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https://si.edu

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
83
GRADE
B
FIX
1
REVIEW
4
PASS
4
INFO
0
Probed from Madrid, Spain
301 Moved Permanently
Checks
9
4 PASS 4 REVIEW 1 FIX
D
CDN & Delivery
Action
No CDN detected
FIX
No CDN detected
Warning::
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.

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

B
Crawlability
robots.txt present, no sitemap
REVIEW
robots.txt present, no sitemap
Info::
robots.txt is present
Got: 3823 bytes
Info::
No sitemap.xml found
A sitemap helps search engines discover and index your pages more efficiently.
Info::
robots.txt does not reference a sitemap
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

A sitemap helps search engines discover and index your pages more efficiently.

Why this matters

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

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 3823 B Sitemaps referenced 0 User-agents Amazonbot, CCBot, CloudflareBrowserRenderingCrawler, Google-Extended, GPTBot, meta-externalagent, *, Applebot-Extended, Bytespider, ClaudeBot Blocking No — crawling allowed
# As a condition of accessing this website, you agree to abide by the following
# content signals:

# (a)  If a Content-Signal = yes, you may collect content for the corresponding
#      use.
# (b)  If a Content-Signal = no, you may not collect content for the
#      corresponding use.
# (c)  If the website operator does not include a Content-Signal for a
#      corresponding use, the website operator neither grants nor restricts
#      permission via Content-Signal with respect to the corresponding use.

# The content signals and their meanings are:

# search:   building a search index and providing search results (e.g., returning
#           hyperlinks and short excerpts from your website's contents). Search does not
#           include providing AI-generated search summaries.
# ai-input: inputting content into one or more AI models (e.g., retrieval
#           augmented generation, grounding, or other real-time taking of content for
#           generative AI search answers).
# ai-train: training or fine-tuning AI models.

# ANY RESTRICTIONS EXPRESSED VIA CONTENT SIGNALS ARE EXPRESS RESERVATIONS OF
# RIGHTS UNDER ARTICLE 4 OF THE EUROPEAN UNION DIRECTIVE 2019/790 ON COPYRIGHT
# AND RELATED RIGHTS IN THE DIGITAL SINGLE MARKET.

# BEGIN Cloudflare Managed content

User-agent: *
Content-Signal: search=yes,ai-train=no
Allow: /

User-agent: Amazonbot
Disallow: /

User-agent: Applebot-Extended
Disallow: /

User-agent: Bytespider
Disallow: /

User-agent: CCBot
Disallow: /

User-agent: ClaudeBot
Disallow: /

User-agent: CloudflareBrowserRenderingCrawler
Disallow: /

User-agent: Google-Extended
Disallow: /

User-agent: GPTBot
Disallow: /

User-agent: meta-externalagent
Disallow: /

# END Cloudflare Managed Content

#
# 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
# Disallow security/CDN challenge paths
Disallow: /TSPD/


sitemap.xml No sitemap found

No sitemap found

Adding a sitemap helps search engines discover your pages.

B
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
REVIEW
www/non-www, trailing slash, HTTP→HTTPS
Critical::
Both www and non-www versions serve content
Got: Both variants return 200 Expected: One variant 301-redirects to the other
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.si.edu/
200https://si.edu/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://si.edu/ https://www.si.edu/

Consistent

B
TLS Certificate Expiry & Recommendations
143 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

143
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
A+
DNS Records
1 A records, 91 ms lookup
PASS
1 A records, 91 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 160.111.244.22
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
No IPv6 (AAAA) records
Info::
6 nameserver(s) configured
Got: a26-66.akam.net, a28-65.akam.net, a24-67.akam.net, a11-67.akam.net, a1-88.akam.net, a9-64.akam.net
Info::
1 mail exchanger(s) configured
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
SPF record present in TXT
Info::
DNS resolution time: 91 ms
Got: 91 ms
A160.111.244.22
AAAA
CNAME
NSa26-66.akam.net, a28-65.akam.net, a24-67.akam.net, a11-67.akam.net, a1-88.akam.net, a9-64.akam.net
MX
0 si-edu.mail.protection.outlook.com
TXT
18aa19c7c343e9bdc9c2a6bb9cda5dabb4355c68d8e5932ccd6381651e126505
pardot1004652=926ad95006c2c225fb35c6cf36285e8b112f6756b832538f471e4cbf886f11c0
google-site-verification=9-OyClmReEWU6t3ri7R65zaHcE5ONk80xgeIHMjgg08
9d9f681dca718bea2c480bb46cd0c1ecca4329b3f9e21616bc836d45916defc9
99150e590fc6c7a503eddbc238c57319e437e396766bafb797c36d78f4fc3fe1
canva-site-verification=_s6Cq2oLPbhyDq31iu-b-A
docusign=1c9206b6-fcd1-4754-8bb5-dc9f864d2d2e
1209cfa51bcf735615577b69ddaddc125e40063092c69453ef8b2c90e9db5aa1
atlassian-domain-verification=WsqpJRrIShm2l9mzMRIOQjdSiHChgFqqfOMIUH4B3EDLiaodZL...
494983b036c42cf817dacb5fc919f629c3786991041ddc257fc4014ce1c7886b
jamf-site-verification=_2xGbG2MJiUanzZxmwyiBA
faeacb31d37c71bd733abb60f275e2b68b82f977fa17f48f377fd0824dfea1d1
520551a893da3ebec689738534dcc320a2265c162236dbde97b39a026cd87fb6
085b91e4eb1a7a8572dcf79376104572dd8caf625df8797c2459f62dbd6f8757
7ad39b33bb809dff48ffc936a730927bc47c1b0ce9ef0e5956ffcd3707c7207e
google-site-verification=kanYvoMvgHV_OzXszl4r6hoaRhJ-RSmcKHmMNYbJLM0
asv=84f6dfbd71d6cbaaa0ed4810076c50f6
MS=ms11507808
SPF v=spf1 ip4:160.111.0.0/16 ip4:67.231.156.100 ip4:67.231.148.101 include:spf1.si....
82bfa18d46385ec9599afca5ae30e6f718c8383c062699c76e894b62e9df8e79
14cdba3c0c616a8ce86008cf5436804e406cdff63a73d44cdb943331fe716c5d
103981a55790ab5e79fa42a3be5ec1f1af9688531c1d7201da7b423e1a9afe98
082b9cc317ff878149172c86c461af33b77e375cf70a4eea971a25418ef906d5
D9Pafp4mPMV7Vt+wH+GSYi35FnsBm9zZQA6TLxStwyHV3JFiCPPQGVSJM7UzuvWz/KrphLEsXbc/bs5v...
d2c638e312f5d2bf17a1c5295c39c1b51200c5caff4fafe25ac4f7345d4825aa
0aaea9bca148850c1b6f223e7f57a777232e5a319343f6d8989514c236f298fa
docusign=13c4cb8d-4a47-4283-811e-e667bdd84098
6dee22b4868a2c91e999fd11037713c59d89df90570f080386c6719737c39527
2fa42e7886b78a66bd2e4010268ee32d674f9966c27c327bece432e50daa5ef4
v=spf2.0/pra ?all
b3885056fb9ee4649ca08b2d7f5aee42ad8524f090e1d4bc1ebf388f41695af4
39433829e8c04de67882088be1ceb6eb7300dd8d405217affb631c652d2c92bd
f27120e7e7d9fde4b8b1d550a8676808f32423c68f65bf080257153124065865
adobe-idp-site-verification=ebf44aa1f4d5c71b36a262511b68415832b6f2ad1b7411c52880...
04a376ab7769590c9661fc0941631e28f4055d41005260b40fff3c87d8df9869
4aa7b65339612a9a90d4cebadbb570d0ea68be025de69c1f11a1a14207cfdedb
ae526ed1432cc584889cd7864aeb421535f15c4446220a7fef0084779b769e72
d0979ba3450a12a765a08ae0190e39832ff0175cade82a341307a3291532e19d
7d4550321c0161253c3ea5ccec6c837f8bcf7be735038aa9f653a72d98eec4bc
e85d3013c9c7b3189294607235b7649ecb79aca52fea7d56cd63f8ff0bdd3759
ae4702faaef4287671c09ea00d6ee406f27390cef064da2f1ea20268e56d92c2
f625192959685de445110b63c95ea6f12e17d96e36e9c3e9e0a938c30a4f43ba
Foxit-domain-verification=90c4cab4414ce9a2004043298dd584ce
f32a1ad19f5e57b68f5bba3bcac88ad61fd110d2eefe9cc12cc05c8bbecf5031
google-site-verification=h1dnhf4Bz-gK562okiF7P9C6hy5xTOc_7v-4ChAOpHo
8b581bbbb2fffb6a643e039a6eac27e87f1fb3cc77a63dbf46a1945364b84f1f
3e449f3017316ed138f1d4a6d4be9346a440a6100bb1f1e749992ae4430a7e74
f0afb2e46e0da6455ff974d8d351d6ed3a5520b5fa607284d71e8624f07608a0
atlassian-domain-verification=/lJYot74zjF1VwfCEfyelSmp2V3z5QnHGSWtBhaZzLjy3KajAZ...
b81949f9493326bea1ceae862c879b1a6688f02762ade1c2211702ebb1d5af05
31802817b6579c3d802ca2f1680d394b657eb4788178951026ace15baafb5588
97bf4b9ed60aea1d02f2aeaafc4a2941a8a5c647a0792a8165ea444a7cc34ca7
pardot980712=40b77e6a8c3cb064ca443f8d3483406a462ed6e8096c597515102540924fa4ed
airtable-verification=3f1db8793cf1be25596af7e99e060d41
060016681f61e250780cb31c60e8e9c59232b1a6a96c84f4e6df6241169a80d2
4f91259469ca9960db5699179cb910796852693ba7df70b60545f79373c5d0e2
apple-domain-verification=OQGHn6kF8gOnAiWs
02903de83f211f7c1c93dbbfaf24f4de1222fb631d64214c20f5aa76f0cbb2b1
270f64f6d25ce95f3dee98221993750128f27e3c77866485b5a589f4d00ec863
onetrust-domain-verification=733d52d8e41444d097693c749e597ec9
b5619ec13807b9baa5d942538745a66b67dbf3c844edbd82f227cbf539fecd83
69590cb29bef8c8cc7c9b2e65dc042877bf1f8d8ad89d454339a554f4a6657bf
a37dc5ea443ef274ee1bbf4d014c312e4a36bf28c28204b033f914f932bd45dc
CAALookup not available with standard resolver
Resolved in 91 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.

A
Redirect Chain
1 redirect(s), 409 ms total
PASS
1 redirect(s), 409 ms total
Info::
Single redirect
Got: https://si.edu → https://www.si.edu/ (301)
Info::
WWW normalization redirect

https://si.edu

303 ms · HTTP/1.0

301

https://www.si.edu/

106 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://si.edu301303 msHTTP/1.0BigIP
2https://www.si.edu/200106 msHTTP/1.1cloudflare

See the visual redirect chain in the HTTP Probe tab →

A+
Domain Intelligence
si.edu — 34 years, 3 months old, hosted on SMITHSONIAN - Smithsonian Institution, US
PASS
si.edu — 34 years, 3 months old, hosted on SMITHSONIAN - Smithsonian Institution, US
Info::
Domain registered until Jul 31, 2027 (1 years, 3 months remaining)
Info::
Hosting: SMITHSONIAN - Smithsonian Institution, US
Got: AS25829
Domain expiry

410 days

July 31, 2027

SSL certificate

143 days

Issued by Internet2

Domain age

34 years, 3 months

Registered June 19, 1992

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

SMITHSONIAN - Smithsonian Institution, US

ASN AS25829

160.111.244.22

Registrar

Registrar unknown

Lock status unknown 6 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Registrar
Created June 19, 1992 (34 years, 3 months ago)
Expires July 31, 2027 (1 years, 3 months)
Last Updated January 13, 2026
Name Servers a26-66.akam.net, a1-88.akam.net, a24-67.akam.net, a11-67.akam.net, a28-65.akam.net, a9-64.akam.net
Registrant Smithsonian Institution
Hosting
IP Address 160.111.244.22
ASN AS25829 (SMITHSONIAN - Smithsonian Institution, US)
Provider SMITHSONIAN - Smithsonian Institution, US
Data source: whois (1.0s)
A+
HTTP Probe Timing
Total 329 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
28 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
98 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
106 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
329 ms
Total Time Total request time from DNS lookup through full response.
329 ms

Connection waterfall

DNS Lookup 28 ms TCP Connect 98 ms TLS Handshake 106 ms Server Processing 98 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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