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https://unc.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::4, 2620:12a:8001::4
Info::
IPv6 connection error
Got: dial tcp6 [2620:12a:8000::4]:443: connect: network is unreachable
IPv6 Misconfigured
AAAA Records 2620:12a:8000::4, 2620:12a:8001::4 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.unc.edu/
200https://unc.edu/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://unc.edu/ → https://unc.edu/

Consistent

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

Certificate validity

63
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, 82 ms lookup
PASS
1 A records, 82 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 23.185.0.4
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::4, 2620:12a:8001::4
Info::
4 nameserver(s) configured
Got: ns2.unc.edu, ns-02.mcnc.org, ns-01.mcnc.org, ns.unc.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: 82 ms
Got: 82 ms
A23.185.0.4
AAAA2620:12a:8000::4, 2620:12a:8001::4
CNAME—
NSns2.unc.edu, ns-02.mcnc.org, ns-01.mcnc.org, ns.unc.edu
MX
0 unc-edu.mail.protection.outlook.com
TXT
google-site-verification=7GHvmp9Y6WJ1eCsjvkI4XLor4uswaIDgVg9LDl_kqkg
google-site-verification=ZYlQnKZMg8quOCig_dQi7fBZ6Yyd2o7yTrxekrp7GNI
jamf-site-verification=Fq8fepJhW6_7w8NG8JYwhA
adobe-idp-site-verification=88050a1e-afb6-413e-9eed-8bfc2844c076
LKTxXZvEy4KwMa3icGL7Yw86YXgQyAM5TzFW1T/NV43jzf93KIN8yCEVR/giXwKPJH2B4uEDAHdsw24S...
0ed1fe018a73a8ce4306844bdfac2a10c87b4ac950
_globalsign-domain-verification=RsE9z_LV7XU284qNCorJt_3L3YeV22GJTenam2LO5w
fastly-domain-delegation-MC7P96kKGMnuDw7zbjoQ-08/27/2020
SPF v=spf1 ip4:152.2.79.86 ip4:152.2.79.87 ip4:152.2.79.94 include:spf.protection.ou...
atlassian-domain-verification=B95aBgJ5XQdjoCo0p56yxZjvXHQfxcZWsgsq9qEx2qg5CZuSVh...
CAALookup not available with standard resolver
Resolved in 82 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), 129 ms total
PASS
1 redirect(s), 129 ms total
Info::
Single redirect
Got: https://unc.edu → https://www.unc.edu/ (301)
Info::
WWW normalization redirect

https://unc.edu

103 ms · HTTP/1.1

301

https://www.unc.edu/

25 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://unc.edu301103 msHTTP/1.1nginx
2https://www.unc.edu/20025 msHTTP/1.1nginx

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 19 URLs
PASS
robots.txt present, sitemap with 19 URLs
Info::
robots.txt is present
Got: 169 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 19 entries
Info::
Sitemap index with 19 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 169 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
# START YOAST BLOCK
# ---------------------------
User-agent: *
Disallow:

Sitemap: https://www.unc.edu/sitemap_index.xml
# ---------------------------
# END YOAST BLOCK
sitemap.xml 200 OK
Type Sitemap Index URLs 19 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
unc.edu — 40 years, 5 months old, hosted on Fastly
PASS
unc.edu — 40 years, 5 months old, hosted on Fastly
Info::
Domain registered until Jul 31, 2028 (2 years, 3 months remaining)
Info::
Hosting: Fastly
Got: AS54113
Domain expiry

750 days

July 31, 2028

SSL certificate

63 days

Issued by Let's Encrypt

Domain age

40 years, 5 months

Registered June 17, 1986

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

Fastly

ASN AS54113

23.185.0.4

Registrar

Registrar unknown

Lock status unknown 4 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Registrar
Created June 17, 1986 (40 years, 5 months ago)
Expires July 31, 2028 (2 years, 3 months)
Last Updated July 1, 2025
Name Servers ns.unc.edu, ns-01.mcnc.org, ns-02.mcnc.org, ns2.unc.edu
Registrant University of North Carolina at Chapel Hill
Hosting
IP Address 23.185.0.4
ASN AS54113 (FASTLY - Fastly, Inc., US)
Provider Fastly
Data source: whois (0.4s)
A+
HTTP Probe Timing
Total 104 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
83 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.
7 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
105 ms
Total Time Total request time from DNS lookup through full response.
105 ms

Connection waterfall

DNS Lookup 83 ms TCP Connect 1 ms TLS Handshake 7 ms Server Processing 14 ms Content Transfer 0 ms
A+
CDN & Delivery
Fastly (MISS, HIT, MISS, MISS)
PASS
Fastly (MISS, HIT, MISS, MISS)
Info::
Site is served via Fastly CDN
Got: x-served-by: cache-chi-klot8100059-CHI, cache-sjc1000118-SJC, cache-sjc10061-SJC, cache-sjc10061-SJC
Info::
CDN cache status: MISS, HIT, MISS, MISS
CDN Detected: Fastly
Provider Fastly Cache Status MISS, HIT, MISS, MISS Evidence x-served-by: cache-chi-klot8100059-CHI, cache-sjc1000118-SJC, cache-sjc10061-SJC, cache-sjc10061-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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