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https://harvard.edu

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
86
GRADE
B
FIX
1
REVIEW
3
PASS
5
INFO
0
Probed from Sao Paulo, Brazil
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.harvard.edu/
200https://harvard.edu/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://harvard.edu/ → https://harvard.edu/

Consistent

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

Certificate validity

50
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, 12 ms lookup
PASS
1 A records, 12 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 192.0.66.20
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: a11-67.akam.net, a7-65.akam.net, a1-171.akam.net, a10-66.akam.net, a6-66.akam.net, a16-64.akam.net
Info::
2 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: 12 ms
Got: 12 ms
A192.0.66.20
AAAA—
CNAME—
NSa11-67.akam.net, a7-65.akam.net, a1-171.akam.net, a10-66.akam.net, a6-66.akam.net, a16-64.akam.net
MX
100 mx0a-00171101.pphosted.com
100 mx0b-00171101.pphosted.com
TXT
google-site-verification=pWvLuNePLYxAbafZw2a95vnBhvcj12DzM9NulT9ujSY
fastly-domain-delgation-vdnblsdg768nm-21052021
jamf-site-verification=_Bno41ta_Ef2G0krod2Oow
anthropic-domain-verification-dprfjc=K9LyiFV7zLafnNLNO4lFjyaRx
globalsign-domain-verification=5A1F4E0081852ECB9015E837384121AD
globalsign-domain-verification=1DDF777ED1ADF45E5FFAFFAAD6774180
MS=ms35192554
status-page-domain-verification=p83gt91wpxms
globalsign-domain-verification=1C94E0FFAAE95796F597427644D90C03
xIGeuA0e5B1BOjTE4IBO806ziFX9G1m2dVJ8zO7CMkmKwZ6MEkMXC0P7n5SRCGOdS9jbceH/7gKYgD4h...
Peh2GHoW8uiAzwS9tTZKlGBn9cMq6Y+XUFtrqmLtqFh1WvloPkzGczPsZcSdDfin4hZ7QiL9J7SM8yr7...
openai-domain-verification=dv-e8vYSnmmPbWxpNte1iIKgvOO
pardot679353=f93ea3588d69483bf48dbf587511f51d43ddadaae52b8bac6856c8428559a06d
airtable-verification=b25f432db3cbc5bfc481914364b6ce41
globalsign-domain-verification=dcc2e5d0d67efc32044ae679c7cf19e6
adobe-idp-site-verification=66e813947c764d98330002232f383a68df8ad609065abb9482f3...
google-site-verification=xXWxVElKH8ek_eW45CbAqVSMTQgAqLYUNQUrWpOmkrY
google-site-verification=DzhZyP8pu0M1-RFghfTcSN-9poidboYRNdfn2Rf2hCQ
_51a79b140kb1cu9o67nzuefyhhxthv9
pardot962443=9098884472c5cb29a2e20700b41411cb4aa5ebcf340360e71b2cd8464d8864b6
google-site-verification=MmfJS0BjLRgcxrlj8kAyNdToKeAmj0fKb-lPOnd5Pmo
smartsheet-site-validation=jfLh_IkQNJXuKKpTn7RydwiiaAOLy4CR
SPF v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all
ciscocidomainverification=41ce9827e3fbbca9ce75d5dbb5a6bc7b089dc4e239c1b56ba82821...
google-site-verification=NEWpTHNZnWRWN3trkIMeFbuPVG3ExwOXUHlC9aJ2sks
globalsign-domain-verification=B8359DCEFBCF837B95E2F82282E4297A
google-site-verification=xqg8LPF_v_QMEIST789q8xhRDqUEX4_8lQjAvV6YykY
jAykGnWytyLeBseMa8x2/MBve6/yQqana4yrAc1ROoei7uZHUkM2FU0Xx4qI/rm+kOGdImZdoq0fdodg...
pardot_378242_*=8b485d5cd9114869cff8f307da5fa9287434ebec11621d88c07ce97a7fee06e0
brevo-code:30d9f789747b4c124f72dabf24a0a97f
pardot378242=7001579db574e062735763ba81b54da111abc31facf16bbfa653ab6b8a770988
heroku-domain-verification=1qfmzz9vp3kexf4fr5zuliwvpieih2ffz4gexo7tlh4
globalsign-domain-verification=87677a19ae97bfbeec25ff1510a80420
geneious.com:domain-verification=1781B6exIEsRBzJ0KzPtKg
airtable-verification=8b8110e9283dd87d57b3c5f2f5af2db1
atlassian-domain-verification=ASRKBXyOafZgDCRWh1Ylv34hiOSMgAIoNXs8H57rR3aTkuOD5K...
globalsign-domain-verification=9ff12eafbeebb02a0f2b0383aef9d1fa
status-page-domain-verification=b4j4g69th3vv
google-site-verification=DZTZhbBaYJ6AO5j-tHFYBdkwryNywFh2gMUeg3SRDSg
pardot679353=3cc5e124c5020a1e160f01981f45be33a467a1c802711e0e5654184ef56d18c9
atlassian-domain-verification=OYfkFwspEELRW6A32BsDVWgvdz8/pLBxVcq7s/mHLBVGqRQRG5...
anthropic-domain-verification-gy5zhc=zmrGT2kyyc2HlnUn6f0utkQB6
globalsign-domain-verification=C44DEEAC45AB4DC2B5AD0B9B2E5D5803
_cwe6cxmi9tji7gazwtzipl4onpu23nv
google-site-verification=lY-T8NneGQX1RGXeaoBJjSmT_lx3dLRKDq1xY44ZI5w
airtable-verification=a92cef30671587a4f6deb7951c1c3f1a
openai-domain-verification=dv-5z82SztO32q9YBNgFooNBz5v
atlassian-domain-verification=Z8oUd5brL6/RGUMCkxs4U0P/RyhpiNJEIVx9HXJLr3uqEQ1eDm...
CAALookup not available with standard resolver
Resolved in 12 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), 24 ms total
PASS
1 redirect(s), 24 ms total
Info::
Single redirect
Got: https://harvard.edu → https://www.harvard.edu/ (301)
Info::
WWW normalization redirect

https://harvard.edu

12 ms · HTTP/1.1

301

https://www.harvard.edu/

12 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://harvard.edu30112 msHTTP/1.1nginx
2https://www.harvard.edu/20012 msHTTP/1.1nginx

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 5 URLs
PASS
robots.txt present, sitemap with 5 URLs
Info::
robots.txt is present
Got: 748 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 5 entries
Info::
Sitemap index with 5 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 748 B Sitemaps referenced 10 User-agents * Blocking No — crawling allowed
# START YOAST BLOCK
# ---------------------------
User-agent: *
Disallow:

Sitemap: https://www.harvard.edu/sitemap_index.xml
Sitemap: https://www.harvard.edu/president/sitemap_index.xml
Sitemap: https://www.harvard.edu/media-relations/sitemap_index.xml
Sitemap: https://www.harvard.edu/climate-and-sustainability/sitemap_index.xml
Sitemap: https://www.harvard.edu/wellbeing/sitemap_index.xml
Sitemap: https://www.harvard.edu/guidelines/sitemap_index.xml
Sitemap: https://www.harvard.edu/ai/sitemap_index.xml
Sitemap: https://www.harvard.edu/community/sitemap_index.xml
Sitemap: https://legacyofslavery.harvard.edu/sitemap_index.xml
Sitemap: https://www.harvard.edu/federal-lawsuits/sitemap_index.xml
# ---------------------------
# END YOAST BLOCK
sitemap.xml 200 OK
Type Sitemap Index URLs 5 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
harvard.edu — 41 years, 4 months old, hosted on WordPress.com (Automattic)
PASS
harvard.edu — 41 years, 4 months old, hosted on WordPress.com (Automattic)
Info::
Domain registered until Jul 31, 2026 (3 months remaining)
Info::
Hosting: WordPress.com (Automattic)
Got: AS2635
Domain expiry

17 days

July 31, 2026

SSL certificate

50 days

Issued by Let's Encrypt

Domain age

41 years, 4 months

Registered June 27, 1985

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

WordPress.com (Automattic)

ASN AS2635

192.0.66.20

Registrar

Registrar unknown

Lock status unknown 6 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Renew the domain or enable auto-renewal to prevent accidental expiry
Registrar
Created June 27, 1985 (41 years, 4 months ago)
Expires July 31, 2026 (3 months)
Last Updated March 25, 2026
Name Servers a16-64.akam.net, a1-171.akam.net, a10-66.akam.net, a7-65.akam.net, a11-67.akam.net, a6-66.akam.net
Registrant Harvard University
Hosting
IP Address 192.0.66.20
ASN AS2635 (AUTOMATTIC - Automattic, Inc, US)
Provider WordPress.com (Automattic)
Data source: whois (1.1s)
A+
HTTP Probe Timing
Total 11 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
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.
1 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
4 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
12 ms
Total Time Total request time from DNS lookup through full response.
12 ms

Connection waterfall

DNS Lookup 4 ms TCP Connect 1 ms TLS Handshake 4 ms Server Processing 2 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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