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https://usc.edu

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
95
GRADE
A
FIX
0
REVIEW
2
PASS
7
INFO
0
Probed from Sao Paulo, Brazil
200 OK
Checks
9
7 PASS 2 REVIEW
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.usc.edu/
200https://usc.edu/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://usc.edu/ → https://usc.edu/

Consistent

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

Certificate validity

85
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, 12 ms lookup
PASS
1 A records, 12 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:8001::3, 2620:12a:8000::3
Info::
2 nameserver(s) configured
Got: ns0163.secondary.cloudflare.com, ns0037.secondary.cloudflare.com
Info::
2 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: 12 ms
Got: 12 ms
A23.185.0.3
AAAA2620:12a:8001::3, 2620:12a:8000::3
CNAME—
NSns0163.secondary.cloudflare.com, ns0037.secondary.cloudflare.com
MX
50 mx0a-00164701.pphosted.com
50 mx0b-00164701.pphosted.com
TXT
3b3ivpda2f10se3nn7olfrfucj
71MB6F28FTH9N79MPH1TN49H6E
MS=ms20859340
SFMC-amtHrwXeF3C5rm2Ha9E3H_dpDHSLFtemkbvrt-wI
amazonses:pdFwTbWzxT9aEG1QWjQIN1JQ2Nde7PSWZbDNYgLiJII=
apple-domain-verification=f8jvjXpxkZuZImoG
apple-domain-verification=r8UAnaLgMQbbCPYH
asv=1147b35e22e2230f3e7ed7ef96d0b3cb
atlassian-domain-verification=kSvetIKe/diM5FGbD37dFnvsdAGwPgNFtgM/1L2RoLFZeXaHp8...
atlassian-domain-verification=oLsWbvIwAA0zKHIxnOG4nKuc6JJRY91TD/04xw1nbNohMNkiiB...
b121225d-7ecf-4ab1-9a6c-0498793bc091
box-domain-verification=3430746f12c99e884185c424a68a8074130e28056a6c457bbe05730d...
brevo-code:c8ebd56e46efa8226729d35478a57103
cisco-ci-domain-verification=4c96d65a1a9921efe23d594af51d2534c089b7ac61d461b7a98...
docusign=0e8d546c-c2fe-412d-be88-b3c7fc36e4e9
docusign=b64b37c7-7a9d-4b6d-9093-07e862bada10
dropbox-domain-verification=q9fk5cnf7e8z
e2ma-verification=31b
e2ma-verification=5gfgb
e2ma-verification=f2fgb
e2ma-verification=jafgb
e2ma-verification=t5egb
e2ma-verification=vffgb
ecee88b3-e854-43c4-936d-f88a3eabc95a
google-site-verification=2Z-mrJy4KQmEzVpdrZOonGhzDjNR6vC44p-NG6ks0Bw
google-site-verification=7jISKLgSY6Xj9zt1ZjvoVsHZvOMpGjgzih8xn6sDoXA
google-site-verification=nojeOyc6lI8uv7PtvYD47Elxa4EAw8unfUWjovYIfOQ
hpe-greenlake-domain-verification=4d42657379582d505849316c4355583579776d49765864...
openai-domain-verification=dv-jiiDIH1uxImkWv50c2smvCIs
pardot_137301_*=10c850f0ce73fd1f680c3edc78532b93f96e586561ff743a37eec44f63731125
pardot_137301_*=65e54b29681de123cb44a1079735eb760ede531320b27768f921b2fe7a59efa0
teamviewer-sso-verification=65d375c2d6374c5a991d77de3d1949a0
SPF v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com ~all
CAALookup not available with standard resolver
Resolved in 12 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
No redirects — direct access
PASS
No redirects — direct access
Info::
No redirects — direct access
Got: https://usc.edu

https://usc.edu

20 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://usc.edu20020 msHTTP/1.1nginx
A+
IPv6 Readiness
IPv6 reachable (1 ms)
PASS
IPv6 reachable (1 ms)
Info::
IPv6 is configured and reachable at 2620:12a:8001::3, 2620:12a:8000::3
Got: 1 ms connect
IPv6 Ready
AAAA Records 2620:12a:8001::3, 2620:12a:8000::3 Connection Reachable (1 ms)
A+
Crawlability
robots.txt present, sitemap with 6 URLs
PASS
robots.txt present, sitemap with 6 URLs
Info::
robots.txt is present
Got: 288 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 6 entries
Info::
Sitemap index with 6 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 288 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
# START YOAST BLOCK
# ---------------------------
User-agent: *
Disallow: /wp-includes/
Disallow: /wp-login.php
Disallow: /wp-admin/*
Disallow: /wp-register.php
Disallow: /*/page/
Disallow: *.pdf$

Sitemap: https://usc.edu/sitemap_index.xml
# ---------------------------
# END YOAST BLOCK
sitemap.xml 200 OK
Type Sitemap Index URLs 6 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
usc.edu — 41 years, 3 months old
PASS
usc.edu — 41 years, 3 months old
Info::
Domain registered until Jul 31, 2026 (3 months remaining)
Domain expiry

16 days

July 31, 2026

SSL certificate

85 days

Issued by Let's Encrypt

Domain age

41 years, 3 months

Registered August 20, 1985

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

Unknown

2620:12a:8000::3

Registrar

Registrar unknown

Lock status unknown 2 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 August 20, 1985 (41 years, 3 months ago)
Expires July 31, 2026 (3 months)
Last Updated July 8, 2024
Name Servers ns0163.secondary.cloudflare.com, ns0037.secondary.cloudflare.com
Registrant University of Southern California
Hosting
IP Address 2620:12a:8000::3
Data source: whois (0.8s)
A+
HTTP Probe Timing
Total 22 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
6 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
1 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
5 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
19 ms
Total Time Total request time from DNS lookup through full response.
23 ms

Connection waterfall

DNS Lookup 6 ms TCP Connect 1 ms TLS Handshake 5 ms Server Processing 7 ms Content Transfer 3 ms
A+
CDN & Delivery
Fastly (HIT, HIT)
PASS
Fastly (HIT, HIT)
Info::
Site is served via Fastly CDN
Got: x-served-by: cache-chi-kigq8000114-CHI, cache-gru-sbsp2090062-GRU
Info::
CDN cache status: HIT, HIT
CDN Detected: Fastly
Provider Fastly Cache Status HIT, HIT Evidence x-served-by: cache-chi-kigq8000114-CHI, cache-gru-sbsp2090062-GRU
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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