What powers sdf.org?
Last seen Aug 2026 · 31 technologies across 16 categories
Analytics
CDN
Development
Font scripts
JavaScript frameworks
JavaScript libraries
Message boards
Miscellaneous
Operating Systems
Programming Languages
Rich text editors
Security
Web frameworks
Web Server Extensions
Web Servers
Wikis
AI Crawlers
Doesn't mention any of the 33 AI crawlers we track in its robots.txt; all are allowed by default. Checked Sep 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
- Sep 2026 *: Allowed (was Restricted)
- Sep 2026 gptbot removed from robots.txt
Top search keywords
| Keyword | Position | Est. monthly visits |
|---|---|---|
| sdf | #8 | 980 |
| sdf games | #1 | 15 |
| free shell | #2 | 15 |
| sdf org | #1 | 13 |
| what is unix | #24 | 6 |
| gopherspace | #9 | 5 |
| randy savage cream of the crop | #20 | 2 |
| skylanders wii portal | #15 | 2 |
| interim computer museum | #6 | 2 |
| cream of the crop randy savage | #19 | 1 |
| rubout key | #8 | 1 |
| sdf address | #30 | 1 |
| sdf 9 | #8 | 1 |
| jabber server | #29 | 1 |
| gnu emacs tutorial | #48 | 1 |
| ecl lisp | #11 | 1 |
| ecl common lisp | #11 | 1 |
| free shells | #5 | 1 |
| wii portal of power | #16 | 0 |
| wireless portal skylanders | #11 | 0 |
| color quantizer | #38 | 0 |
| cream of the crop wrestler | #25 | 0 |
| cream always rises to the top macho man | #34 | 0 |
| system functions in c | #49 | 0 |
| system call unix | #81 | 0 |
The site's top keywords in Google (US), with the visits each one is estimated to bring per month.
Top backlinks
Top links pointing at the site, one per source domain, strongest first. The anchor text opens the page carrying the link.
AI Crawlers
No AI crawlers blocked
Audience
- 61% desktop
- 39% phone
United States
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
7.45 / 10 · ranked #19,926 of all domains
1,034 referring domains · OpenPageRank
Search traffic
1,000 est. monthly organic visits (US)
90 keywords in Google's top 30
Core Web Vitals
| LCP | 0.8 s |
| INP | 200 ms |
| CLS | 0 |
| TTFB | 600 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Weight: 0.0 MB · 3 requests
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- SDF Public Access Unix System
- Founded: 1987
From Wikidata (CC0).
Infrastructure
- DNS: sdf.org
- Email: sdf.org
- Email security: SPF (hard fail), DMARC quarantine
- SSL: Let's Encrypt, ECDSA P256, expires Dec 2026
- Common Crawl link graph: rank 30,943, 280 hosts
- Verified with: Google
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| wiki.sdf.org | 10 |
| social.sdf.org | 9 |
| git.sdf.org | 8 |
| mastodon.sdf.org | 8 |
| lemmy.sdf.org | 7 |
| seven1m.sdf.org | 6 |
| www.sdf.org | 6 |
| ssh.sdf.org | 5 |
| laemeur.sdf.org | 4 |
| mx.sdf.org | 4 |
| philosophos.sdf.org | 4 |
| ratter.sdf.org | 4 |
| sdf.org | 4 |
| connect.sdf.org | 3 |
| pixelfed.sdf.org | 3 |
| thomask.sdf.org | 2 |
| turboperl.sdf.org | 2 |
| whoogle.sdf.org | 2 |
| akrl.sdf.org | 1 |
| every.sdf.org | 1 |
| ldbeth.sdf.org | 1 |
| old.lemmy.sdf.org | 1 |