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https://duke.edu

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
80
GRADE
B
FIX
2
REVIEW
3
PASS
4
INFO
0
Probed from Madrid, Spain
302 Found
Checks
9
4 PASS 3 REVIEW 2 FIX
D
TLS Certificate Expiry & Recommendations
Action
7 days until leaf cert expires — 4 issues to address
FIX

Certificate validity

7
days left
0d 30d 60d 90d+
Renew urgently — under 14 days remaining

Recommended actions

  • Renew certificate — 7 days remaining
  • 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
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.

B
Redirect Chain
1 redirect(s), 1243 ms total
REVIEW
1 redirect(s), 1243 ms total
Info::
Single redirect
Got: https://duke.edu → https://www.duke.edu/ (302)
Info::
WWW normalization redirect
Info::
Uses 302 (temporary) redirect
If permanent, use 301 instead.
Got: https://duke.edu
Warning::
Redirect overhead: 1243 ms total
Got: 1243 ms

https://duke.edu

344 ms · HTTP/1.1

302

https://www.duke.edu/

899 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://duke.edu302344 msHTTP/1.1Apache
2https://www.duke.edu/200899 msHTTP/1.1Apache

See the visual redirect chain in the HTTP Probe tab →

If permanent, use 301 instead.

Why this matters

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

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

C
URL Variants
Action
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
Warning::
HTTP→HTTPS redirect uses 302 instead of 301
Got: 302 temporary redirect Expected: 301 permanent redirect

www / non-www

200https://www.duke.edu/
200https://duke.edu/

Inconsistent — duplicate content risk

HTTP → HTTPS

302http://duke.edu/ → https://duke.edu/

Use 301 (permanent) instead of 302 (temporary)

A
DNS Records
2 A records, 441 ms lookup
PASS
2 A records, 441 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 152.3.70.87, 152.3.72.243
Info::
No IPv6 (AAAA) records
Info::
3 nameserver(s) configured
Got: dns-auth-02.oit.duke.edu, dns-nc1-01.oit.duke.edu, dns-auth-01.oit.duke.edu
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
Warning::
DNS resolution is slow (441 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 441 ms
A152.3.70.87, 152.3.72.243
AAAA—
CNAME—
NSdns-auth-02.oit.duke.edu, dns-nc1-01.oit.duke.edu, dns-auth-01.oit.duke.edu
MX
10 duke-edu.mail.protection.outlook.com
TXT
adobe-idp-site-verification=76438831-136f-42eb-8467-627bcd13bec6
airtable-verification=7d15715bf3281d4f6ab41a64ff551dd6
webexdomainverification.DW7A=3d54276f-7c3e-4b36-82cb-f9283bd66232
88n3v2rofr6e5as8nu1tfnq6mg
e2ma-verification=sqqfb
google-site-verification=VxNOqXRiTfBZEja2TbHMcwM3i0FcGUitTMxTa9CdXAg
e2ma-verification=rhq
atlassian-sending-domain-verification=3e62be3c-15a0-4c29-b220-9228dccda4d6
iContact1673295
e2ma-verification=chxfb
e2ma-verification=0dhfb
atlassian-domain-verification=JNWA1j8qak7X8iJmucR4XqAsQOwMPSakfcNzpTn0Jc7b8aFxXc...
iContact1560489
e2ma-verification=984fb
iContact1053803
e2ma-verification=tqqfb
webexdomainverification.DW7B=b34c0222-460e-4621-bb5b-7ce6ee15ead2
e2ma-verification=fbqeb
VqIKTw/sDnE4e+9lXPalJqYaTtomECjG0+6XKvd2Nhfkaw8aAfgvcZjlAshHEjspbTHBtw4hhkk5X1IT...
facebook-domain-verification=z3gz759ai6md22t5oavjekfy06n11r
airtable-verification=979478a7fc8cd2102187835add26f443
e2ma-verification=khq
e2ma-verification=fu4
e2ma-verification=wc0fb
MS=ms29427067
e2ma-verification=qqqfb
google-site-verification=WyhytImncSxgmBWxa1o1_nGcNS2LuzeYvzApLAE2qVA
SPF v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all
iContact1788229
91TR4AEZ87EVJCSEOKTFQJ1KGWHDG7PQ4T52XL7YQ
1password-site-verification=Y3VALDXXNFEVBGZLI56XBT6MKY
iContact1567195
e2ma-verification=vsg
airtable-verification=776ba9943f279be2814d0f5b7bf99b5c
adobe-sign-verification=8c1cf31e238f6042bd9a6e8424ecd7af
ciscocidomainverification=2d1dd96a4eb257ed827359fa052171ab2c46910868187a2bc9365f...
amazonses:kvjwShx2VuYQZKM31gjyJ9z5IWLmFmkF2BSfMHV5j2I=
google-site-verification=VTUhJp3AMqjMfqUIY6tdlBsNKZLr-E_D0oN0Z96EW_E
e2ma-verification=jv3cb
e2ma-verification=e8qeb
google-site-verification=fohuGSMCupMBfLvJ-OqvhaNOUrd4-VJzOA_hUjfM0GQ
yahoo-verification-key=m1mvmfsoVrobVlqVWZx2Cp3YBfQa4w4jqe7f1pXZsdg=
d365mktkey=DVSS3DGKRQNGACvj4bqW577P8t7hrVqGDWyDQzJFAtwx
google-site-verification=Cx538Bo1iba_0Qw1ca-yfo2f0E50HuiB5AzF1oasBOc
e2ma-verification=yq0fb
e2ma-verification=ru6fb
e2ma-verification=spmfb
iContact1742283
google-site-verification=5TXsU4v41p3-uJbMWepQdYbg8ydDm7pZqZpyL43nBec
d365mktkey=9UxytuxfXT7fQ5X2Wqo5UgHrC9MfXzESiUXsydjgVbkx
asv=f0db2381d25189259bae9b4f5b96470a
CAALookup not available with standard resolver
Resolved in 441 ms

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.

Slow DNS adds latency to every page load. Consider a faster DNS provider.

Why this matters

DNS resolution is slow — anycast DNS providers (Cloudflare, Route 53) typically resolve <50ms globally.

Source: DNS performance benchmarks

A+
Crawlability
robots.txt present, sitemap with 2 URLs
PASS
robots.txt present, sitemap with 2 URLs
Info::
robots.txt is present
Got: 170 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 2 entries
Info::
Sitemap index with 2 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 170 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
# START YOAST BLOCK
# ---------------------------
User-agent: *
Disallow:

Sitemap: https://www.duke.edu/sitemap_index.xml
# ---------------------------
# END YOAST BLOCK
sitemap.xml 200 OK
Type Sitemap Index URLs 2 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
duke.edu — 40 years, 5 months old, hosted on DUKE-INTERCHANGE - Duke University, US
PASS
duke.edu — 40 years, 5 months old, hosted on DUKE-INTERCHANGE - Duke University, US
Info::
Domain registered until Jul 31, 2027 (1 years, 3 months remaining)
Info::
Hosting: DUKE-INTERCHANGE - Duke University, US
Got: AS13371
Domain expiry

381 days

July 31, 2027

SSL certificate

7 days

Issued by Internet2

Domain age

40 years, 5 months

Registered June 2, 1986

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

DUKE-INTERCHANGE - Duke University, US

ASN AS13371

152.3.72.243

Registrar

Registrar unknown

Lock status unknown 3 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Renew the TLS certificate or verify auto-renewal is working
Registrar
Created June 2, 1986 (40 years, 5 months ago)
Expires July 31, 2027 (1 years, 3 months)
Last Updated September 11, 2024
Name Servers dns-nc1-01.oit.duke.edu, dns-auth-01.oit.duke.edu, dns-auth-02.oit.duke.edu
Registrant Duke University
Hosting
IP Address 152.3.72.243
ASN AS13371 (DUKE-INTERCHANGE - Duke University, US)
Provider DUKE-INTERCHANGE - Duke University, US
Data source: whois (1.1s)
A
HTTP Probe Timing
Total 480 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
128 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
114 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
123 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
480 ms
Total Time Total request time from DNS lookup through full response.
480 ms

Connection waterfall

DNS Lookup 128 ms TCP Connect 114 ms TLS Handshake 123 ms Server Processing 114 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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