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
BHTTP Probe TimingTotal 922 ms — DNS, TCP, TLS, TTFB, content transfer breakdownREVIEW
Connection waterfall
BTLS Certificate Expiry & Recommendations182 days until leaf cert expires — 2 issues to addressREVIEW
Certificate validity
Recommended actions
- Submit your domain to hstspreload.org to be added to the Chrome preload list
- Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
ADNS Records1 A records, 545 ms lookupPASS
| A | 199.16.64.40 |
| AAAA | — |
| CNAME | — |
| NS | auth2.dns.rcn.net, auth3.dns.rcn.net, auth1.dns.rcn.net, auth4.dns.rcn.net |
| MX | 10 nga-gov.mail.protection.outlook.com |
| TXT | T6Twf2l7U+m+Xwdp2M/zUABGkv9llhM1VHjZ2eI48zPgkzo3FrZtWPXh3b1MoE+XqqdZjGlvJCJVGqgw... atlassian-domain-verification=5F6zbXCOyrga1S2FblCsIOFt7rd1eMPxRFXa7WwTT0x01NK47n... SPF v=spf1 include:spf.protection.outlook.com ip4:199.16.64.26 ip4:199.16.64.28 ip4:... adobe-idp-site-verification=e2fd957683f964158cbe69aeb8de16a756d29ba32639e6d287fb... openai-domain-verification=dv-7EO4XWC1NrVMs9qZvQ4aoiEI klaviyo-site-verification=TNYQC3 _globalsign-domain-verification=MXYfuWqs_WgjRVilf9-rprIErAGLPpNekcA2H8Nerj db31746a-ee5c-4b90-be1b-c443ff41946a 3T1V9PTU730NPPLE1USEPU3FDBHBJ5MDKMAVY66DR MS=ms43387121 wrike-verification=MTMzMTc4MDpiZmNmODczMTY4YTNiZTk1ODNjZGY2NTdmZGEyODQ4MDYxMGQ4Z... airtable-verification=f22482db5973a7135b4f5bb0619c2e93 |
| 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.
Slow DNS adds latency to every page load. Consider a faster DNS provider.
DNS resolution is slow — anycast DNS providers (Cloudflare, Route 53) typically resolve <50ms globally.
Source: DNS performance benchmarks
ARedirect Chain1 redirect(s), 564 ms totalPASS
https://nga.gov
397 ms · HTTP/1.1
https://www.nga.gov/
168 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://nga.gov | 302 | 397 ms | HTTP/1.1 | |
| 2 | https://www.nga.gov/ | 403 | 168 ms | HTTP/1.1 | cloudflare |
See the visual redirect chain in the HTTP Probe tab →
If permanent, use 301 instead.
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
ACrawlabilityrobots.txt present, no sitemapPASS
A sitemap helps search engines discover and index your pages more efficiently.
No sitemap.xml — Google relies on crawl-graph discovery alone, slowing indexing of deep or fresh URLs.
Learn more ▾ ▴
A sitemap accelerates Google's discovery of new and updated content. Most CMSes auto-generate one; static-site frameworks need a build-step plugin. Reference it from robots.txt and submit in Search Console to confirm Google can fetch it.
Source: sitemaps.org / Google Search Central
#
# robots.txt
#
# This file is to prevent the crawling and indexing of certain parts
# of your site by web crawlers and spiders run by sites like Yahoo!
# and Google. By telling these "robots" where not to go on your site,
# you save bandwidth and server resources.
#
# This file will be ignored unless it is at the root of your host:
# Used: http://example.com/robots.txt
# Ignored: http://example.com/site/robots.txt
#
# For more information about the robots.txt standard, see:
# http://www.robotstxt.org/robotstxt.html
User-agent: *
# CSS, JS, Images
Allow: /core/*.css$
Allow: /core/*.css?
Allow: /core/*.js$
Allow: /core/*.js?
Allow: /core/*.gif
Allow: /core/*.jpg
Allow: /core/*.jpeg
Allow: /core/*.png
Allow: /core/*.svg
Allow: /profiles/*.css$
Allow: /profiles/*.css?
Allow: /profiles/*.js$
Allow: /profiles/*.js?
Allow: /profiles/*.gif
Allow: /profiles/*.jpg
Allow: /profiles/*.jpeg
Allow: /profiles/*.png
Allow: /profiles/*.svg
# Directories
Disallow: /core/
Disallow: /profiles/
# Files
Disallow: /README.md
Disallow: /composer/Metapackage/README.txt
Disallow: /composer/Plugin/ProjectMessage/README.md
Disallow: /composer/Plugin/Scaffold/README.md
Disallow: /composer/Plugin/VendorHardening/README.txt
Disallow: /composer/Template/README.txt
Disallow: /modules/README.txt
Disallow: /sites/README.txt
Disallow: /themes/README.txt
Disallow: /web.config
# Paths (clean URLs)
Disallow: /admin/
Disallow: /comment/reply/
Disallow: /filter/tips
Disallow: /node/add/
Disallow: /search/
Disallow: /user/register
Disallow: /user/password
Disallow: /user/login
Disallow: /user/logout
Disallow: /media/oembed
Disallow: /*/media/oembed
# Paths (no clean URLs)
Disallow: /index.php/admin/
Disallow: /index.php/comment/reply/
Disallow: /index.php/filter/tips
Disallow: /index.php/node/add/
Disallow: /index.php/search/
Disallow: /index.php/user/password
Disallow: /index.php/user/register
Disallow: /index.php/user/login
Disallow: /index.php/user/logout
Disallow: /index.php/media/oembed
Disallow: /index.php/*/media/oembed
# Pagers and search results pages
Disallow: /search?*
Disallow: /artwork-search?*
Disallow: /artvibes-results/*
Disallow: /calendar?*
Disallow: /educational-resources?*
# In gallery touchscreens
Disallow: /kiosk-presentation/*
Disallow: /kiosk-story/*
Sitemap: https://www.nga.gov/sitemap.xml
No sitemap found
Adding a sitemap helps search engines discover your pages.
AURL Variantswww/non-www, trailing slash, HTTP→HTTPSPASS
www / non-www
HTTP → HTTPS
Use 301 (permanent) instead of 302 (temporary)
A+Domain Intelligencenga.gov — via get.gov, 28 years, 11 months old, hosted on THE-NATIONAL-GALLERY-OF-ART - National Gallery of Art, USPASS
75 days
September 30, 2026
182 days
Issued by DigiCert Inc
28 years, 11 months
Registered October 2, 1997
Enabled
Protects against DNS spoofing
THE-NATIONAL-GALLERY-OF-ART - National Gallery of Art, US
ASN AS54521
199.16.64.40
get.gov
Expiry timeline
Recommended actions
- Renew the domain or enable auto-renewal to prevent accidental expiry
- Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
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