Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Probed from Amsterdam, Netherlands

302 Found

Checks

2 PASS 5 REVIEW 1 FIX

CDN & Delivery

Action

No CDN detected

FIX

No CDN detected

A CDN can significantly improve load times for users around the world by caching content at edge nodes closer to them.

No CDN detected

Consider using a CDN to improve global delivery speed and reduce origin load.

Redirect Chain

1 redirect(s), 1027 ms total

REVIEW

1 redirect(s), 1027 ms total

Single redirect

Got: https://darpa.mil → https://www.darpa.mil (302)

WWW normalization redirect

Uses 302 (temporary) redirect

If permanent, use 301 instead.

Got: https://darpa.mil

Redirect overhead: 1027 ms total

Got: 1027 ms

https://darpa.mil

624 ms · HTTP/1.0

302

https://www.darpa.mil

403 ms · HTTP/1.1 FINAL

#	URL	Status	Time	Protocol	Server
1	https://darpa.mil	302	624 ms	HTTP/1.0	BigIP
2	https://www.darpa.mil	200	403 ms	HTTP/1.1	CloudFront

See the visual redirect chain in the HTTP Probe tab →

If permanent, use 301 instead.

Why this matters

302 (Found) is for genuinely temporary redirects — if this redirect is permanent, switch to 301 to preserve SEO equity.

Learn more ▾

Search engines treat 302 as temporary, keeping the original URL indexed and not transferring full link equity to the destination. Use 301 (Moved Permanently) for permanent redirects (HTTP→HTTPS, www-vs-non-www, URL restructures).

Source: Google Search Central

IPv6 Readiness

Action

No IPv6 support

REVIEW

No IPv6 support

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

Crawlability

Action

robots.txt present, sitemap with 0 URLs

REVIEW

robots.txt present, sitemap with 0 URLs

robots.txt is present

Got: 10240 bytes

sitemap.xml is present

sitemap.xml contains invalid XML

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

sitemap.xml is empty — no URLs found

An empty sitemap provides no value. Add <url> entries for your pages.

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" dir="ltr" prefix="og: https://ogp.me/ns#">
  <head>
    <meta charset="utf-8" />
<meta name="description" content="Since 1958, DARPA has held to an enduring mission: To create technological surprise for U.S. national security." />
<link rel="canonical" href="https://www.darpa.mil" />
<link rel="shortlink" href="https://www.darpa.mil" />
<meta property="og:site_name" content="darpa.mil" />
<meta property="og:url" content="https://www.darpa.mil" />
<meta property="og:title" content="Home | DARPA" />
<meta property="og:description" content="Since 1958, DARPA has held to an enduring mission: To create technological surprise for U.S. national security." />
<meta property="og:image" content="https://www.darpa.mil/sites/default/files/gallery/2024-12/og-luke-arm.png" />
<meta property="og:image:url" content="https://www.darpa.mil/sites/default/files/gallery/2024-12/og-luke-arm.png" />
<meta property="og:image:secure_url" content="https://www.darpa.mil/sites/default/files/gallery/2024-12/og-luke-arm.png" />
<meta property="og:image:type" content="image/png" />
<meta name="MobileOptimized" content="width" />
<meta name="HandheldFriendly" content="true" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="icon" href="/themes/custom/darpa_uswds/favicon.ico" type="image/vnd.microsoft.icon" />

    <title>Home | DARPA</title>
    <link rel="stylesheet" media="all" href="/sites/default/files/css/css_dHTSnv6R-NO3oLg2P0KNnvo0vksxN7uJr7DF-SwRgUk.css?delta=0&amp;language=en&amp;theme=darpa_uswds&amp;include=eJxdkFGKBCEMRC8kLeyFpNRMj4saSWLP9p5-G5phcX7fq1RBUoXq6RupYid1iYV8ljlQN3zj5wadpaGWX3IZMhCmvrL6BOGpVFfI3ZAsPK6TcHwtbq8cscY7jghZ0OCcoBZGxUmrEkrULXR66cK1GIXG-aPceARDXLNzJG6l74GOq-vDKUJE79fsNc7TQi6a-CA5vb04cXWNcoF_lGokW8Kwwt0NCHbBeOr7d_9km33MWIs-KTs91aj5CCV3T975P_Nmml4" />
<link rel="stylesheet" media="all" href="/sites/default/files/css/css_5LiDfqPo9pjLoZYsLdmDjEvoQX8D6jZvYMx4D-iR8gw.css?delta=1&amp;language=en&amp;theme=darpa_uswds&amp;include=eJxdkFGKBCEMRC8kLeyFpNRMj4saSWLP9p5-G5phcX7fq1RBUoXq6RupYid1iYV8ljlQN3zj5wadpaGWX3IZMhCmvrL6BOGpVFfI3ZAsPK6TcHwtbq8cscY7jghZ0OCcoBZGxUmrEkrULXR66cK1GIXG-aPceARDXLNzJG6l74GOq-vDKUJE79fsNc7TQi6a-CA5vb04cXWNcoF_lGokW8Kwwt0NCHbBeOr7d_9km33MWIs-KTs91aj5CCV3T975P_Nmml4" />

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The Live Chain encompasses self-aid, buddy-aid, medic care, en-route care during evacuation, and ultimately, surgical intervention.\u003C\/p\u003E\u003Cp\u003EThe aim is to ensure warfighters survive the pre-surgical period despite the increased time between injury and definitive medical care.\u003C\/p\u003E\u003Cp\u003E\u003Ca class=\u0022primary-button-light primary-button-padding\u0022 href=\u0022\/research\/research-spotlights\/live-chain\u0022\u003E\u003Cspan\u003EExplore the Research Spotlight\u003C\/span\u003E\u003C\/a\u003E\u003C\/p\u003E","media":{"type":"image","src":"\/sites\/default\/files\/styles\/top_tabs_content_panel\/public\/gallery\/2025-11\/darpa-spotlight-live-chain-latest-from-darpa-2025.png","caption":null,"credit":"DARPA | Colie Wertz"}},{"title":"Podcast | Ep 92","body":"\u003Ch4 id=\u0022latest\u0022\u003EIt began with a raised hand\u003C\/h4\u003E\u003Cp\u003EBTO Program Manager Lt. Col. Adam Willis, M.D., U.S. Air Force, shares his remarkable journey from a ROTC physics major to a leading innovator in military medicine.\u003C\/p\u003E\u003Cp\u003EHe explains his work on groundbreaking programs like Golden Hour Evacuation (GOLDEVAC) and Making Anatomical Sense of Hemorrhage (MASH), and details his vision for an \u0022ICU in a box\u0022 and autonomous surgical tools that could save countless lives when evacuation to a surgeon isn\u0027t possible.\u003C\/p\u003E\u003Ctable class=\u0022table\u0022 style=\u0022max-width:100%;\u0022\u003E\u003Ctbody\u003E\u003Ctr\u003E\u003Ctd style=\u0022color:#1369B3;font-family:Georgia, serif;font-size:8.0rem;min-width:15%;padding-right:10px;padding-top:-10px;vertical-align:top;\u0022\u003E\u003Cstrong\u003E\u201c\u003C\/strong\u003E\u003C\/td\u003E\u003Ctd style=\u0022vertical-align:top;\u0022\u003E\u003Cp style=\u0022font-family:\u0026apos;Times New Roman\u0026apos;, serif;font-size:1.5rem;line-height:1.2;margin-top:0;\u0022\u003EYou want to be here ... you want to come to DARPA.\u003C\/p\u003E\u003Cp style=\u0022color:#4a4f57;\u0022\u003E\u2013 \u003Cstrong\u003ECol. Geoffrey Ling,\u003C\/strong\u003E as quoted by Dr. Adam Willis on the advice that set him on his path to the agency.\u003C\/p\u003E\u003C\/td\u003E\u003C\/tr\u003E\u003C\/tbody\u003E\u003C\/table\u003E\u003Cp\u003E\u003Ca class=\u0022primary-button-light primary-button-padding\u0022 href=\u0022\/news\/podcast\/cold-call-to-critical-care-92\u0022\u003E\u003Cspan\u003EListen to Ep 92\u003C\/span\u003E\u003C\/a\u003E\u003C\/p\u003E","media":{"type":"image","src":"\/sites\/default\/files\/styles\/top_tabs_content_panel\/public\/gallery\/2025-09\/voices-from-darpa-logo-680.png","caption":null,"credit":null}}]}},"user":{"uid":0,"permissionsHash":"fcfacb994fff54dd83aed985f9ae5de3e88eb7f17ef6c82e100182743bf6ed91"}}</script>
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sitemap.xml 200 OK

Type URL Set URLs 0 entries Valid XML No

URL Variants

Action

www/non-www, trailing slash, HTTP→HTTPS

REVIEW

www/non-www, trailing slash, HTTP→HTTPS

Both www and non-www versions serve content

Got: Both variants return 200 Expected: One variant 301-redirects to the other

HTTP→HTTPS redirect uses 302 instead of 301

Got: 302 temporary redirect Expected: 301 permanent redirect

www / non-www

200https://www.darpa.mil/

200https://darpa.mil/

Inconsistent — duplicate content risk

HTTP → HTTPS

302http://darpa.mil/ → https://darpa.mil/

Use 301 (permanent) instead of 302 (temporary)

TLS Certificate Expiry & Recommendations

153 days until leaf cert expires — 3 issues to address

REVIEW

Certificate validity

153

days left

0d 30d 60d 90d+

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

DNS Records

1 A records, 564 ms lookup

PASS

1 A records, 564 ms lookup

Resolves to 1 IPv4 address(es)

Got: 192.5.18.235

Single A record — no DNS redundancy

Multiple A records provide failover if one server goes down.

No IPv6 (AAAA) records

3 nameserver(s) configured

Got: ns1.darpa.mil, ns2.darpa.mil, ns3.darpa.mil

1 mail exchanger(s) configured

CAA records not checked

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

SPF record present in TXT

DNS resolution is slow (564 ms)

Slow DNS adds latency to every page load. Consider a faster DNS provider.

Got: 564 ms

A	192.5.18.235
AAAA	—
CNAME	—
NS	ns1.darpa.mil, ns2.darpa.mil, ns3.darpa.mil
MX	5 darpagcchigh-mail-onmicrosoft-us.mail.protection.office365.us
TXT	MS=ms13878411 MS=ms52898078 _txw5g8o11vwi2gtd7d3sdlzm4c0zmo5 ZOOM_verify_1iYBEPMCSpWqlIU5OeVUfA knowbe4-site-verification=7456c4801c4ea2ad1f02e54689d38d3d google-site-verification=si7cj6LEMXZ06jCUtMYQvVhmhuMBUtLdCvodKnRigZw adobe-idp-site-verification=95ebbcd9e0cb96c7e64e3b717fb4e82acb13e84170a087d2f4bb... SPF v=spf1 mx ip4:192.5.18.66 ip4:192.5.18.67 ip4:158.63.250.4 ip4:158.63.250.5 ip4:...
CAA	Lookup not available with standard resolver

Resolved in 564 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.

Slow DNS adds latency to every page load. Consider a faster DNS provider.

Why this matters

DNS resolution is slow — anycast DNS providers (Cloudflare, Route 53) typically resolve <50ms globally.

Source: DNS performance benchmarks

HTTP Probe Timing

Total 619 ms — DNS, TCP, TLS, TTFB, content transfer breakdown

PASS

DNS Lookup

279 ms

TCP Connect

83 ms

TLS Handshake

174 ms

Time to First Byte

619 ms

Total Time

619 ms

Connection waterfall

DNS Lookup 279 ms TCP Connect 83 ms TLS Handshake 174 ms Server Processing 83 ms Content Transfer 0 ms

Domain Intelligence

Domain intelligence data not available

INFO

Domain intelligence data not available

RDAP and WHOIS lookup both failed

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.