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Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
83
GRADE
B
FIX
1
REVIEW
4
PASS
4
INFO
0
Probed from Sao Paulo, Brazil
200 OK
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.

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
Crawlability
robots.txt present, sitemap with 37408 URLs
REVIEW
robots.txt present, sitemap with 37408 URLs
Info::
robots.txt is present
Got: 2855 bytes
Info::
sitemap.xml is present
Warning::
sitemap.xml contains invalid XML
Search engines may not be able to parse the sitemap. Fix XML validation errors.
Info::
sitemap.xml contains 37408 entries
Info::
robots.txt references sitemap

Search engines may not be able to parse the sitemap. Fix XML validation errors.

Why this matters

An unparseable sitemap is silently ignored by Google — the URLs it advertises are never queued for crawl.

Learn more ▾

Google's sitemap parser is strict about XML validity. A single unescaped `&` or unclosed tag invalidates the whole file. Run your sitemap through a validator (Search Console's Sitemaps report flags it) and fix the offending entry. Most generators escape correctly; mistakes usually come from manually-written entries.

Source: sitemaps.org / Google Search Central

robots.txt 200 OK
Size 2855 B Sitemaps referenced 2 User-agents * Blocking No — crawling allowed
User-agent: *
Crawl-delay: 3
Disallow: /~
Disallow: /pmm-templates/

#
# Discovery Park
#
#   Updated by Jakob Knigga (jknigga) 9/21/2017
#
Disallow: /discoverypark/bdmce/events/
Disallow: /discoverypark/bdmce/news/
Disallow: /discoverypark/bioscience/events/
Disallow: /discoverypark/bioscience/news/
Disallow: /discoverypark/birck/events/
Disallow: /discoverypark/birck/news/
Disallow: /discoverypark/c3bio/events/
Disallow: /discoverypark/c3bio/news/
Disallow: /discoverypark/caid/events/
Disallow: /discoverypark/caid/news/
Disallow: /discoverypark/climate/events/
Disallow: /discoverypark/climate/news/
Disallow: /discoverypark/drug-discovery/events/
Disallow: /discoverypark/drug-discovery/news/
Disallow: /discoverypark/energy/events/
Disallow: /discoverypark/energy/news/
Disallow: /discoverypark/environment/events/
Disallow: /discoverypark/environment/news/
Disallow: /discoverypark/food/events/
Disallow: /discoverypark/food/news/
Disallow: /discoverypark/igsdi/events/
Disallow: /discoverypark/igsdi/news/
Disallow: /discoverypark/nextrans/events/
Disallow: /discoverypark/nextrans/news/
Disallow: /discoverypark/pillars/integrative-neuroscience-center/events/
Disallow: /discoverypark/pillars/integrative-neuroscience-center/news/
Disallow: /discoverypark/pillars/pi4d/events/
Disallow: /discoverypark/pillars/pi4d/news/
Disallow: /discoverypark/ppri/events/
Disallow: /discoverypark/ppri/news/
Disallow: /discoverypark/rche/events/
Disallow: /discoverypark/rche/news/
Disallow: /discoverypark/vaccine/events/
Disallow: /discoverypark/vaccine/news/
Disallow: /discoverypark/wghi/events/
Disallow: /discoverypark/wghi/news/

#
# Gradschool
#
Disallow: /gradschool/gsdb/

#
# HHS
#
#    Updated by Lisa Stein 1/27/2017 - FP 764035
#
Disallow: /hhs/hdfs/r28j51xz/

#
# Vet
#
#    Updated by Osmar Lopez 5/29/2019 - FP 1114881
#
Disallow: /vet/application
Disallow: /vet/badges
Disallow: /vet/blocks
Disallow: /vet/building-directory
Disallow: /vet/campaign-emails
Disallow: /vet/courses
Disallow: /vet/ctr/files/documents/CTR-Research-Information.pdf
Disallow: /vet/ctr/files/documents/CTR-Translational-Research.pdf
Disallow: /vet/dvm/admissions/files/Insiders Guide.pdf
Disallow: /vet/dvmconnect
Disallow: /vet/epubs
Disallow: /vet/files/includes
Disallow: /vet/fileshare
Disallow: /vet/intranet
Disallow: /vet/pcop/videos
Disallow: /vet/scheduler
Disallow: /vet/secure
Disallow: /vet/sharepoint
Disallow: /vet/supportpvm
Disallow: /vet/sureshmittal
Disallow: /vet/test
Disallow: /vet/vtconnect
Disallow: /vet/vth/files/documents/181108-rDVM-Fall-Mailing.pdf

#   Updated by Wright Frazier 4/8/2020 - FP 1289068

Disallow: /vet/addl/covid19partners/

#
# Site Map
#
Sitemap: https://www.purdue.edu/sitemap.xml 
#
# Added College of Science sitemap.xml file per Nina Haghighi - FP 1719630
#
Sitemap: https://www.purdue.edu/science/sitemap.xml
sitemap.xml 200 OK
Type URL Set URLs 37408 entries Valid XML No
Sample URLs:
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.purdue.edu/
200https://purdue.edu/

Inconsistent — duplicate content risk

HTTP → HTTPS

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

Consistent

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

Certificate validity

184
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, 766 ms lookup
PASS
1 A records, 766 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 128.210.7.200
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
No IPv6 (AAAA) records
Info::
3 nameserver(s) configured
Got: ns4.purdue.edu, ns3.purdue.edu, ns5.purdue.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 (766 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 766 ms
A128.210.7.200
AAAA—
CNAME—
NSns4.purdue.edu, ns3.purdue.edu, ns5.purdue.edu
MX
0 purdue-edu.mail.protection.outlook.com
TXT
facebook-domain-verification=izc7cwx7c6ynlbzt3bvcasz2natro9
8c707d78-2dc6-4bac-b4f9-4f2ff625f327
cisco-ci-domain-verification=5e16bdfb5c92c6d57a381bafa4689d833ce3fed29b3c973bfab...
bw=ukH9x7TrdldFT0SuYfXZ8aOBpFT8H6VI3GtpDr5RdXfU
apple-domain-verification=PR5U9BqX66R0APG8
MS=6F64A1C5D9A24164AA0A7E59CC8C1E7758DE8E88
adobe-idp-site-verification=82aaf4b4-e1ab-4a7d-bea2-10f5820faec9
autodesk-domain-verification=0mpL8cXJsDjFqdB61_oM
SPF v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email include:spf.protection.o...
#^0zq4LIZZq&CRglVz*@h6QFrQYfE%r9YPjtMugJ!pfYMDS%Y&PYMB0@TDM@R%fbcn#ZZZDfrpH2qO#@...
airtable-verification=b01c1d3515c017805e817e21360a0506
atlassian-domain-verification=rwaaUqSzGwq84NSUvMqT86CCHDKF7TMyoaPiQVgP6sQUY3/aea...
jamf-site-verification=VaeBGvW_vGEVdXlQmlspfQ
webexdomainverification.GDSP=4bd98732-2799-47d1-bbd3-66e6149d1cad
oysmqwNak8YGUW3sLWwJg1feIr+RzjS3GAjdI6bSHjLGftS6HmMqoAUagGXLrjogVk4ptcEPz+5oyrWQ...
n98pbk2retfsg11ronqr8158mu
brevo-code:231c553f8bfc20a63e4de939455f5991
airtable-verification=532cf661a9f1ce7337e69babb11917de
_globalsign-domain-verification=LBGN_PGPzs-K_ugvlmQc5pBRof3QCVximyhc9hNKsU
google-site-verification=en6dTnGVvW0yFBlNPxKv5aSBsJNG9XTRlJLx5xzkEGE
atlassian-domain-verification=YwCJ4gAdGrIy4Trr5Fq2mBW41Vo4HOdkqNXNFssajAgT0sPIhk...
CAALookup not available with standard resolver
Resolved in 766 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+
Redirect Chain
No redirects — direct access
PASS
No redirects — direct access
Info::
No redirects — direct access
Got: https://purdue.edu

https://purdue.edu

588 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://purdue.edu200588 msHTTP/1.1
A+
Domain Intelligence
purdue.edu — 41 years, 7 months old, hosted on PURDUE - Purdue University, US
PASS
purdue.edu — 41 years, 7 months old, hosted on PURDUE - Purdue University, US
Info::
Domain registered until Jul 31, 2026 (3 months remaining)
Info::
Hosting: PURDUE - Purdue University, US
Got: AS17
Domain expiry

16 days

July 31, 2026

SSL certificate

184 days

Issued by Internet2

Domain age

41 years, 7 months

Registered April 24, 1985

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

PURDUE - Purdue University, US

ASN AS17

128.210.7.200

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 domain or enable auto-renewal to prevent accidental expiry
Registrar
Created April 24, 1985 (41 years, 7 months ago)
Expires July 31, 2026 (3 months)
Last Updated April 20, 2026
Name Servers ns3.purdue.edu, ns4.purdue.edu, ns5.purdue.edu
Registrant Purdue University
Hosting
IP Address 128.210.7.200
ASN AS17 (PURDUE - Purdue University, US)
Provider PURDUE - Purdue University, US
Data source: whois (1.1s)
A
HTTP Probe Timing
Total 714 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
129 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
141 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
145 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
574 ms
Total Time Total request time from DNS lookup through full response.
714 ms

Connection waterfall

DNS Lookup 129 ms TCP Connect 141 ms TLS Handshake 145 ms Server Processing 159 ms Content Transfer 141 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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