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Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
81
GRADE
B
FIX
0
REVIEW
4
PASS
5
INFO
0
Probed from New York, United Stated
308 Permanent Redirect
Checks
9
5 PASS 4 REVIEW
C
IPv6 Readiness
Action
No IPv6 support
REVIEW
No IPv6 support
Info::
No IPv6 (AAAA) records found
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No IPv6 Support
About 40% of internet users have IPv6. Consider adding AAAA records.

IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.

Why this matters

No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.

Source: Google IPv6 stats

C
Crawlability
Action
robots.txt present, sitemap with 0 URLs
REVIEW
robots.txt present, sitemap with 0 URLs
Info::
robots.txt is present
Got: 10240 bytes
Info::
sitemap.xml is present
Warning::
sitemap.xml contains invalid XML
Search engines may not be able to parse the sitemap. Fix XML validation errors.
Warning::
sitemap.xml is empty — no URLs found
An empty sitemap provides no value. Add <url> entries for your pages.
Info::
robots.txt does not reference a sitemap
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

Search engines may not be able to parse the sitemap. Fix XML validation errors.

Why this matters

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.

Why this matters

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.

Why this matters

robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.

Source: sitemaps.org

robots.txt 200 OK
Size 10240 B Sitemaps referenced 0 User-agents Blocking No — crawling allowed
<!doctype html>
<html lang="en" class="theme-default typo-default">
	<head>
		<meta charset="utf-8" />
		<meta name="viewport" content="width=device-width,initial-scale=1" />
		<meta name="theme-color" content="#ff3e00" />

		<link rel="manifest" href="/manifest.json" />
		<link rel="icon" type="image/png" href="/favicon.png" />

		<meta name="twitter:site" content="@sveltejs" />
		<meta name="twitter:creator" content="@sveltejs" />

		<link
			rel="search"
			type="application/opensearchdescription+xml"
			href="/opensearch.xml"
			title="Svelte"
		/>

		<script>
			document.documentElement.classList.add(
				`font-${localStorage.getItem('svelte:font') ?? 'elegant'}`
			);
		</script>

		<link href="./_app/immutable/assets/eb-garamond-latin-400-normal.DSJrtJSV.woff2" rel="preload" as="font" type="font/woff2" crossorigin>
		<link href="./_app/immutable/assets/dm-serif-display-latin-400-normal.C5_t9oOD.woff2" rel="preload" as="font" type="font/woff2" crossorigin>
		<link href="./_app/immutable/assets/fira-sans-latin-400-normal.a0AnQzuD.woff2" rel="preload" as="font" type="font/woff2" crossorigin>
		<link href="./_app/immutable/entry/start.Ddn2_gng.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/BbUITsMw.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/2d-wjCb2.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/DnTnPfQe.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/gDVcjQvr.js" rel="modulepreload">
		<link href="./_app/immutable/entry/app.BfHSeXOh.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/Shm_I8ZE.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/Dr15X4ZF.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/cnniI1X3.js" rel="modulepreload">
		<link href="./_app/immutable/nodes/0.CPp9tl-V.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/CkfQRXN1.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/DMq8i7cc.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/BKc8iVI8.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/BSRbOYE9.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/Bk_4QwRM.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/B5Zu4Ce9.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/nNp4wHmj.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/DshYxWiH.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/BEYugVbd.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/BI96k1L2.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/sbwG5QcH.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/CcTYJOSJ.js" rel="modulepreload">
		<link href="./_app/immutable/nodes/5.BusgfDGk.js" rel="modulepreload">
		<link href="./_app/immutable/chunks/COynFFGV.js" rel="modulepreload">
		<!--12qhfyh--><!--[--><meta name="twitter:card" content="summary"/> <meta name="twitter:image" content="https://svelte.dev/images/twitter-thumbnail.jpg"/> <meta name="og:image" content="https://svelte.dev/images/twitter-thumbnail.jpg"/><!--]--><!----><!--16r4un1--><script>
		{
			const theme = localStorage.getItem('sv:theme');

			document.documentElement.classList.add(
				!theme || theme === 'system'
					? window.matchMedia('(prefers-color-scheme: dark)').matches
						? 'dark'
						: 'light'
					: theme
			);
		}
	</script><!----><!----><!--16r4un1--><script>
		{
			const theme = localStorage.getItem('sv:theme');

			document.documentElement.classList.add(
				!theme || theme === 'system'
					? window.matchMedia('(prefers-color-scheme: dark)').matches
						? 'dark'
						: 'light'
					: theme
			);
		}
	</script><!----><!----><!--1uha8ag--><meta name="twitter:title" content="Svelte"/> <meta name="twitter:description" content="Web development for the rest of us"/> <meta name="description" content="Web development for the rest of us"/><!----><title>Svelte • Web development for the rest of us</title>
		<style>svg.svelte-hfc14b{vertical-align:middle;-o-object-fit:contain;object-fit:contain;transform-origin:50%;stroke:currentColor;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round;fill:none;position:relative;overflow:hidden}
</style>
		<link href="./_app/immutable/assets/stores.DoLKfBGK.css" rel="stylesheet" disabled media="(max-width: 0)">
		<link href="./_app/immutable/assets/search.Bf59X-yG.css" rel="stylesheet">
		<link href="./_app/immutable/assets/Text.VHKouIL-.css" rel="stylesheet">
		<link href="./_app/immutable/assets/components.CAIh7XZF.css" rel="stylesheet">
		<link href="./_app/immutable/assets/0.qrmhJS98.css" rel="stylesheet">
		<link href="./_app/immutable/assets/5.Bk-u82YL.css" rel="stylesheet">
	</head>
	<body data-sveltekit-preload-data="hover">
		<script>
			{
				const div = document.createElement('div');

				Object.assign(div.style, {
					width: '100px',
					height: '100px',
					overflow: 'scroll',
					position: 'absolute',
					top: '-9999px'
				});

				document.body.append(div);

				document.documentElement.classList.add(
					div.offsetWidth - div.clientWidth > 0 ? 'scrollbars-visible' : 'scrollbars-invisible'
				);

				div.remove();
			}
		</script>

		<div style="height: 100%"><!--[--><!--[--><!--[--><div style="display: none"><svg><symbol id="arrow-left" class="icon" viewBox="0 0 24 24"><line x1="19" y1="12" x2="5" y2="12"></line><polyline points="12 19 5 12 12 5"></polyline></symbol><symbol id="arrow-right" class="icon" viewBox="0 0 24 24"><line x1="5" y1="12" x2="19" y2="12"></line><polyline points="12 5 19 12 12 19"></polyline></symbol><symbol id="arrow-right-chevron" viewBox="0 0 24 24"><path fill="currentColor" d="M8.7 17.3q-.275-.275-.275-.7t.275-.7l3.9-3.9l-3.9-3.9q-.275-.275-.275-.7t.275-.7q.275-.275.7-.275t.7.275l4.6 4.6q.15.15.213.325t.062.375q0 .2-.063.375t-.212.325l-4.6 4.6q-.275.275-.7.275t-.7-.275Z"></path></symbol><symbol id="arrow-up" class="icon" viewBox="0 0 24 24"><line x1="12" y1="19" x2="12" y2="5"></line><polyline points="5 12 12 5 19 12"></polyline></symbol><symbol id="arrow-down" class="icon" viewBox="0 0 24 24"><line x1="12" y1="5" x2="12" y2="19"></line><polyline points="19 12 12 19 5 12"></polyline></symbol><symbol id="check" class="icon" viewBox="0 0 24 24"><polyline points="20 6 9 17 4 12"></polyline></symbol><symbol id="close" class="icon" viewBox="0 0 24 24"><line x1="18" y1="6" x2="6" y2="18"></line><line x1="6" y1="6" x2="18" y2="18"></line></symbol><symbol id="download" class="icon" viewBox="0 0 24 24"><path d="M21 15V19A2 2 0 0 1 19 21H5A2 2 0 0 1 3 19V15"></path><polyline points="7 10 12 15 17 10"></polyline><line x1="12" y1="15" x2="12" y2="3"></line></symbol><symbol id="edit" class="icon" viewBox="0 0 24 24"><path d="M20 14.66V20a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V6a2 2 0 0 1 2-2h5.34"></path><polygon points="18 2 22 6 12 16 8 16 8 12 18 2"></polygon></symbol><symbol id="git-branch" class="icon" viewBox="0 0 24 24"><line x1="6" y1="3" x2="6" y2="15"></line><circle cx="18" cy="6" r="3"></circle><circle cx="6" cy="18" r="3"></circle><path d="M18 9a9 9 0 0 1-9 9"></path></symbol><symbol id="log-in" class="icon" viewBox="0 0 24 24"><path d="M15 3H19A2 2 0 0 1 21 5V19A2 2 0 0 1 19 21H15"></path><polyline points="10 17 15 12 10 7"></polyline><line x1="15" y1="12" x2="3" y2="12"></line></symbol><symbol id="maximize" class="icon" viewBox="0 0 24 24"><path d="M8 3H5a2 2 0 0 0-2 2v3m18 0V5a2 2 0 0 0-2-2h-3m0 18h3a2 2 0 0 0 2-2v-3M3 16v3a2 2 0 0 0 2 2h3"></path></symbol><symbol id="maximize-2" class="icon" viewBox="0 0 24 24"><polyline points="15 3 21 3 21 9"></polyline><polyline points="9 21 3 21 3 15"></polyline><line x1="21" y1="3" x2="14" y2="10"></line><line x1="3" y1="21" x2="10" y2="14"></line></symbol><symbol id="menu" viewBox="0 0 48 48"><path fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="4" d="M7.95 11.95h32m-32 12h32m-32 12h32"></path></symbol><symbol id="message-square" class="icon" viewBox="0 0 24 24"><g transform="translate(0, 1)"><path d="M16.5 19H11V15H18V11H22V19H19.5L18 20.5L16.5 19Z" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"></path><path d="M2 3H18V15H8.5L6.5 17L4.5 15H2V3 M5 10L5 12L10 12L10 10  M5 6L5 9L13 9L13 6Z" fill="currentColor" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"></path></g></symbol><symbol id="minus" class="icon" viewBox="0 0 24 24"><line x1="5" y1="12" x2="19" y2="12"></line></symbol><symbol id="plus" class="icon" viewBox="0 0 24 24"><line x1="12" y1="5" x2="12" y2="19"></line><line x1="5" y1="12" x2="19" y2="12"></line></symbol><symbol id="save" class="icon" viewBox="0 0 24 24"><path d="M19 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h11l5 5v11a2 2 0 0 1-2 2z"></path><polyline points="17 21 17 13 7 13 7 21"></polyline><polyline points="7 3 7 8 15 8"></polyline></symbol><symbol id="link" class="icon" viewBox="0 0 24 24"><path d="M9,7L6,7A2 2 0 0 0 6,17L9,17"></path><path d="M15,7L18,7A2 2 0 0 1 18,17L15,17"></path><path d="M7,12L17,12"></path></symbol><symbol viewBox="0 0 24 24" id="external-link"><path fill="currentColor" stroke-width="0" d="m16 8.4l-8.875 8.9q-.3.3-.713.3t-.712-.3q-.3-.3-.3-.713t.3-.712L14.6 7H7q-.425 0-.713-.288T6 6q0-.425.288-.713T7 5h10q.425 0 .713.288T18 6v10q0 .425-.288.713T17 17q-.425 0-.713-.288T16 16V8.4Z"></path></symbol><symbol id="chevron-up" class="icon" viewBox="0 0 24 24"><polyline points="18 15 12 9 6 15"></polyline></symbol><symbol id="chevron-down" class="icon" viewBox="0 0 24 24"><path d="m6 9 6 6 6-6"></path></symbol><symbol id="delete" class="icon" viewBox="0 0 24 24"><path fill="currentColor" stroke="none" d="M22 4.2h-5.6L15 1.6c-.1-.2-.4-.4-.7-.4H9.6c-.2 0-.5.2-.6.4L7.6 4.2H2c-.4 0-.8.4-.8.8s.4.8.8.8h1.8V22c0 .4.3.8.8.8h15c.4 0 .8-.3.8-.8V5.8H22c.4 0 .8-.3.8-.8s-.4-.8-.8-.8zM10.8 16.5c0 .4-.3.8-.8.8s-.8-.3-.8-.8V10c0-.4.3-.8.8-.8s.8.3.8.8v6.5zm4 0c0 .4-.3.8-.8.8s-.8-.3-.8-.8V10c0-.4.3-.8.8-.8s.8.3.8.8v6.5z"></path></symbol><symbol id="home" viewBox="0 0 256 256"><path fill="currentColor" d="m221.56 100.85l-79.95-75.47l-.16-.15a19.93 19.93 0 0 0-26.91 0l-.17.15l-79.93 75.47a20.07 20.07 0 0 0-6.44 14.7V208a20 20 0 0 0 20 20h48a20 20 0 0 0 20-20v-44h24v44a20 20 0 0 0 20 20h4
sitemap.xml 200 OK
Type URL Set URLs 0 entries Valid XML No
B
TLS Certificate Expiry & Recommendations
68 days until leaf cert expires — 4 issues to address
REVIEW

Certificate validity

68
days left
0d 30d 60d 90d+

Recommended actions

  • Add includeSubDomains to the HSTS directive
  • Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
  • 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
B
CDN & Delivery
Vercel
REVIEW
Vercel
Info::
Site is served via Vercel CDN
Got: x-vercel-id: iad1::p6zlg-1775488082671-2395c1e64dc6
CDN Detected: Vercel
Provider Vercel Evidence x-vercel-id: iad1::p6zlg-1775488082671-2395c1e64dc6
A
DNS Records
1 A records, 71 ms lookup
PASS
1 A records, 71 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 76.76.21.123
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
No IPv6 (AAAA) records
Info::
No NS records found
Info::
No MX records — email not configured via DNS
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
No SPF record found in TXT records
SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.
Info::
DNS resolution time: 71 ms
Got: 71 ms
A76.76.21.123
AAAA—
CNAME—
NS—
MX—
TXT—
CAALookup not available with standard resolver
Resolved in 71 ms

Multiple A records provide failover if one server goes down.

Why this matters

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.

Why this matters

Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.

SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.

Why this matters

Without SPF, receiving servers can't validate sending IPs — your domain is easier to spoof in phishing.

Learn more ▾

SPF complements DMARC. Both should be published. SPF records list authorized sending IPs (e.g., `v=spf1 include:_spf.google.com ~all` for Google Workspace). After publishing, verify in Google Postmaster Tools or mxtoolbox.

Source: RFC 7208 (SPF)

A
Redirect Chain
1 redirect(s), 201 ms total
PASS
1 redirect(s), 201 ms total
Info::
Single redirect
Got: https://kit.svelte.dev → https://svelte.dev/ (308)
Info::
Cross-domain redirect detected

https://kit.svelte.dev

157 ms · HTTP/1.1

308

https://svelte.dev/

45 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://kit.svelte.dev308157 msHTTP/1.1Vercel
2https://svelte.dev/20045 msHTTP/1.1Vercel

See the visual redirect chain in the HTTP Probe tab →

A
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
PASS
www/non-www, trailing slash, HTTP→HTTPS
Warning::
HTTP→HTTPS redirect uses 302 instead of 301
Got: 302 temporary redirect Expected: 301 permanent redirect

www / non-www

https://www.kit.svelte.dev/
200https://kit.svelte.dev/

HTTP → HTTPS

308http://kit.svelte.dev/ → https://kit.svelte.dev/

Use 301 (permanent) instead of 302 (temporary)

A+
Domain Intelligence
svelte.dev — via CloudFlare, Inc., 7 years, 2 months old, hosted on AWS
PASS
svelte.dev — via CloudFlare, Inc., 7 years, 2 months old, hosted on AWS
Info::
Domain registered until Feb 28, 2027 (10 months remaining)
Info::
DNSSEC is not enabled
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
Info::
Registrar: CloudFlare, Inc.
Info::
Hosting: AWS
Got: AS16509
Domain expiry

231 days

February 28, 2027

SSL certificate

68 days

Issued by Let's Encrypt

Domain age

7 years, 2 months

Registered February 28, 2019

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

AWS

ASN AS16509

76.76.21.123

Registrar

CloudFlare, Inc.

Lock status unknown 2 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable DNSSEC to protect visitors from DNS spoofing
Registrar CloudFlare, Inc.
Created February 28, 2019 (7 years, 2 months ago)
Expires February 28, 2027 (10 months)
Last Updated February 3, 2026
Name Servers cody.ns.cloudflare.com, jean.ns.cloudflare.com
DNSSEC Not enabled
Hosting
IP Address 76.76.21.123
ASN AS16509 (AMAZON-02 - Amazon.com, Inc., US)
Provider AWS
Data source: rdap (1.1s)

DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.

Why this matters

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

A+
HTTP Probe Timing
Total 75 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
14 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
2 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
19 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
75 ms
Total Time Total request time from DNS lookup through full response.
75 ms

Connection waterfall

DNS Lookup 14 ms TCP Connect 2 ms TLS Handshake 19 ms Server Processing 41 ms Content Transfer 0 ms
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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