Technical Information
| HTTP Status Code | 200 |
| HTTP Version | HTTP/1.1 |
| HTTPS | ✔ Available |
| IP Address | 128.138.135.43 |
| Server Software | Apache/2.4.52 (Ubuntu) |
| Compression | gzip |
|
🔒 🟡 Mixed Content (1 HTTP resources) | The page is served over HTTPS but loads 1 resource(s) over HTTP. This may be blocked in modern browsers. |
|
ℹ 🔵 Missing HSTS | HTTP Strict Transport Security is not configured. Recommended for HTTPS sites. |
|
ℹ 🔵 Missing Content Security Policy | CSP is not configured. It helps prevent XSS attacks and content injection. |
HTTP Status Code 200
HTTP Version HTTP/1.1
HTTPS ✔ Available
IP Address 128.138.135.43
Server Software Apache/2.4.52 (Ubuntu)
Compression gzip
🔒 🟡 Mixed Content (1 HTTP resources) The page is served over HTTPS but loads 1 resource(s) over HTTP. This may be blocked in modern browsers.
ℹ 🔵 Missing HSTS HTTP Strict Transport Security is not configured. Recommended for HTTPS sites.
ℹ 🔵 Missing Content Security Policy CSP is not configured. It helps prevent XSS attacks and content injection.
Redirect Chain
| # | URL | HTTP Status Code | Status |
| 1 | https://nsidc.org:443 | 301 | HTTP/1.1 301 Moved Permanently |
| 2 | https://nsidc.org/home | 200 | HTTP/1.1 200 OK |
#1 URL https://nsidc.org:443
HTTP Status Code 301
Status HTTP/1.1 301 Moved Permanently
#2 URL https://nsidc.org/home
HTTP Status Code 200
Status HTTP/1.1 200 OK
Performance
| DNS Lookup | 0.5 ms |
| TCP Connect | 119.3 ms |
| TLS Handshake | 119.1 ms |
| Time To First Byte (TTFB) | 373.3 ms |
| Content Download | 116.7 ms |
| Total Response Time | 490.1 ms |
DNS Lookup 0.5 ms
TCP Connect 119.3 ms
TLS Handshake 119.1 ms
Time To First Byte (TTFB) 373.3 ms
Content Download 116.7 ms
Total Response Time 490.1 ms
Security
| HTTPS | ✔ Enabled |
| HSTS | ✘ Not configured |
| CSP | ⚠ Not configured |
| X-Frame-Options | ✔ SAMEORIGIN |
| X-Content-Type-Options | ✔ nosniff |
| HTTP/2 | ⚠ HTTP/1.1 |
HTTPS ✔ Enabled
HSTS ✘ Not configured
CSP ⚠ Not configured
X-Frame-Options ✔ SAMEORIGIN
X-Content-Type-Options ✔ nosniff
HTTP/2 ⚠ HTTP/1.1
SEO Quick Check
| Title | Homepage | National Snow and Ice Data Center |
| Canonical | https://nsidc.org/home |
Title Homepage | National Snow and Ice Data Center
Canonical https://nsidc.org/home
Detected Technologies
| Technology | Drupal Bootstrap jQuery Google Analytics Google Tag Manager Cloudflare Apache Hotjar |
Technology Drupal Bootstrap jQuery Google Analytics Google Tag Manager Cloudflare Apache Hotjar
HTTP Headers
| Date
| Fri, 24 Jul 2026 16:05:11 GMT |
| Server
| Apache/2.4.52 (Ubuntu) |
| Cache-Control
| max-age=900, public |
| X-Drupal-Dynamic-Cache
| UNCACHEABLE (poor cacheability) |
| Content-language
| en |
| X-Content-Type-Options
| nosniff |
| X-Frame-Options
| SAMEORIGIN |
| Expires
| Sun, 19 Nov 1978 05:00:00 GMT |
| Vary
| Cookie,Accept-Encoding |
| X-Generator
| Drupal 11 (https://www.drupal.org) |
| Content-Security-Policy-Report-Only
| report-uri /report-csp-violation |
| X-XSS-Protection
| 1; mode=block |
| From-Origin
| same |
| X-Drupal-Cache
| HIT |
| Content-Encoding
| gzip |
| Content-Type
| text/html; charset=UTF-8 |
| Transfer-Encoding
| chunked |
Meta Tags
| Generator | Drupal 11 (https://www.drupal.org) |
| MobileOptimized | width |
| HandheldFriendly | true |
| Viewport | width=device-width, initial-scale=1, shrink-to-fit=no |
| X-ua-compatible | ie=edge |
Date Fri, 24 Jul 2026 16:05:11 GMT
Server Apache/2.4.52 (Ubuntu)
Cache-Control max-age=900, public
X-Drupal-Dynamic-Cache UNCACHEABLE (poor cacheability)
Content-language en
X-Content-Type-Options nosniff
X-Frame-Options SAMEORIGIN
Expires Sun, 19 Nov 1978 05:00:00 GMT
Vary Cookie,Accept-Encoding
X-Generator Drupal 11 (https://www.drupal.org)
Content-Security-Policy-Report-Only report-uri /report-csp-violation
X-XSS-Protection 1; mode=block
From-Origin same
X-Drupal-Cache HIT
Content-Encoding gzip
Content-Type text/html; charset=UTF-8
Transfer-Encoding chunked
