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https://vanderbilt.edu

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
80
GRADE
B
FIX
0
REVIEW
6
PASS
3
INFO
0
Probed from Singapore, Singapore
302 Found
Checks
9
3 PASS 6 REVIEW
B
Redirect Chain
1 redirect(s), 1163 ms total
REVIEW
1 redirect(s), 1163 ms total
Info::
Single redirect
Got: https://vanderbilt.edu → https://www.vanderbilt.edu/ (302)
Info::
WWW normalization redirect
Info::
Uses 302 (temporary) redirect
If permanent, use 301 instead.
Got: https://vanderbilt.edu
Warning::
Redirect overhead: 1163 ms total
Got: 1163 ms

https://vanderbilt.edu

829 ms · HTTP/1.1

302

https://www.vanderbilt.edu/

334 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://vanderbilt.edu302829 msHTTP/1.1CloudFront
2https://www.vanderbilt.edu/200334 msHTTP/1.1AmazonS3

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

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.vanderbilt.edu/
200https://vanderbilt.edu/

Inconsistent — duplicate content risk

HTTP → HTTPS

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

Consistent

B
HTTP Probe Timing
Total 1378 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
REVIEW
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
164 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
407 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
406 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
1.38 s
Total Time Total request time from DNS lookup through full response.
1.38 s

Connection waterfall

DNS Lookup 164 ms TCP Connect 407 ms TLS Handshake 406 ms Server Processing 401 ms Content Transfer 0 ms
B
TLS Certificate Expiry & Recommendations
185 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

185
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
B
CDN & Delivery
AWS CloudFront (FunctionGeneratedResponse from cloudfront)
REVIEW
AWS CloudFront (FunctionGeneratedResponse from cloudfront)
Info::
Site is served via AWS CloudFront CDN (edge: IAD89-P1)
Got: x-amz-cf-id: Ok4FYMwR56ImOjUvySkrLxXIkx6vrNCXW_9St4Eslzjl0H-kve9jiA==
Info::
CDN cache status: FunctionGeneratedResponse from cloudfront
Document served via CDN: AWS CloudFront
Provider AWS CloudFront Cache Status FunctionGeneratedResponse from cloudfront Evidence x-amz-cf-id: Ok4FYMwR56ImOjUvySkrLxXIkx6vrNCXW_9St4Eslzjl0H-kve9jiA==
A
DNS Records
4 A records, 324 ms lookup
PASS
4 A records, 324 ms lookup
Info::
Resolves to 4 IPv4 address(es)
Got: 18.67.65.116, 18.67.65.60, 18.67.65.38, 18.67.65.119
Info::
No IPv6 (AAAA) records
Info::
4 nameserver(s) configured
Got: ns3.vanderbilt.edu, ns2.vanderbilt.edu, ns4.vanderbilt.edu, ns1.vanderbilt.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 (324 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 324 ms
A18.67.65.116, 18.67.65.60, 18.67.65.38, 18.67.65.119
AAAA—
CNAME—
NSns3.vanderbilt.edu, ns2.vanderbilt.edu, ns4.vanderbilt.edu, ns1.vanderbilt.edu
MX
0 vanderbilt-edu.mail.protection.outlook.com
TXT
SPF v=spf1 mx ip4:129.59.16.3 ip4:129.59.16.4 ip4:129.59.16.5 ip4:129.59.15.240 ip4:...
MS=ms22528399
atlassian-domain-verification=KIrgf7/apONq/bRnIYdJbtFpatSYKDRI9zXQMa5facg4/7C7aQ...
google-site-verification=ZPkskV3bBDvSNlfQT4v7iQztoJzSniLVsXVRNUysWTs
infoblox-domain-mastery=f0b5ed4094e6987428819256812c9b4e577e8947244eaa8ac44dfa20...
docusign=3041bd88-1c88-49c0-8576-3d2885cb672b
docusign=529f0db5-6560-4a5a-bd99-efb58047d240
ZOOM_verify_dr4sLjF8sxm6AcjtNNiMB2
_v8vb83d1o4uah31sa6cwz1ahxj5v68w
notion-domain-verification=97dE1bHc7XC2FHSsR7KrzXMFu0GSMKquWBIciXaOXMx
CAALookup not available with standard resolver
Resolved in 324 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
no robots.txt, sitemap with 1 URLs
PASS
no robots.txt, sitemap with 1 URLs
Info::
No robots.txt found
robots.txt is optional but recommended. It tells search engine crawlers which pages to index.
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 1 entries
Info::
Sitemap index with 1 child sitemaps

robots.txt is optional but recommended. It tells search engine crawlers which pages to index.

Why this matters

No robots.txt — crawlers fetch /robots.txt and get 404; not breaking but means default crawl behavior with no directives or sitemap reference.

Learn more ▾

A minimal robots.txt with `User-agent: * / Allow: / / Sitemap: https://example.com/sitemap.xml` covers the basics. Without it, crawlers behave fine but lose the sitemap signal and can't be selectively blocked from crawl-traps.

Source: robotstxt.org

robots.txt No robots.txt found

No robots.txt found

This is fine for most sites — a missing robots.txt allows all crawling by default.

sitemap.xml 200 OK
Type Sitemap Index URLs 1 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
vanderbilt.edu — 39 years, 3 months old, hosted on AWS
PASS
vanderbilt.edu — 39 years, 3 months old, hosted on AWS
Info::
Domain registered until Jul 31, 2027 (1 years, 3 months remaining)
Info::
Hosting: AWS
Got: AS16509
Domain expiry

283 days

July 31, 2027

SSL certificate

185 days

Issued by Amazon

Domain age

39 years, 3 months

Registered July 27, 1987

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

AWS

ASN AS16509

18.67.65.119

Registrar

Registrar unknown

Lock status unknown 4 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Registrar
Created July 27, 1987 (39 years, 3 months ago)
Expires July 31, 2027 (1 years, 3 months)
Last Updated June 6, 2024
Name Servers ns1.vanderbilt.edu, ns4.vanderbilt.edu, ns3.vanderbilt.edu, ns2.vanderbilt.edu
Registrant Vanderbilt University
Hosting
IP Address 18.67.65.119
ASN AS16509 (AMAZON-02 - Amazon.com, Inc., US)
Provider AWS
Data source: whois (1.4s)
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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