Checking results for: substackcdn.com
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substackcdn.com is ONLINE
Additional info for https://substackcdn.com
Technical Information
| HTTP Status Code | 403 |
| HTTP Version | HTTP/1.1 |
| HTTPS | ✔ Available |
| IP Address | 18.244.28.46 |
| Server Software | AmazonS3 |
| CDN | AWS CloudFront |
|
🚫 🟡 HTTP 403 Error | The server returned a 403 error. Check the access configuration. |
|
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. |
|
ℹ 🔵 Missing X-Frame-Options | The site can be embedded in iframes by third parties (clickjacking risk). |
HTTP Status Code 403
HTTP Version HTTP/1.1
HTTPS ✔ Available
IP Address 18.244.28.46
Server Software AmazonS3
CDN AWS CloudFront
🚫 🟡 HTTP 403 Error The server returned a 403 error. Check the access configuration.
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.
ℹ 🔵 Missing X-Frame-Options The site can be embedded in iframes by third parties (clickjacking risk).
Performance
| DNS Lookup | 4.1 ms |
| TCP Connect | 4.8 ms |
| TLS Handshake | 5 ms |
| Time To First Byte (TTFB) | 133.9 ms |
| Content Download | 0 ms |
| Total Response Time | 134 ms |
DNS Lookup 4.1 ms
TCP Connect 4.8 ms
TLS Handshake 5 ms
Time To First Byte (TTFB) 133.9 ms
Content Download 0 ms
Total Response Time 134 ms
Security
| HTTPS | ✔ Enabled |
| HSTS | ✘ Not configured |
| CSP | ⚠ Not configured |
| X-Frame-Options | ⚠ Not configured |
| X-Content-Type-Options | ⚠ Not configured |
| HTTP/2 | ⚠ HTTP/1.1 |
HTTPS ✔ Enabled
HSTS ✘ Not configured
CSP ⚠ Not configured
X-Frame-Options ⚠ Not configured
X-Content-Type-Options ⚠ Not configured
HTTP/2 ⚠ HTTP/1.1
SEO Quick Check
Title Error - Substack
Detected Technologies
Technology Cloudflare
HTTP Headers
| Content-type | text/html |
| Content-length | 5672 |
| Last-modified | Fri, 03 Feb 2023 22:02:04 GMT |
| Etag | "bca1df02a0628fc70e30b2da04196f86" |
| X-amz-error-code | AccessDenied |
| X-amz-error-message | Access Denied |
| Date | Wed, 29 Jul 2026 09:43:13 GMT |
| Server | AmazonS3 |
| X-cache | Error from cloudfront |
| Via | 1.1 bcdbf1400b5b04e46f310591b86ea9b8.cloudfront.net (CloudFront) |
| X-amz-cf-pop | CDG52-P5 |
| Alt-svc | h3=":443"; ma=86400 |
| X-amz-cf-id | TOZQX7x3WTUmxn9ad6fNugL0L3Vvzh36Q6XX_Og2VQB7twNKR1SyYg== |
Meta Tags
| Viewport | width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0 |
Content-type text/html
Content-length 5672
Last-modified Fri, 03 Feb 2023 22:02:04 GMT
Etag "bca1df02a0628fc70e30b2da04196f86"
X-amz-error-code AccessDenied
X-amz-error-message Access Denied
Date Wed, 29 Jul 2026 09:43:13 GMT
Server AmazonS3
X-cache Error from cloudfront
Via 1.1 bcdbf1400b5b04e46f310591b86ea9b8.cloudfront.net (CloudFront)
X-amz-cf-pop CDG52-P5
Alt-svc h3=":443"; ma=86400
X-amz-cf-id TOZQX7x3WTUmxn9ad6fNugL0L3Vvzh36Q6XX_Og2VQB7twNKR1SyYg==
Viewport width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0
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