What powers rpsl.org.uk?
Last seen Aug 2026 · 29 technologies across 18 categories
Analytics
CDN
CMS
Databases
Font scripts
Hosting
JavaScript libraries
Miscellaneous
Page builders
Performance
Programming languages
Security
UI frameworks
Web frameworks
Web servers
Webmail
WordPress plugins
WordPress themes
AI Crawlers
Doesn't name any of the 33 AI crawlers we track in its robots.txt. Catch-all rules (User-agent: *) restrict some paths for every crawler, AI or not. Checked Sep 2026.
- robots.txt found
- llms.txt found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Standards: llms.txt
Audience
- 81% desktop
- 19% phone
United Kingdom
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.20 / 10 · ranked #453,535 of all domains
78 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.7 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 900 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: English (United Kingdom)
- Weight: 3.1 MB · 65 requests
- WordPress theme: kadence · all themes
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- The Royal Philatelic Society London (Royal Philatelic Society London on Wikidata)
- Founded: 1869
- Sector: higher education
- Country: United Kingdom
- Profiles: Facebook, X, Instagram, YouTube
From the homepage's own structured data (Sep 2026) and Wikidata (CC0).
Infrastructure
- Hosted on TBSH (109.73.124.64)
- DNS: stackdns.com
- Email: no MX record returned, SPF names Microsoft 365
- Email security: SPF (hard fail), DMARC monitor only
- SSL: Let's Encrypt, RSA 2048, wildcard, expires Nov 2026
- Common Crawl link graph: rank 538,883, 6 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| home.rpsl.org.uk | 23 |
| members.rpsl.org.uk | 10 |
| www.rpsl.org.uk | 9 |
Full technology history →
Report an incorrect detection
Recent changes
- detected Lightbox Aug 2026
- dropped Lightbox Jul 2026
- detected Lightbox May 2026
- dropped Google Tag Manager Nov 2025