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Diploma Professional & Scientific Services

FTSE 100 constituent (DPLM)

Overview

Diploma sits in the Professional & Scientific Services sector. Its primary web presence is diplomaplc.com, with two subdomains on record: www.diplomaplc.com and salesexcellence.diplomaplc.com. A crawl of www.diplomaplc.com fetched 200 pages, tracing 3972 internal links and 44 external links, including brrmedia.news, herculesoem.com and player.vimeo.com. Its TLS certificate is issued by DigiCert Inc, with HSTS and a Content-Security-Policy header both present. Hosting runs on Microsoft Corporation infrastructure, ASN 8075, US. Mail routes through Mimecast's EU inbound servers; SPF is configured, DMARC policy is "none". The domain is registered through Register.com - Network Solutions, LLC: registered 2000-10-24, expiring 2033-10-24. Companies House lists company number 03899848, status Active, incorporated 1999-12-24, under SIC code 70100 - Activities of head offices, with no previous company names and zero persons of significant control on record.

Generated from the data on this page and independently fact-checked against it.

Web presence

Primary domain: diplomaplc.com. 2 subdomains observed via Certificate Transparency and direct crawl.

200 pages fetched from www.diplomaplc.com on 2026-08-26 — 3972 internal links observed, 362614530 bytes. Page title: “Home - Diploma PLCDiploma PLC”

TLS issued by DigiCert Inc, valid 2026-06-20 – 2026-12-20. — HSTS enabled, CSP present, X-Frame-Options: SAMEORIGIN.

Links out to 44 external domains (from the crawled site, most recent pass): brrmedia.news, dicsaes.com, fittresources.com.au, herculesoem.com, herculesus.com, lnkd.in, office.microsoft.com, player.vimeo.com, register.fca.org.uk, secure.emincote.com, security-eu.mimecast.com, stream.brrmedia.co.uk, sw.dk, tieindustrial.com, vantageendoscopy.com, vsptechnologies.com, windycitywire.com, www.abacusdx.com, www.accuscience.ie, www.adobe.com, www.alphalabs.co.uk, www.amtsurgical.com, www.biggreen.com.au, www.browsehappy.com, www.brrmedia.co.uk, www.clarendonsf.com, www.computershare.co.uk, www.design-portfolio.co.uk, www.euroland.com, www.fca.org.uk, www.ico.org.uk, www.isgroup-international.com, www.kungshusen.se, www.legislation.gov.uk, www.linkedin.com, www.m-seals.com, www.pafcorp.com, www.rgfluidpower.com, www.rnib.org.uk, www.shoal-group.com, www.somagen.com, www.techno-path.com, www.techsil.co.uk, www.w3.org

Infrastructure

Hosted on: AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US (US)

Mail: eu-smtp-inbound-1.mimecast.com, eu-smtp-inbound-2.mimecast.com. SPF present. DMARC policy: none. Nameservers: dns105.register.com, dns106.register.com.

Registered via Register.com - Network Solutions, LLC. Registered 2000-10-24. Expires 2033-10-24.

Digital sovereignty

1/5 — categories confirmed not tied to a US-controlled company, out of DNS, registrar, TLS certificate, host and mail. Ultimate ownership, not the jurisdiction of the specific entity observed: a subsidiary like Google Ireland still counts as American. See the full cross-index comparison.

US DNS · US Registrar · US TLS certificate · US Primary host · OK Inbound mail

DNS: Register.com. Registrar: Network Solutions. TLS certificate: DigiCert, Inc.. Primary host: Microsoft Corporation.

Vendor footprint

Third-party vendors identified from this company's own published DNS — apex TXT domain-verification tokens and SPF include: mechanisms. See the full vendor footprint comparison.

Microsoft 365 Mimecast

Corporate record

Company number 03899848, Active, incorporated 1999-12-24. SIC: 70100 - Activities of head offices. Registered office: 10-11 CHARTERHOUSE SQUARE, LONDON, EC1M 6EE. Last confirmation statement: 2025-12-22. Last accounts made up: 2025-09-30.

Persons with significant control (from the public register; month/year of birth only, matching Companies House's own disclosure limit):

• No active PSC entries on the public register.

Public engineering footprint

No public GitHub organisation identified.