klein4d.com
klein4d.com is a live English-language website hosted on YISU CLOUD LTD (AS138152) in the United States, served by Nginx. cl0q first saw it on 2026-10-16 and last crawled it on 2026-10-16. It resolves to 156.232.13.187 and has mail (MX) records set up. Its favicon is fingerprinted by SHA-256, so you can find every other site that serves the same icon.
How the site describes itself:
4D Klein bottle
This Klein bottle, I heard it will never be filled up? Where can I buy it? Go here! Let is start exploring topology from this moment, it is very interesting.
| Status | 200 OK — live & indexed by cl0q |
|---|---|
| First seen | 2026-10-16 |
| Last crawled | 2026-10-16 |
| IPv4 | 156.232.13.187 |
| Network | AS138152 YISU CLOUD LTD · United States |
| Mail (MX) | mxbiz1.qq.com,mxbiz2.qq.com |
| Language | en |
| Server | nginx |