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https://rpi.edu

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
81
GRADE
B
FIX
1
REVIEW
2
PASS
6
INFO
0
Probed from Santa Clara, United States
301 Moved Permanently
Checks
9
6 PASS 2 REVIEW 1 FIX
F
IPv6 Readiness
Action
IPv6 records exist but unreachable
FIX
IPv6 records exist but unreachable
Warning::
IPv6 DNS records exist but server is not reachable
Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.
Got: 2620:12a:8000::3, 2620:12a:8001::3
Info::
IPv6 connection error
Got: dial tcp6 [2620:12a:8000::3]:443: connect: network is unreachable
IPv6 Misconfigured
AAAA Records 2620:12a:8000::3, 2620:12a:8001::3 Connection UNREACHABLE

Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.

Why this matters

Advertising IPv6 (AAAA records) without a reachable server means IPv6-preferring clients silently fail every connection.

Learn more ▾

Modern browsers prefer IPv6 if AAAA exists (Happy Eyeballs algorithm). If the IPv6 server isn't reachable, browsers fall back to IPv4 — but with seconds of added latency per request. Either fix IPv6 reachability or remove the AAAA records.

Source: RFC 8305 (Happy Eyeballs)

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.rpi.edu/
200https://rpi.edu/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://rpi.edu/ → https://rpi.edu/

Consistent

B
TLS Certificate Expiry & Recommendations
61 days until leaf cert expires — 5 issues to address
REVIEW

Certificate validity

61
days left
0d 30d 60d 90d+

Recommended actions

  • Extend HSTS max-age to at least 31536000 (1 year) to meet the preload list criteria
  • Add includeSubDomains to the HSTS directive
  • Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
  • 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, 129 ms lookup
PASS
1 A records, 129 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 23.185.0.3
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2620:12a:8000::3, 2620:12a:8001::3
Info::
3 nameserver(s) configured
Got: dns3.rpi.edu, dns2.rpi.edu, dns11.rpi.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
Info::
DNS resolution time: 129 ms
Got: 129 ms
A23.185.0.3
AAAA2620:12a:8000::3, 2620:12a:8001::3
CNAME—
NSdns3.rpi.edu, dns2.rpi.edu, dns11.rpi.edu
MX
1 mail.rpi.edu
TXT
@ MS=ms38237274 3600
duo_sso_verification=Cf7JHuYRYAsrjTBcUzgB9EkngPpSc7kVivy8OQnlX4huv8IdeDQ6O4efo6B...
apple-domain-verification=Ief7NnC1RdkuXdLy
abuseipdb-verification=fsZcG391
google-gws-recovery-domain-verification=57180753
smartsheet-site-validation=zVnG5_eYRtqMKCyoGPb7m2BsQhR9qHMs
UOv6dt1K0vs/pKfTPio7rnOfZJFDki1mvy8KKtX1p1TILTWtPsV1iT0ly3WckGC46onnD/BMWt5p9sgH...
SPF v=spf1 ip4:128.113.1.200/29 ip4:128.113.1.208 ip4:128.113.26.109 ip4:159.112.250...
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDiQDOpEjcaKLrR1/ppMLxbvk...
fortinet-fortiphish-site-verification=h5FeGJVJzFNLUJEL8LyseQ
adobe-idp-site-verification=aed76f36bfd7702df0cebf5a11851537e120e5a9ccb93b058794...
google-site-verification=-F7MdHVAGhjx_VyONSJfPwSCxoac1YYKe4JHD55PGHQ
MS=ms47037963
openai-domain-verification=dv-B3JOUs2DCTFCLMTKbnLTYsuV
CAALookup not available with standard resolver
Resolved in 129 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), 214 ms total
PASS
1 redirect(s), 214 ms total
Info::
Single redirect
Got: https://rpi.edu → https://www.rpi.edu/ (301)
Info::
WWW normalization redirect

https://rpi.edu

29 ms · HTTP/1.1

301

https://www.rpi.edu/

185 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://rpi.edu30129 msHTTP/1.1nginx
2https://www.rpi.edu/200185 msHTTP/1.1nginx

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 24 URLs
PASS
robots.txt present, sitemap with 24 URLs
Info::
robots.txt is present
Got: 2093 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 24 entries
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 2093 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
#
# robots.txt
#
# This file is to prevent the crawling and indexing of certain parts
# of your site by web crawlers and spiders run by sites like Yahoo!
# and Google. By telling these "robots" where not to go on your site,
# you save bandwidth and server resources.
#
# This file will be ignored unless it is at the root of your host:
# Used:    http://example.com/robots.txt
# Ignored: http://example.com/site/robots.txt
#
# For more information about the robots.txt standard, see:
# http://www.robotstxt.org/robotstxt.html

User-agent: *
# CSS, JS, Images
Allow: /core/*.css$
Allow: /core/*.css?
Allow: /core/*.js$
Allow: /core/*.js?
Allow: /core/*.gif
Allow: /core/*.jpg
Allow: /core/*.jpeg
Allow: /core/*.png
Allow: /core/*.svg
Allow: /profiles/*.css$
Allow: /profiles/*.css?
Allow: /profiles/*.js$
Allow: /profiles/*.js?
Allow: /profiles/*.gif
Allow: /profiles/*.jpg
Allow: /profiles/*.jpeg
Allow: /profiles/*.png
Allow: /profiles/*.svg
# Directories
Disallow: /core/
Disallow: /profiles/
# Files
Disallow: /README.md
Disallow: /composer/Metapackage/README.txt
Disallow: /composer/Plugin/ProjectMessage/README.md
Disallow: /composer/Plugin/Scaffold/README.md
Disallow: /composer/Plugin/VendorHardening/README.txt
Disallow: /composer/Template/README.txt
Disallow: /modules/README.txt
Disallow: /sites/README.txt
Disallow: /themes/README.txt
# Paths (clean URLs)
Disallow: /admin/
Disallow: /comment/reply/
Disallow: /filter/tips
Disallow: /node/add/
Disallow: /search/
Disallow: /user/register
Disallow: /user/password
Disallow: /user/login
Disallow: /user/logout
Disallow: /media/oembed
Disallow: /*/media/oembed
# Paths (no clean URLs)
Disallow: /index.php/admin/
Disallow: /index.php/comment/reply/
Disallow: /index.php/filter/tips
Disallow: /index.php/node/add/
Disallow: /index.php/search/
Disallow: /index.php/user/password
Disallow: /index.php/user/register
Disallow: /index.php/user/login
Disallow: /index.php/user/logout
Disallow: /index.php/media/oembed
Disallow: /index.php/*/media/oembed

User-agent: *
Disallow: *.pdf
Disallow: *.doc

Sitemap: https://www.rpi.edu/sitemap.xml
sitemap.xml 200 OK
Type URL Set URLs 24 entries Valid XML Yes
Sample URLs:
A+
Domain Intelligence
rpi.edu — 40 years, 7 months old, hosted on Fastly
PASS
rpi.edu — 40 years, 7 months old, hosted on Fastly
Info::
Domain registered until Jul 31, 2027 (1 years, 3 months remaining)
Info::
Hosting: Fastly
Got: AS54113
Domain expiry

410 days

July 31, 2027

SSL certificate

61 days

Issued by Let's Encrypt

Domain age

40 years, 7 months

Registered March 25, 1986

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

Fastly

ASN AS54113

23.185.0.3

Registrar

Registrar unknown

Lock status unknown 3 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Registrar
Created March 25, 1986 (40 years, 7 months ago)
Expires July 31, 2027 (1 years, 3 months)
Last Updated August 12, 2024
Name Servers dns3.rpi.edu, dns11.rpi.edu, dns2.rpi.edu
Registrant Rensselaer Polytechnic Institute
Hosting
IP Address 23.185.0.3
ASN AS54113 (FASTLY - Fastly, Inc., US)
Provider Fastly
Data source: whois (0.3s)
A+
HTTP Probe Timing
Total 94 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
72 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
2 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
6 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
95 ms
Total Time Total request time from DNS lookup through full response.
95 ms

Connection waterfall

DNS Lookup 72 ms TCP Connect 2 ms TLS Handshake 6 ms Server Processing 15 ms Content Transfer 0 ms
A+
CDN & Delivery
Fastly (HIT, HIT, MISS, MISS)
PASS
Fastly (HIT, HIT, MISS, MISS)
Info::
Site is served via Fastly CDN
Got: x-served-by: cache-chi-klot8100111-CHI, cache-sjc10044-SJC, cache-sjc1000094-SJC, cache-sjc1000094-SJC
Info::
CDN cache status: HIT, HIT, MISS, MISS
CDN Detected: Fastly
Provider Fastly Cache Status HIT, HIT, MISS, MISS Evidence x-served-by: cache-chi-klot8100111-CHI, cache-sjc10044-SJC, cache-sjc1000094-SJC, cache-sjc1000094-SJC
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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