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Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
90
GRADE
A
FIX
1
REVIEW
3
PASS
4
INFO
1
Probed from Madrid, Spain
200 OK
Checks
9
4 PASS 3 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
Crawlability
robots.txt present, no sitemap
REVIEW
robots.txt present, no sitemap
Info::
robots.txt is present
Got: 702 bytes
Info::
No sitemap.xml found
A sitemap helps search engines discover and index your pages more efficiently.
Info::
robots.txt does not reference a sitemap
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

A sitemap helps search engines discover and index your pages more efficiently.

Why this matters

No sitemap.xml — Google relies on crawl-graph discovery alone, slowing indexing of deep or fresh URLs.

Learn more ▾

A sitemap accelerates Google's discovery of new and updated content. Most CMSes auto-generate one; static-site frameworks need a build-step plugin. Reference it from robots.txt and submit in Search Console to confirm Google can fetch it.

Source: sitemaps.org / Google Search Central

Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

Why this matters

robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.

Source: sitemaps.org

robots.txt 200 OK
Size 702 B Sitemaps referenced 0 User-agents Googlebot-Image, Googlebot-News, Mediapartners-Google, psbot, *, ia_archiver Blocking No — crawling allowed
#  Robots file listing html directories NOT to search on www.ibiblio.org

User-agent: *
Crawl-delay: 2
Disallow: /dbarberi/wiki/
Disallow: /designerunits/images/
Disallow: /designerunits/image*/
Disallow: /footy/tools/
Disallow: /herbmed/getit.php
Disallow: /mcmahon/emusic-l/
Disallow: /ncdarts/bcdl/search/
Disallow: /rtpnet/archives/
Disallow: /schools/fpg/
Disallow: /ser/cvs/

User-agent: ia_archiver
Disallow: /fred/
Disallow: /herbmed/
Disallow: /swsbm/
Disallow: /designerunits/

User-agent: Googlebot-Image
Disallow: /designerunits/

User-agent: Googlebot-News
Disallow: /designerunits/

User-agent: Mediapartners-Google
Disallow: /designerunits/

User-agent: psbot
Disallow: /designerunits/
sitemap.xml No sitemap found

No sitemap found

Adding a sitemap helps search engines discover your pages.

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.ibiblio.org/
200https://ibiblio.org/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://ibiblio.org/ → https://ibiblio.org/

Consistent

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

Certificate validity

193
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, 114 ms lookup
PASS
1 A records, 114 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 152.19.134.40
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: 2606:f640:6000:321:0:bad:cafe:23
Info::
2 nameserver(s) configured
Got: ns.unc.edu, ns2.unc.edu
Info::
7 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: 114 ms
Got: 114 ms
A152.19.134.40
AAAA2606:f640:6000:321:0:bad:cafe:23
CNAME—
NSns.unc.edu, ns2.unc.edu
MX
10 aspmx.l.google.com
20 alt2.aspmx.l.google.com
20 alt1.aspmx.l.google.com
30 aspmx3.googlemail.com
30 aspmx2.googlemail.com
30 aspmx5.googlemail.com
30 aspmx4.googlemail.com
TXT
SPF v=spf1 include:_spf.google.com ~all
CAALookup not available with standard resolver
Resolved in 114 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://ibiblio.org

https://ibiblio.org

343 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://ibiblio.org200343 msHTTP/1.1
A+
IPv6 Readiness
IPv6 reachable (104 ms)
PASS
IPv6 reachable (104 ms)
Info::
IPv6 is configured and reachable at 2606:f640:6000:321:0:bad:cafe:23
Got: 104 ms connect
IPv6 Ready
AAAA Records 2606:f640:6000:321:0:bad:cafe:23 Connection Reachable (104 ms)
A
HTTP Probe Timing
Total 452 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
118 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
108 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
117 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
453 ms
Total Time Total request time from DNS lookup through full response.
453 ms

Connection waterfall

DNS Lookup 118 ms TCP Connect 108 ms TLS Handshake 117 ms Server Processing 110 ms Content Transfer 0 ms
Domain Intelligence
Domain intelligence data not available
INFO
Domain intelligence data not available

RDAP and WHOIS lookup both failed

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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