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Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
90
GRADE
A
FIX
1
REVIEW
3
PASS
5
INFO
0
Probed from Singapore, Singapore
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
HTTP Probe Timing
Total 872 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
REVIEW
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
4 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
216 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
437 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
873 ms
Total Time Total request time from DNS lookup through full response.
873 ms

Connection waterfall

DNS Lookup 4 ms TCP Connect 216 ms TLS Handshake 437 ms Server Processing 216 ms Content Transfer 0 ms
B
TLS Certificate Expiry & Recommendations
308 days until leaf cert expires — 4 issues to address
REVIEW

Certificate validity

308
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 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, 4 ms lookup
PASS
1 A records, 4 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 129.176.1.88
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
No IPv6 (AAAA) records
Info::
8 nameserver(s) configured
Got: dns2.mayo.edu, a10-66.akam.net, a18-66.akam.net, a13-66.akam.net, a1-70.akam.net, a3-66.akam.net, dns1.mayo.edu, a14-64.akam.net
Info::
4 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: 4 ms
Got: 4 ms
A129.176.1.88
AAAA—
CNAME—
NSdns2.mayo.edu, a10-66.akam.net, a18-66.akam.net, a13-66.akam.net, a1-70.akam.net, a3-66.akam.net, dns1.mayo.edu, a14-64.akam.net
MX
10 mail5.mayo.edu
10 mail3.mayo.edu
10 mail4.mayo.edu
10 mail2.mayo.edu
TXT
google-site-verification=RTxl6bpOvfdYSWz8OvWzgQBH7z8MU19_g8HIm0_FvmM
SPF v=spf1 mx include:_spf.mayo.edu include:_spf_msgfe_mcmo.mayo.edu -all
google-site-verification=4c_u2Bkm2Ukeurbn5E8KNOMWB8mZ13akrsKP4Pf9MLY
fastly-domain-delegation-b7wfficndvihh4xc7g4z-782253-2024-06-25
ncy863bz54x4hbfx0kxpzms73067ls2p
google-site-verification=ICU8hJAwq3J2ACTSaBwdom6ULZp-485-2jcBAe3MdHY
facebook-domain-verification=hb879ie9x7og44v8xzca5ea8aywdbn
apple-domain-verification=tB6bZOjVnxrGsvNAUCrbvu8w13vf8gisqEuRLcHvBHY
google-site-verification=6vNtdz7ZLqfEYDC2BP1hJKrMY_7QtttXQiTykug1hYA
google-site-verification=JKKcK-DB3LxE-lKs2pZjLfa9o--85ahsbeOwD-LDNdY
google-site-verification=rSQpDFkAgTB3fF4YoIkO1jSJOs7JOlG8CZMzuQJNdxs
google-site-verification=c_nY9XkweOjwanwbo_17mAeu3bcE4YM5ow3YLyr2F_Q
apple-domain-verification=5FmDAtv2LsDzpMQJbHcPQadpnY8p1YJn5I5oM64bP_k
_uz5g1k3wp3my53wj46cfl46g6oxkp54
CAALookup not available with standard resolver
Resolved in 4 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), 904 ms total
PASS
1 redirect(s), 904 ms total
Info::
Single redirect
Got: https://mayoclinic.org → https://www.mayoclinic.org/ (301)
Info::
WWW normalization redirect
Info::
Redirect overhead: 904 ms total
Got: 904 ms

https://mayoclinic.org

861 ms · HTTP/1.0

301

https://www.mayoclinic.org/

43 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://mayoclinic.org301861 msHTTP/1.0BigIP
2https://www.mayoclinic.org/20043 msHTTP/1.1Google Frontend

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 3992 URLs
PASS
robots.txt present, sitemap with 3992 URLs
Info::
robots.txt is present
Got: 2307 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 3992 entries
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 2307 B Sitemaps referenced 32 User-agents * Blocking No — crawling allowed
User-agent: *

Allow:  /


Disallow: /edu/

Disallow: *.model.json

Disallow: /static/chunks/*

Disallow: /api/*


sitemap: https://www.mayoclinic.org/arabic_condition_consolidated_concepts.xml

sitemap: https://www.mayoclinic.org/arabic_organization_concepts.xml

sitemap: https://www.mayoclinic.org/arabic_patient_consumer_faq.xml

sitemap: https://www.mayoclinic.org/arabic_patient_consumer_recipe.xml

sitemap: https://www.mayoclinic.org/arabic_patient_consumer_video.xml

sitemap: https://www.mayoclinic.org/arabic_patient_consumer_web.xml

sitemap: https://www.mayoclinic.org/arabic_procedure_concepts.xml

sitemap: https://www.mayoclinic.org/chinese_condition_consolidated_concepts.xml

sitemap: https://www.mayoclinic.org/chinese_organization_concepts.xml

sitemap: https://www.mayoclinic.org/chinese_patient_consumer_faq.xml

sitemap: https://www.mayoclinic.org/chinese_patient_consumer_recipe.xml

sitemap: https://www.mayoclinic.org/chinese_patient_consumer_video.xml

sitemap: https://www.mayoclinic.org/chinese_patient_consumer_web.xml

sitemap: https://www.mayoclinic.org/chinese_procedure_concepts.xml

sitemap: https://www.mayoclinic.org/condition_consolidated_concepts.xml

sitemap: https://www.mayoclinic.org/london.xml

sitemap: https://www.mayoclinic.org/organization_concepts.xml

sitemap: https://www.mayoclinic.org/patient_consumer_biography.xml

sitemap: https://www.mayoclinic.org/patient_consumer_drug.xml

sitemap: https://www.mayoclinic.org/patient_consumer_faq.xml

sitemap: https://www.mayoclinic.org/patient_consumer_recipe.xml

sitemap: https://www.mayoclinic.org/symptoms_all.xml

sitemap: https://www.mayoclinic.org/patient_consumer_video.xml

sitemap: https://www.mayoclinic.org/patient_consumer_web.xml

sitemap: https://www.mayoclinic.org/procedure_concepts.xml

sitemap: https://www.mayoclinic.org/spanish_condition_consolidated_concepts.xml

sitemap: https://www.mayoclinic.org/spanish_organization_concepts.xml

sitemap: https://www.mayoclinic.org/spanish_patient_consumer_faq.xml

sitemap: https://www.mayoclinic.org/spanish_patient_consumer_recipe.xml

sitemap: https://www.mayoclinic.org/spanish_patient_consumer_video.xml

sitemap: https://www.mayoclinic.org/spanish_patient_consumer_web.xml

sitemap: https://www.mayoclinic.org/spanish_procedure_concepts.xml
sitemap.xml 200 OK
Type URL Set URLs 3992 entries Valid XML Yes
Sample URLs:
A+
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
PASS
www/non-www, trailing slash, HTTP→HTTPS
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

403https://www.mayoclinic.org/
200https://mayoclinic.org/

HTTP → HTTPS

301http://mayoclinic.org/ → https://www.mayoclinic.org/

Consistent

A+
Domain Intelligence
mayoclinic.org — via CSC Corporate Domains, Inc., 29 years, 7 months old, hosted on MAYO - Mayo Foundation for Medical Education and Research, US
PASS
mayoclinic.org — via CSC Corporate Domains, Inc., 29 years, 7 months old, hosted on MAYO - Mayo Foundation for Medical Education and Research, US
Info::
Domain registered until Feb 9, 2028 (1 years, 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: CSC Corporate Domains, Inc.
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: MAYO - Mayo Foundation for Medical Education and Research, US
Got: AS7973
Domain expiry

575 days

February 9, 2028

SSL certificate

308 days

Issued by Sectigo Limited

Domain age

29 years, 7 months

Registered February 8, 1997

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

MAYO - Mayo Foundation for Medical Education and Research, US

ASN AS7973

129.176.1.88

Registrar

CSC Corporate Domains, Inc.

Unlocked 8 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
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar CSC Corporate Domains, Inc.
Created February 8, 1997 (29 years, 7 months ago)
Expires February 9, 2028 (1 years, 10 months)
Last Updated February 10, 2026
Name Servers a1-70.akam.net, a10-66.akam.net, a13-66.akam.net, a14-64.akam.net, a18-66.akam.net, a3-66.akam.net, dns1.mayo.edu, dns2.mayo.edu
DNSSEC Not enabled
Hosting
IP Address 129.176.1.88
ASN AS7973 (MAYO - Mayo Foundation for Medical Education and Research, US)
Provider MAYO - Mayo Foundation for Medical Education and Research, US
Data source: rdap (1.3s)

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

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

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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