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https://illinois.edu

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
97
GRADE
A+
FIX
1
REVIEW
1
PASS
7
INFO
0
Probed from Madrid, Spain
200 OK
Checks
9
7 PASS 1 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
TLS Certificate Expiry & Recommendations
230 days until leaf cert expires — 5 issues to address
REVIEW

Certificate validity

230
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, 334 ms lookup
PASS
1 A records, 334 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 64.236.243.124
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: 2a01:111:f100:1002::4134:dc6d
Info::
3 nameserver(s) configured
Got: dns1.illinois.edu, dns3.illinois.edu, dns2.illinois.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 (334 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 334 ms
A64.236.243.124
AAAA2a01:111:f100:1002::4134:dc6d
CNAME—
NSdns1.illinois.edu, dns3.illinois.edu, dns2.illinois.edu
MX
10 incoming-relays.illinois.edu
TXT
airtable-verification=28fb993b5e5a434a871a156d33869136
pexip-ms-tenant-domain-verification=bff852d2-fb8f-4632-9c85-bc2c071c502b
adobe-idp-site-verification={150d748e-9d9e-4454-b347-c422a8e94045}
bw=FhyVncFk3KO1JtAsPgEMf3OzQMjGGH/njOxJ3MH009F/
MS=ms64069560
d365mktkey=QjHZW2tV2djugxh4a0dMR8FPzKXgneQaIFwhtVUM1iox
work-accounts-domain-verification=Jbmb07ByrJY712UexVfsQXiwBOH2Rw
openai-domain-verification=dv-nYRIJFGdMjmQyuDMnFbUKqt9
google-site-verification=zfHYNU7QVMwwZcdfGWY5TPXdPle-UtcpMGbD27k0lLY
d365mktkey=QFJVdlJ4jHu40ev0vmpYiZz65AyJ0bj8iW8bt8jKgHsx
sending_domain1030311=be47af19d13cf8e3e35e103de39301cdabc71521e0c982ef50faf39549...
miro-verification=6f86b16dbd160af6f01c0846dc4d1144693d881a
atlassian-domain-verification=ebs4HtRaugGl/IadlP43zjrOZfEynVnZ0pCpm3u0A6/n97m76o...
adobe-idp-site-verification=871c897f-f9d7-47bc-804f-f437f4717c94
google-site-verification=vlBFbVILoXwbGHs74_9u2mBbWZ-6kLREGuaphWElMmQ
google-site-verification=IshbA56YD-JnQuVNN1qlCMR3a6JBsKTTXo4DVQdAkHo
airtable-verification=cc762a9bc02471eb7162872f91d30f1c
e2ma-verification=wnucb
knowbe4-site-verification=b0e704ec1aa759a7f070aebdf6a09436
SPF v=spf1 redirect=_spf.illinois.edu
rfsEZw8zMtKJJvwgk0d2qO2vPmVh2V8Q36D8I0v2PVPQbqvGMnoXcuRimASa0jvo4nZp330SpVsn9699...
docusign=12076312-3a39-4496-ba79-e87bee5f3df6
jamf-site-verification=MkmfrXvvuifJ54RMXhygKA
spf2.0/pra
HmRccqbkceLf+95IJQ7QAel3EekYl6RlKAvVCi397hXwBjJj225B5ty6kAX3jXEFxJps5CaXUYcox6B7...
CAALookup not available with standard resolver
Resolved in 334 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://illinois.edu

https://illinois.edu

494 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://illinois.edu200494 msHTTP/1.1nginx/1.28.1
A+
IPv6 Readiness
IPv6 reachable (125 ms)
PASS
IPv6 reachable (125 ms)
Info::
IPv6 is configured and reachable at 2a01:111:f100:1002::4134:dc6d
Got: 125 ms connect
IPv6 Ready
AAAA Records 2a01:111:f100:1002::4134:dc6d Connection Reachable (125 ms)
A+
Crawlability
robots.txt present, sitemap with 3 URLs
PASS
robots.txt present, sitemap with 3 URLs
Info::
robots.txt is present
Got: 110 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 3 entries
Info::
Sitemap index with 3 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 110 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
User-agent: *
Disallow: /wp-admin/
Allow: /wp-admin/admin-ajax.php

Sitemap: https://illinois.edu/sitemaps.xml
sitemap.xml 200 OK
Type Sitemap Index URLs 3 entries Valid XML Yes
Child Sitemaps:
A+
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
PASS
www/non-www, trailing slash, HTTP→HTTPS
Info::
www/non-www redirect configured correctly (preferred: non-www)
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

301https://www.illinois.edu/
200https://illinois.edu/

Preferred variant: non-www

HTTP → HTTPS

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

Consistent

A+
Domain Intelligence
illinois.edu — 29 years, 8 months old
PASS
illinois.edu — 29 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

230 days

Issued by Internet2

Domain age

29 years, 8 months

Registered January 13, 1997

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

Unknown

2a01:111:f100:1002::4134:dc6d

Registrar

Registrar unknown

Lock status unknown 3 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Registrar
Created January 13, 1997 (29 years, 8 months ago)
Expires July 31, 2027 (1 years, 3 months)
Last Updated June 21, 2024
Name Servers dns1.illinois.edu, dns2.illinois.edu, dns3.illinois.edu
Registrant University of Illinois
Hosting
IP Address 2a01:111:f100:1002::4134:dc6d
Data source: whois (0.8s)
A
HTTP Probe Timing
Total 590 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
121 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
115 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
118 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
583 ms
Total Time Total request time from DNS lookup through full response.
590 ms

Connection waterfall

DNS Lookup 121 ms TCP Connect 115 ms TLS Handshake 118 ms Server Processing 229 ms Content Transfer 7 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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