🌐
spring.dev 200
🔒 SSL Valid
HTTP Status A three-digit code showing if the site loaded successfully (200), redirects (301/302), or has errors (4xx/5xx).Read more →
200
SSL Expires When the SSL certificate expires. An expired certificate causes browser security warnings.Read more →
in 45d
Domain Expires When the domain registration expires. If not renewed, the domain becomes available to others.Read more →
N/A
Hosting The company and location where this website's server is physically located.Read more →
Unknown
Security Score based on key HTTP security headers: HSTS, Content-Security-Policy, and X-Frame-Options.Read more →
2/3
IP Address The numerical address of the server hosting this website. Reveals location, provider, and network.Read more →
104.21.4.240
Performance Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability.
51
mob
Uptime
100%
Performance Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability. 51
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Mobile
Score
Accessibility
Best Practices
SEO
LCP
10.16s
CLS
0.000
FCP
3.18s
TTFB
0.01s
TBT
624ms
SI
4.81s
Desktop
Score
Accessibility
Best Practices
SEO
LCP
1.33s
CLS
0.009
FCP
0.75s
TTFB
0.01s
TBT
1,016ms
SI
1.25s
Checked: 2026-09-05 18:48:16.613263 · View on PageSpeed
Tech Stack Technologies detected on this website: CMS, frameworks, libraries, CDN, and analytics tools.
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No technologies detected
Screenshot
2026-09-02
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Captured: 2026-09-02 15:07:28 · 8.9 KB
DNS Records DNS translates domain names to IP addresses. Records control where the site, email, and services are directed.Read more →
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| A (IPv4) | 104.21.4.240172.67.187.58 |
| AAAA (IPv6) | 2606:4700:3030::6815:4f02606:4700:3030::ac43:bb3a |
| NS | theo.ns.cloudflare.commary.ns.cloudflare.com |
| TXT (1) |
v=spf1 -all |
WHOIS / RDAP Public registration data: who registered the domain, when, and when it expires.Read more →
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| Registrar | N/A |
| Registered | N/A |
| Expires | N/A |
| Last Updated | N/A |
SSL Certificate Encrypts the connection between browsers and this website. Valid SSL = HTTPS works.Read more → Valid
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| Subject (CN) | spring.dev |
| Issuer | Google Trust Services |
| Valid From | 2026-09-01 |
| Valid Until | 2026-11-30 (45 days left) |
| SANs (2) | spring.dev*.spring.dev |
HTTP Headers Metadata sent by the server: reveals software, caching rules, and security configuration.Read more →
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| Status | 200 |
| Server | cloudflare |
| Content-Type | text/html; charset=utf-8 |
| Final URL | https://spring.io/ |
| strict-transport-security | max-age=15552000; includeSubDomains |
| x-frame-options | DENY |
| x-content-type-options | nosniff |
| referrer-policy | same-origin |
| cache-control | public, max-age=0, must-revalidate |
| cf-ray | a4b6d2097da9f012-IAD |
Security headers HTTP headers that protect visitors from attacks. HSTS forces HTTPS, CSP controls resource loading, X-Frame-Options prevents clickjacking.Read more →
Hosting Physical infrastructure: where the server is, who operates it, and what network it belongs to.Read more →
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| IP Address | 104.21.4.240 |
| Provider | Unknown |
| Organization | N/A |
| ASN | N/A |
| Location | N/A |
Security Score
B (5/7)
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Sitemap & Robots
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No robots.txt
This site has no robots.txt file, so crawlers may access everything by default.
| Sitemap | Not found |
Social & Meta Tags
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No meta tags detected.
Mail Security Email authentication records (SPF & DMARC) that prevent spoofing and phishing from this domain.Read more →
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| SPF | ✓ Present v=spf1 -all |
| DMARC | ✓ Present v=DMARC1; p=reject; fo=1; sp=reject; adkim=s; aspf=s; rua=mailto:[email protected] |
Other TLDs Other top-level domain variants of this domain name and their availability. 18 active 5 for sale
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Uptime Monitor
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| Current Status | 🟢 Online |
| HTTP Status | 200 |
| Response Time | 152ms |
| Last Checked | 2026-10-15 21:30:09.422069 |
| Uptime (30d) | 100% |
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