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https://clemson.edu

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
88
GRADE
B
FIX
1
REVIEW
4
PASS
4
INFO
0
Probed from Amsterdam, Netherlands
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.

B
Redirect Chain
1 redirect(s), 1797 ms total
REVIEW
1 redirect(s), 1797 ms total
Info::
Single redirect
Got: https://clemson.edu → https://www.clemson.edu/ (301)
Info::
WWW normalization redirect
Warning::
Redirect overhead: 1797 ms total
Got: 1797 ms

https://clemson.edu

767 ms · HTTP/1.0

301

https://www.clemson.edu/

1030 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://clemson.edu301767 msHTTP/1.0BigIP
2https://www.clemson.edu/2001030 msHTTP/1.1Apache/2.4.37 (Oracle Linux Server) OpenSSL/1.1.1k

See the visual redirect chain in the HTTP Probe tab →

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.clemson.edu/
200https://clemson.edu/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://clemson.edu/ → https://www.clemson.edu/

Consistent

B
HTTP Probe Timing
Total 887 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
REVIEW
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
225 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
164 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
334 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
887 ms
Total Time Total request time from DNS lookup through full response.
887 ms

Connection waterfall

DNS Lookup 225 ms TCP Connect 164 ms TLS Handshake 334 ms Server Processing 165 ms Content Transfer 0 ms
B
TLS Certificate Expiry & Recommendations
353 days until leaf cert expires — 4 issues to address
REVIEW

Certificate validity

353
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, 229 ms lookup
PASS
1 A records, 229 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 130.127.204.30
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
Has 1 IPv6 (AAAA) record(s)
Got: 2620:103:a004:36::30
Info::
3 nameserver(s) configured
Got: extns3.clemson.edu, extns1.clemson.edu, extns2.clemson.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 (229 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 229 ms
A130.127.204.30
AAAA2620:103:a004:36::30
CNAME—
NSextns3.clemson.edu, extns1.clemson.edu, extns2.clemson.edu
MX
0 clemson-edu.mail.protection.outlook.com
TXT
873688d59ffa4e0c1fafabdf048935b8.clemson.edu
2a21cb707665c2ed4a7df0127f749f11b7612a771152a395dc0704bc6ada709e
3YKAXO3FY2KWCQAIKRNQ3BWCNQH9QYJSW5MWNYYQJ
e2ma-verification=9mveb
ibmid=e4156f6a-b08e-4838-bbb9-41c0c9125815
smartsheet-site-validation=nsTXLGIWKjChPpP3umKKPI0Tol_ErOlE
status-page-domain-verification=dcgz9nd14fg4
openai-domain-verification=dv-4xC89x3xLbn8GlbLV4Xr5J57
google-site-verification=8QBFHdecJLrDer2g8wB5tHpA9NWYSsg5byDquqZR0IE
apple-domain-verification=JavcMPNMoxgzUjfi
MS=ms25870385
QNrJWkzdvejgfzMzXds5YBtpMDvIL3F2QhYsouk29NlyEhktTx9bCOXH+XEw9Up/is+8f5GwF/1Hzg3L...
poll-everywhere-2-0-domain-verification-gr8gf9=37HwdsovEXRssRprmL0Njj9WE
solarwinds-service0desk-verification=b056c9b8349a500fe2df91069fe1a44e
SPF v=spf1 ip4:130.127.0.0/16 ip4:192.5.219.0/24 include:spf.protection.outlook.com ...
adobe-idp-site-verification=13f1cc18-6ae6-4077-9a4f-d1f20a727eb0
sprout-social-9ee7082b-db69-4d0c-aeec-0693dfe470d9
CAALookup not available with standard resolver
Resolved in 229 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.

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+
IPv6 Readiness
IPv6 reachable (103 ms)
PASS
IPv6 reachable (103 ms)
Info::
IPv6 is configured and reachable at 2620:103:a004:36::30
Got: 103 ms connect
IPv6 Ready
AAAA Records 2620:103:a004:36::30 Connection Reachable (103 ms)
A+
Crawlability
robots.txt present, sitemap with 98 URLs
PASS
robots.txt present, sitemap with 98 URLs
Info::
robots.txt is present
Got: 681 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 98 entries
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 681 B Sitemaps referenced 10 User-agents *, googlebot Blocking No — crawling allowed
User-agent: *

Disallow: *.html/


user-agent: googlebot

Disallow: /_ows_includes/php/

Disallow: /_ows_includes/temp/

Disallow: /*sn-config.html


Sitemap: https://www.clemson.edu/sitemap.xml

Sitemap: https://wwwdev.clemson.edu/business/sitemap.xml

Sitemap: https://www.clemson.edu/caac/sitemap.xml

Sitemap: https://www.clemson.edu/cah/sitemap.xml

Sitemap: https://www.clemson.edu/cbshs/sitemap.xml

Sitemap: https://www.clemson.edu/cecas/sitemap.xml

Sitemap: https://www.clemson.edu/education/sitemap.xml

Sitemap: https://www.clemson.edu/public/sitemap.xml

Sitemap: https://www.clemson.edu/extension/sitemap.xml

Sitemap: https://www.clemson.edu/graduate/sitemap.xml
sitemap.xml 200 OK
Type URL Set URLs 98 entries Valid XML Yes
Sample URLs:
A+
Domain Intelligence
clemson.edu — 39 years, 8 months old
PASS
clemson.edu — 39 years, 8 months old
Info::
Domain registered until Jul 31, 2027 (1 years, 3 months remaining)
Domain expiry

410 days

July 31, 2027

SSL certificate

353 days

Issued by Internet2

Domain age

39 years, 8 months

Registered February 19, 1987

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

Unknown

2620:103:a004:36::30

Registrar

Registrar unknown

Lock status unknown 3 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Registrar
Created February 19, 1987 (39 years, 8 months ago)
Expires July 31, 2027 (1 years, 3 months)
Last Updated November 14, 2025
Name Servers extns3.clemson.edu, extns2.clemson.edu, extns1.clemson.edu
Registrant Clemson University
Hosting
IP Address 2620:103:a004:36::30
Data source: whois (0.7s)
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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