What technology does core.ac.uk use?
We detected 5 technologies on core.ac.uk, including Cloudflare Web Analytics, Cloudflare, Next.js, React, Node.js.
Does core.ac.uk protect its email with SPF and DMARC?
core.ac.uk scores 79/100 (grade C) for email security. No MTA-STS: mail sent to you can be downgraded to an unencrypted connection. No TLS-RPT record, so you won't hear about failed encrypted deliveries.
What are the name servers of core.ac.uk?
core.ac.uk uses john.ns.cloudflare.com, romina.ns.cloudflare.com.