Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.DCDN & DeliveryActionNo CDN detectedFIX
Consider using a CDN to improve global delivery speed and reduce origin load.
CIPv6 ReadinessActionNo IPv6 supportREVIEW
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.
Source: Google IPv6 stats
CCrawlabilityActionrobots.txt present, sitemap with 0 URLsREVIEW
Search engines may not be able to parse the sitemap. Fix XML validation errors.
An unparseable sitemap is silently ignored by Google — the URLs it advertises are never queued for crawl.
Learn more ▾ ▴
Google's sitemap parser is strict about XML validity. A single unescaped `&` or unclosed tag invalidates the whole file. Run your sitemap through a validator (Search Console's Sitemaps report flags it) and fix the offending entry. Most generators escape correctly; mistakes usually come from manually-written entries.
Source: sitemaps.org / Google Search Central
An empty sitemap provides no value. Add <url> entries for your pages.
An empty sitemap signals 'no content to index' to Google — actively harmful versus having no sitemap at all.
Learn more ▾ ▴
Google compares URLs in the sitemap against URLs it has crawled. An empty sitemap on a site with thousands of pages signals abandonment. Either populate it correctly (most CMSes auto-generate) or delete the file and let Google crawl normally.
Source: Google Search Central / sitemaps.org
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.
robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.
Source: sitemaps.org
<!doctype html>
<html
lang="en"
dir="ltr">
<head>
<meta name="google-signin-client-id" content="721724668570-nbkv1cfusk7kk4eni4pjvepaus73b13t.apps.googleusercontent.com"><meta name="google-signin-scope"
content="profile email https://www.googleapis.com/auth/developerprofiles https://www.googleapis.com/auth/developerprofiles.award https://www.googleapis.com/auth/devprofiles.full_control.firstparty"><meta property="og:site_name" content="Firebase">
<meta property="og:type" content="website"><meta name="theme-color" content="#a8c7fa"><meta charset="utf-8">
<meta content="IE=Edge" http-equiv="X-UA-Compatible">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="manifest" href="/_pwa/firebase/manifest.json"
crossorigin="use-credentials">
<link rel="preconnect" href="//www.gstatic.com" crossorigin>
<link rel="preconnect" href="//fonts.googleapis.com" crossorigin>
<link rel="preconnect" href="//www.google-analytics.com" crossorigin><link rel="stylesheet" href="//fonts.googleapis.com/css?family=Google+Sans:400,500|Roboto:400,400italic,500,500italic,700,700italic|Roboto+Mono:400,500,700&display=swap">
<link rel="stylesheet"
href="//fonts.googleapis.com/css2?family=Material+Icons&family=Material+Symbols+Outlined&display=block"><link rel="stylesheet" href="https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/css/app.css">
<link rel="stylesheet" href="https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/css/dark-theme.css" disabled>
<link rel="shortcut icon" href="https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/images/favicon.png">
<link rel="apple-touch-icon" href="https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/images/touchicon-180.png"><link rel="canonical" href="https://firebase.google.com/products/crashlytics"><link rel="search" type="application/opensearchdescription+xml"
title="Firebase" href="https://firebase.google.com/s/opensearch.xml">
<link rel="alternate" hreflang="en"
href="https://firebase.google.com/products/crashlytics" /><link rel="alternate" hreflang="x-default" href="https://firebase.google.com/products/crashlytics" /><link rel="alternate" hreflang="zh-Hans"
href="https://firebase.google.com/products/crashlytics?hl=zh-cn" /><link rel="alternate" hreflang="id"
href="https://firebase.google.com/products/crashlytics?hl=id" /><link rel="alternate" hreflang="ja"
href="https://firebase.google.com/products/crashlytics?hl=ja" /><link rel="alternate" hreflang="ko"
href="https://firebase.google.com/products/crashlytics?hl=ko" /><link rel="alternate" hreflang="pt-BR"
href="https://firebase.google.com/products/crashlytics?hl=pt-br" /><link rel="alternate" hreflang="es-419"
href="https://firebase.google.com/products/crashlytics?hl=es-419" /><title>Firebase Crashlytics | Track, prioritize, and fix app crashes faster</title>
<meta property="og:title" content="Firebase Crashlytics | Track, prioritize, and fix app crashes faster"><meta name="description" content="Explore how Firebase Crashlytics provides realtime app crash &amp; stability reporting for iOS, Android, Flutter, and Unity apps so you can fix crashes faster.">
<meta property="og:description" content="Explore how Firebase Crashlytics provides realtime app crash &amp; stability reporting for iOS, Android, Flutter, and Unity apps so you can fix crashes faster."><meta property="og:url" content="https://firebase.google.com/products/crashlytics"><meta property="og:locale" content="en"><script type="application/ld+json">
{
"@context": "https://schema.org",
"@type": "Article",
"headline": "Firebase Crashlytics | Track, prioritize, and fix app crashes faster"
}
</script>
<meta content="IE=edge" http-equiv="X-UA-Compatible"/>
<meta content="width=device-width, initial-scale=1" name="viewport"/>
<meta content="Firebase Crashlytics | Track, prioritize, and fix app crashes faster" name="name"/>
<meta content="https://firebase.google.com/images/social.png" name="image"/>
<meta content="Firebase Crashlytics | Track, prioritize, and fix app crashes faster" name="twitter:title"/>
<meta content="Explore how Firebase Crashlytics provides realtime app crash & stability reporting for iOS, Android, Flutter, and Unity apps so you can fix crashes faster.
" name="twitter:description"/>
<meta content="@firebase" name="twitter:site"/>
<meta content="firebase.google.com" name="twitter:domain"/>
<meta content="/images/products/crashlytics/crashlytics-2.png" name="twitter:image"/>
<meta name="twitter:image:alt" value=""/>
<meta name="twitter:card" value=""/>
<meta content="Firebase Crashlytics | Track, prioritize, and fix app crashes faster" property="og:title"/>
<meta content="website" property="og:type"/>
<meta content="https://firebase.google.com/products/crashlytics/" property="og:url"/>
<meta content="https://firebase.google.com/images/social.png" property="og:image"/>
<meta content="Explore how Firebase Crashlytics provides realtime app crash & stability reporting for iOS, Android, Flutter, and Unity apps so you can fix crashes faster.
" property="og:description"/>
<meta content="no" name="msapplication-tap-highlight"/>
<link href="https://fonts.googleapis.com/css2?family=JetBrains+Mono:ital,wght@0,100..800;1,100..800&display=swap" rel="stylesheet" data-page-link><link href="https://fonts.googleapis.com/css?family=Google+Sans:400,500,600,700" rel="stylesheet" data-page-link>
</head>
<body class="firebase-page-product firebase__bg--white firesite-lang--en firebase-page-product firebase__bg--white color-scheme--light"
template="page"
theme="firebase-icy-theme"
type="article"
appearance="device"
appearance
layout="full"
free-trial
concierge='hide'
pending>
<devsite-progress type="indeterminate" id="app-progress"></devsite-progress>
<a href="#main-content" class="skip-link button">
Skip to main content
</a>
<section class="devsite-wrapper">
<devsite-cookie-notification-bar></devsite-cookie-notification-bar>
<devsite-header role="banner" keep-tabs-visible>
<div class="devsite-header--inner" data-nosnippet>
<div class="devsite-top-logo-row-wrapper-wrapper">
<div class="devsite-top-logo-row-wrapper">
<div class="devsite-top-logo-row">
<button type="button" id="devsite-hamburger-menu"
class="devsite-header-icon-button button-flat material-icons gc-analytics-event"
data-category="Site-Wide Custom Events"
data-label="Navigation menu button"
visually-hidden
aria-label="Open menu">
</button>
<div class="devsite-product-name-wrapper">
<a href="/" class="devsite-site-logo-link gc-analytics-event"
data-category="Site-Wide Custom Events" data-label="Site logo" track-type="globalNav"
track-name="firebase" track-metadata-position="nav"
track-metadata-eventDetail="nav">
<picture>
<source srcset="https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/images/lockup.svg"
media="(prefers-color-scheme: dark)"
class="devsite-dark-theme">
<img src="https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/images/lockup.svg" class="devsite-site-logo" alt="Firebase">
</picture>
</a>
</div>
<div class="devsite-top-logo-row-middle">
<div class="devsite-header-upper-tabs">
<devsite-tabs class="upper-tabs">
<nav class="devsite-tabs-wrapper" aria-label="Upper tabs">
<tab class="devsite-dropdown
">
<a href="https://firebase.google.com/products-build"
class="devsite-tabs-content gc-analytics-event "
track-metadata-eventdetail="https://firebase.google.com/products-build"
track-type="nav"
track-metadata-position="nav - build"
track-metadata-module="primary nav"
data-category="Site-Wide Custom Events"
data-label="Tab: Build"
track-name="build"
>
Build
</a>
<button
aria-haspopup="menu"
aria-expanded="false"
aria-label="Dropdown menu for Build"
track-type="nav"
track-metadata-eventdetail="https://firebase.google.com/products-build"
track-metadata-position="nav - build"
track-metadata-module="primary nav"
data-category="Site-Wide Custom Events"
data-label="Tab: Build"
track-name="build"
class="devsite-tabs-dropdown-toggle devsite-icon devsite-icon-arrow-drop-down"></button>
<div class="devsite-tabs-dropdown" role="menu" aria-label="submenu" hidden>
<div class="devsite-tabs-dropdown-content">
<div class="devsite-tabs-dropdown-column
firebase-dropdown firebase-dropdown--primary firebase-build">
<ul class="devsite-tabs-dropdown-section
">
<li class="devsite-nav-title" role="heading" tooltip>Build</li>
<li class="devsite-nav-description">Get to market quickly and securely with products that can scale globally
</li>
<li class="devsite-nav-item">
BTLS Certificate Expiry & Recommendations66 days until leaf cert expires — 3 issues to addressREVIEW
Certificate validity
Recommended actions
- Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
- Enable DNSSEC on your domain for DNS spoofing protection
- Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A+DNS Records1 A records, 23 ms lookupPASS
| A | 216.239.32.29 |
| AAAA | — |
| CNAME | — |
| NS | ns3.google.com, ns1.google.com, ns4.google.com, ns2.google.com |
| MX | 0 smtp.google.com |
| TXT | SPF v=spf1 include:_spf.google.com ~all |
| CAA | Lookup not available with standard resolver |
Multiple A records provide failover if one server goes down.
Single A record means a single point of failure — if that IP goes down, your site is unreachable until DNS TTL expires.
Learn more ▾ ▴
Add multiple A records for round-robin failover, or use a managed DNS provider with health-checked failover (Route 53, Cloudflare, NS1). Short TTL (60-300s) lets clients recover faster on outages.
Source: SRE practice / DNS architecture
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.
ARedirect Chain1 redirect(s), 531 ms totalPASS
https://crashlytics.com
72 ms · HTTP/1.1
https://firebase.google.com/products/cra...
459 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://crashlytics.com | 301 | 72 ms | HTTP/1.1 | sffe |
| 2 | https://firebase.google.com/products/cra... | 200 | 459 ms | HTTP/1.1 | Google Frontend |
See the visual redirect chain in the HTTP Probe tab →
A+URL Variantswww/non-www, trailing slash, HTTP→HTTPSPASS
www / non-www
Preferred variant: non-www
HTTP → HTTPS
Consistent
A+Domain Intelligencecrashlytics.com — via MarkMonitor Inc., 15 years, 5 months old, hosted on Google CloudPASS
220 days
January 21, 2027
66 days
Issued by Google Trust Services
15 years, 5 months
Registered January 21, 2011
Not enabled
Protects against DNS spoofing
Google Cloud
ASN AS15169
216.239.32.29
MarkMonitor Inc.
Expiry timeline
Recommended actions
- Enable DNSSEC to protect visitors from DNS spoofing
- Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
Without DNSSEC, an attacker who can poison your DNS can hijack your domain — and SSL certs alone don't stop them.
Learn more ▾ ▴
DNSSEC adds cryptographic signatures to DNS records, preventing forged responses from poisoning resolver caches. Without it, an attacker who controls the network path can redirect your domain to a malicious server before any HTTPS handshake happens. Most modern registrars (Cloudflare, Google Domains, Route 53) enable it with one toggle.
Source: ICANN / RFC 4033
The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.
Without registrar lock, an attacker who phishes your registrar credentials can transfer the domain in minutes — total brand hijack.
Learn more ▾ ▴
Registrar lock (clientTransferProhibited, clientUpdateProhibited, clientDeleteProhibited) requires extra verification before any transfer/update/delete. Every major registrar offers it free. Combined with 2FA on your registrar account, it's the strongest defense against domain hijacking.
Source: ICANN / domain-security best practice