Summary
- HTTP status
- 200
- IP address
- 106.0.62.83
- ASN
- AS2444
- Hosting provider
- Transferred to the ARIN region on 2021-10-08T10:48:28Z.
- Country
- ZZ
- Title
- Active Calculus | Free resources for students; free and open-source materials for instructors.
- Description
- —
- Language
- en-US
- Server
- LiteSpeed · PHP/8.1.34
- Generator
- WordPress 7.1.2
- Certificate
- ValidLet's Encrypt
- Sitemap
- Present
- Domain name
- activecalculus.org
SSL/TLS certificate
The SSL/TLS certificate encrypts exchanges between visitors and the website (HTTPS) and proves its identity. It is issued by a certificate authority after a more or less thorough check: of the domain name only (DV), of the organization that owns it (OV), or extended validation (EV).
Free certificate issued by Let's Encrypt: valid for a few months, it is renewed automatically.
- Certificate authority
- Let's Encrypt (YR2)
- Validation type
- Domain validation (DV)
- Status
- Valid
- Covered domains
- *.activecalculus.com, *.activecalculus.org, activecalculus.com, activecalculus.org
- Valid from
- August 28, 2026
- Valid until
- November 26, 2026 (expires in 54 days)
- Protocol
- TLSv1.3
- Key
- RSA 2048 bits
Sitemap
A sitemap lists the pages of a website to help search engines discover them. It can have any name when it is declared in the robots.txt file.
The robots.txt file does not declare any sitemap: the usual locations were checked.
| File | Content | Last modified |
|---|---|---|
| https://activecalculus.org/sitemap.xml | Index of 6 sitemaps | — |
| https://activecalculus.org/wp-sitemap.xml | Index of 6 sitemaps | — |
Redirects
The website address does not redirect.
Outgoing links
The home page links to 10 other websites.