🌐
go.dev 200
🔒 SSL Valid
✨ About this site
Official website for the open source Go programming language.
📊 What the data says
Registered in 2019, this site runs on the Google Frontend and uses jQuery with Google Tag Manager and Fonts. It is currently active with valid SSL, HSTS, and CSP security headers.
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 64d
Domain Expires When the domain registration expires. If not renewed, the domain becomes available to others.Read more →
in 119d
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 →
216.239.34.21
Performance Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability.
N/A
Uptime
100%
Performance Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability.
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Performance data not available yet.
Tech Stack Technologies detected on this website: CMS, frameworks, libraries, CDN, and analytics tools. 3
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📊 Analytics
Google Tag Manager
🔤 Font/Icon
Google Fonts
📦 JS Library
jQuery
Screenshot
Processing...
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⏳
Screenshot is being captured...
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) | 216.239.38.21216.239.34.21216.239.36.21216.239.32.21 |
| AAAA (IPv6) | 2001:4860:4802:38::152001:4860:4802:36::152001:4860:4802:32::152001:4860:4802:34::15 |
| NS | ns-cloud-e3.googledomains.comns-cloud-e4.googledomains.comns-cloud-e1.googledomains.comns-cloud-e2.googledomains.com |
| MX | 5 alt1.aspmx.l.google.com1 aspmx.l.google.com5 alt2.aspmx.l.google.com10 alt4.aspmx.l.google.com10 alt3.aspmx.l.google.com |
| TXT (5) |
Services configured via TXT:
Google5
Show all TXT recordsgoogle-site-verification=eqtrduRyMRS8TuoUEuYMF-u9_IDRMd1In6T6E1gTchU google-site-verification=qvibgBDBD_1VeFXvgduqw1cmDeMpAS_qBCZCFauYduk google-site-verification=3oHHTSOKrjE9J8SIvyj3gUxEtDjmr5oNZ-DbB271vpM google-site-verification=mJdpiJi2GyNG9nz7sctCXgJnzDHzdFzfhOqTTDuMR0s google-site-verification=eYE-BIP9BY8VZCUI_r8sJi7qjRVtxyRQSlbZmeVVlzE |
WHOIS / RDAP Public registration data: who registered the domain, when, and when it expires.Read more →
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| Registrar | MarkMonitor Inc. |
| Registered | 2019-02-13 |
| Expires | 2027-02-13 (in 119 days) |
| Last Updated | 2026-01-17 |
| Status | client delete prohibitedclient transfer prohibitedclient update prohibited |
SSL Certificate Encrypts the connection between browsers and this website. Valid SSL = HTTPS works.Read more → Valid
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| Subject (CN) | go.dev |
| Issuer | Google Trust Services |
| Valid From | 2026-09-21 |
| Valid Until | 2026-12-20 (64 days left) |
| SANs (1) | go.dev |
HTTP Headers Metadata sent by the server: reveals software, caching rules, and security configuration.Read more →
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| Status | 200 |
| Server | Google Frontend |
| Content-Type | text/html; charset=utf-8 |
| Final URL | https://go.dev/ |
| strict-transport-security | max-age=31536000; includeSubDomains; preload |
| content-security-policy | connect-src 'self' www.google-analytics.com stats.g.doubleclick.net ; default-src 'self' ; font-src 'self' fonts.googleapis.com fonts.gstatic.com data: ; frame-ancestors 'self' ; frame-src 'self' www.google.com feedback.googleusercontent.com www.googletagmanager.com scone-pa.clients6.google.com www.youtube.com player.vimeo.com ; img-src 'self' www.google.com www.google-analytics.com ssl.gstatic.com www.gstatic.com gstatic.com data: * ; object-src 'none' ; script-src 'self' 'sha256-n6OdwTrm52KqKm6aHYgD0TFUdMgww4a0GQlIAVrMzck=' 'sha256-4ryYrf7Y5daLOBv0CpYtyBIcJPZkRD2eBPdfqsN3r1M=' 'sha256-sVKX08+SqOmnWhiySYk3xC7RDUgKyAkmbXV2GWts4fo=' www.google.com apis.google.com www.gstatic.com gstatic.com support.google.com www.googletagmanager.com www.google-analytics.com ssl.google-analytics.com tagmanager.google.com ; style-src 'self' 'unsafe-inline' fonts.googleapis.com feedback.googleusercontent.com www.gstatic.com gstatic.com tagmanager.google.com ; |
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 | 216.239.34.21 |
| Provider | Unknown |
| Organization | N/A |
| ASN | N/A |
| Location | N/A |
Security Score
D (3/7)
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Sitemap & Robots
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Open to search engines
This site's robots.txt lets crawlers access its main content. Search engines can index it normally.
No paths are disallowed — everything is crawlable.
| Sitemap | Not found |
Social & Meta Tags
Partial
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| Title | The Go Programming Language |
| Description | Go is an open source programming language that makes it simple to build secure, scalable systems. |
| Twitter Card | summary |
| Twitter Image | https://go.dev/doc/gopher/gopherbelly300.jpg |
| Canonical URL | https://go.dev/ |
| Language | en |
Mail Security Email authentication records (SPF & DMARC) that prevent spoofing and phishing from this domain.Read more →
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| SPF | Not set |
| DMARC | Not set |
| MX Records | 5 → alt1.aspmx.l.google.com 1 → aspmx.l.google.com 5 → alt2.aspmx.l.google.com 10 → alt4.aspmx.l.google.com 10 → alt3.aspmx.l.google.com |
Other TLDs Other top-level domain variants of this domain name and their availability. 15 active 5 for sale 3 available
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Uptime Monitor
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| Current Status | 🟢 Online |
| HTTP Status | 200 |
| Response Time | 118ms |
| Last Checked | 2026-10-16 13:30:52.178235 |
| Uptime (30d) | 100% |
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