Websites using C1 CMS (Composite C1)
C1 CMS, formerly Composite C1, is an open-source ASP.NET content management system. 3 websites in the PageSourceSearch index contain the code that reveals it; the 3 highest-ranked are listed below.
How is C1 CMS (Composite C1) detected?
Media files are served from the CMS's /Renderers/ShowMedia.ashx handler. The discovery keyword is the exact bytes PageSourceSearch looks for in every stored page and script:
/Renderers/[Ss]how[Mm]edia\.ashx regex Search the index for it
A literal is matched byte for byte, case-sensitively. Combine it with another keyword, a domain, a kind or a date filter on the search page to narrow the list. About C1 CMS (Composite C1)
Top 50 websites using C1 CMS (Composite C1)
Ranked by the domain's position in the crawl's ranked list (Common Crawl harmonic centrality), highest first. view source opens the stored page or script with the match highlighted. Computed 2026-09-29 17:02:43 UTC.
| # | Website | Rank | Found in | |
|---|---|---|---|---|
| 1 | oapecorg.org | 654,972 | html https://oapecorg.org/Home | view source profile |
| 2 | trojka.dk | 1,042,771 | html https://trojka.dk/ | view source profile |
| 3 | sensr.com | 1,332,417 | html https://sensr.com/ | view source profile |
How it appears in the source
From oapecorg.org (html):
<img id="ctl00_ctl11_Parent_level_ctl01_Child_level_ctl01_currImage" src="/Renderers/ShowMedia.ashx?id=MediaArchive:7110e52b-2e5c-46a6-ba52-1969c570b96e" />
Questions about finding C1 CMS (Composite C1)
- How does PageSourceSearch know a website uses C1 CMS (Composite C1)?
- By the source itself: Media files are served from the CMS's /Renderers/ShowMedia.ashx handler. PageSourceSearch stores the raw HTML and first-party JavaScript of each crawled site and matches the keyword byte for byte, so every listed site's stored source contains it.
- Is this a complete list of websites using C1 CMS (Composite C1)?
- No. The page lists the 50 highest-ranked sites in the index whose source holds the keyword, out of 3 websites that do; the count is the index's estimate at the time the list was computed. Run the keyword as a search to page through all of them, or add a kind or date filter.
- How do I find websites that use C1 CMS (Composite C1) together with another technology?
- Search for both keywords at once: several terms separated by spaces must all be found on the same site, or with the Same page toggle in the same page. For example /Renderers/[Ss]how[Mm]edia\.ashx with wp-content/plugins/ lists the WordPress sites that use C1 CMS (Composite C1).