Skip to content
https://nationalacademies.org

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
85
GRADE
B
FIX
1
REVIEW
3
PASS
5
INFO
0
Probed from Santa Clara, United States
301 Moved Permanently
Checks
9
5 PASS 3 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
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.nationalacademies.org/
200https://nationalacademies.org/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://nationalacademies.org/ → https://nationalacademies.org/

Consistent

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

Certificate validity

173
days left
0d 30d 60d 90d+

Recommended actions

  • Prefer TLS 1.3 — TLS 1.2 is acceptable but TLS 1.3 removes RSA key exchange and improves latency
  • Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A+
DNS Records
1 A records, 18 ms lookup
PASS
1 A records, 18 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 144.171.1.16
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: a1-44.akam.net, a5-65.akam.net, a6-66.akam.net, a11-64.akam.net, a16-67.akam.net, a28-67.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: 18 ms
Got: 18 ms
A144.171.1.16
AAAA—
CNAME—
NSa1-44.akam.net, a5-65.akam.net, a6-66.akam.net, a11-64.akam.net, a16-67.akam.net, a28-67.akam.net
MX
10 nas-edu.mail.protection.outlook.com
TXT
MS=ms34821908
MS=ms46445049
0dfgbd9gccd436ntmxtgjftjkylrbx2b
2k21m18pt835k3xhpbscl75qyn3n2c0y
333e69769d3c40df9430574c920fe360
_vqu0g50l4ocz3so0yuziml5yzv6mo0u
nxj2yfj8898pvgbv8pq938pf48dk43zq
w3xnqqk33cz8wkmf36ms662x9hs73qr0
ylcw299yp8f3917dynkv1qkyr2c4k8nk
mandrill_verify.PAOzPVpO5KAb_7WePZebSQ
mandrill_verify.wAm47ZJdVGKprDi-iZkOxQ
google-site-verification=ARj1MldYEfQxsA2EDn8Lt-EkHIYFZ-5KC8RqidR2rzs
SPF v=spf1 mx ip4:77.32.186.167 ip4:204.141.43.101 include:sendgrid.net include:serv...
CAALookup not available with standard resolver
Resolved in 18 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), 591 ms total
PASS
1 redirect(s), 591 ms total
Info::
Single redirect
Got: https://nationalacademies.org → https://www.nationalacademies.org/ (301)
Info::
WWW normalization redirect
Info::
Redirect overhead: 591 ms total
Got: 591 ms

https://nationalacademies.org

286 ms · HTTP/1.0

301

https://www.nationalacademies.org/

305 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://nationalacademies.org301286 msHTTP/1.0BigIP
2https://www.nationalacademies.org/200305 msHTTP/1.1

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 6 URLs
PASS
robots.txt present, sitemap with 6 URLs
Info::
robots.txt is present
Got: 46 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 6 entries
Info::
Sitemap index with 6 child sitemaps
Info::
robots.txt does not reference a sitemap
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

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 46 B Sitemaps referenced 0 User-agents * Blocking No — crawling allowed
User-agent: *
Disallow: *?*=*
Crawl-delay: 10
sitemap.xml 200 OK
Type Sitemap Index URLs 6 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
nationalacademies.org — via Network Solutions, LLC, 27 years, 7 months old, hosted on NAS-AS - National Academy of Sciences, US
PASS
nationalacademies.org — via Network Solutions, LLC, 27 years, 7 months old, hosted on NAS-AS - National Academy of Sciences, US
Info::
Domain registered until Jan 29, 2027 (9 months remaining)
Info::
DNSSEC is enabled
Info::
Registrar: Network Solutions, LLC
Warning::
Registrar lock is NOT enabled
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.
Info::
Hosting: NAS-AS - National Academy of Sciences, US
Got: AS7301
Domain expiry

227 days

January 29, 2027

SSL certificate

173 days

Issued by DigiCert Inc

Domain age

27 years, 7 months

Registered January 29, 1999

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

NAS-AS - National Academy of Sciences, US

ASN AS7301

144.171.1.16

Registrar

Network Solutions, LLC

Unlocked 6 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar Network Solutions, LLC
Created January 29, 1999 (27 years, 7 months ago)
Expires January 29, 2027 (9 months)
Last Updated October 30, 2022
Name Servers a1-44.akam.net, a11-64.akam.net, a16-67.akam.net, a28-67.akam.net, a5-65.akam.net, a6-66.akam.net
DNSSEC Enabled
Hosting
IP Address 144.171.1.16
ASN AS7301 (NAS-AS - National Academy of Sciences, US)
Provider NAS-AS - National Academy of Sciences, US
Data source: rdap (0.2s)

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.

Why this matters

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

A+
HTTP Probe Timing
Total 282 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
10 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
67 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
138 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
283 ms
Total Time Total request time from DNS lookup through full response.
283 ms

Connection waterfall

DNS Lookup 10 ms TCP Connect 67 ms TLS Handshake 138 ms Server Processing 68 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.

Send Feedback