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Infrastructure

· 17 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
91
GRADE
A
FIX
1
REVIEW
9
PASS
6
INFO
1
Probed from Madrid, Spain
200 OK
Checks
17
6 PASS 9 REVIEW 1 FIX
D
CDN & Delivery
Action
No CDN (document or assets)
FIX
No CDN (document or assets)
Warning::
No CDN (document or assets)
Neither the HTML document nor the page's subresources are served through an edge network. A CDN can significantly improve load times for users around the world by caching content at edge nodes closer to them.
Got: document origin: Google
No CDN (document or assets)
Document origin Google

Consider using a CDN to improve global delivery speed and reduce origin load.

B
DNS Records
1 A records, 25 ms lookup
REVIEW
1 A records, 25 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 192.178.156.132
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: 2a00:1450:4013:c1c::84
Warning::
CNAME record at zone apex
A CNAME at the zone apex can break MX and NS records. Use ALIAS/ANAME or A records instead.
Got: blogspot.l.googleusercontent.com
Info::
No NS records found
Info::
No MX records — email not configured via DNS
Info::
No SPF record found in TXT records
SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.
Info::
DNS resolution time: 25 ms
Got: 25 ms
A192.178.156.132
AAAA2a00:1450:4013:c1c::84
CNAMEblogspot.l.googleusercontent.com
NS—
MX—
TXT—
CAALookup not available with standard resolver
Resolved in 25 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

A CNAME at the zone apex can break MX and NS records. Use ALIAS/ANAME or A records instead.

Why this matters

CNAME at the apex (example.com) breaks every other apex record (MX, TXT, NS) — DNS-protocol violation per RFC 1034.

Learn more ▾

RFC 1034 forbids CNAME alongside other records at the same name. Some DNS providers offer ALIAS / ANAME / flattened-CNAME records that work around this — use those instead. Otherwise apex-level CNAME breaks email (no MX), domain ownership verification (no TXT), and more.

Source: RFC 1034

SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.

Why this matters

Without SPF, receiving servers can't validate sending IPs — your domain is easier to spoof in phishing.

Learn more ▾

SPF complements DMARC. Both should be published. SPF records list authorized sending IPs (e.g., `v=spf1 include:_spf.google.com ~all` for Google Workspace). After publishing, verify in Google Postmaster Tools or mxtoolbox.

Source: RFC 7208 (SPF)

B
DNSSEC
Unsigned (DNSSEC not deployed)
REVIEW
Unsigned (DNSSEC not deployed)
Info::
DNSSEC is not deployed
The zone is not DNSSEC-signed. Users on validating resolvers (Cloudflare 1.1.1.1, Quad9 9.9.9.9, growing default in mobile resolvers) get no protection against DNS spoofing for this domain. Most registrars now offer DNSSEC at a single click; consider enabling it for sites where authenticity matters (banking, healthcare, government).
B
CAA Records
No CAA records (any CA may issue certificates)
REVIEW
No CAA records (any CA may issue certificates)
Info::
No CAA records published
Without CAA records, any publicly-trusted CA can issue certificates for this domain. Adding a CAA record (`yourdomain. IN CAA 0 issue "letsencrypt.org"`) restricts issuance to CAs you authorize. Required by CAB Forum baseline since 2017; the default of 'any CA' is widely supported but is the broader attack surface for issuance fraud.
B
Reverse DNS
0/2 IPs match cert SAN
REVIEW
0/2 IPs match cert SAN
Info::
PTR for 192.178.156.132 does not match any cert SAN: yugrqog-in-f132.1e100.net
Common when behind a CDN or shared hosting (PTR points at the provider's hostname). Mismatch can also affect mail deliverability if this IP sends email -- many MTAs reject mail when forward+reverse DNS disagree.
Info::
PTR for 2a00:1450:4013:c1c::84 does not match any cert SAN: yugrqog-in-f132.1e100.net
Common when behind a CDN or shared hosting (PTR points at the provider's hostname). Mismatch can also affect mail deliverability if this IP sends email -- many MTAs reject mail when forward+reverse DNS disagree.
B
HTTP Probe Timing
Total 893 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
REVIEW
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
23 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
28 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
33 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
877 ms
Total Time Total request time from DNS lookup through full response.
893 ms

Connection waterfall

DNS Lookup 23 ms TCP Connect 28 ms TLS Handshake 33 ms Server Processing 793 ms Content Transfer 16 ms
B
TLS Certificate Expiry & Recommendations
52 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

52
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
B
CDN Cache Observability
No CDN cache-status headers in the response
REVIEW
No CDN cache-status headers in the response
Info::
No CDN cache-status headers in the response
Without an X-Cache / CF-Cache-Status / X-Vercel-Cache / Age header, you can't tell from outside whether a request hit the cache or went to origin. Operationally important: enables debugging stale-content reports and verifying cache rules. Most managed CDN platforms emit at least one of these by default; absence often means the platform's diagnostic headers are stripped at an upstream proxy.
B
Operational Status Page
No status page link detected
REVIEW
No status page link detected
Info::
No operational status page link detected
Status pages communicate planned maintenance and incidents to users -- a hallmark of operationally-mature services. Most SaaS teams publish one via Atlassian Statuspage, Instatus, BetterUptime, or a self-hosted Cachet. Smaller sites legitimately don't need one; flagged as Info, not a failure.
B
Health Check Endpoint
No conventional health endpoint found
REVIEW
No conventional health endpoint found
Info::
No conventional health endpoint found
Health endpoints (/health, /healthz, /status, /ping, /api/health) let uptime monitors, load balancers, and orchestration systems (Kubernetes, ECS, Fly.io) verify the service is alive. Marketing sites and small services often skip them legitimately; flagged as Info, not a failure. Probe results: /api/health: 404, /health: 404, /healthz: 404, /ping: 404, /status: 404.
A+
Subdomain Takeover
No subdomain takeover risk detected
PASS
No subdomain takeover risk detected
Info::
CNAME does not point at a known takeover-able service
A+
Multi-Resolver DNS Speed
Mean 24ms across 3 resolvers (spread 5ms)
PASS
Mean 24ms across 3 resolvers (spread 5ms)
Info::
Google: 22ms
Got: 22ms via 8.8.8.8:53
Info::
Quad9: 24ms
Got: 24ms via 9.9.9.9:53
Info::
Cloudflare: 27ms
Got: 27ms via 1.1.1.1:53
A+
Redirect Chain
No redirects — direct access
PASS
No redirects — direct access
Info::
No redirects — direct access
Got: https://topicsinsider.blogspot.com

https://topicsinsider.blogspot.com

775 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://topicsinsider.blogspot.com200775 msHTTP/1.1GSE
A+
IPv6 Readiness
IPv6 reachable (28 ms)
PASS
IPv6 reachable (28 ms)
Info::
IPv6 is configured and reachable at 2a00:1450:4013:c1c::84
Got: 28 ms connect
IPv6 Ready
AAAA Records 2a00:1450:4013:c1c::84 Connection Reachable (28 ms)
A+
Crawlability
robots.txt present, sitemap with 19 URLs
PASS
robots.txt present, sitemap with 19 URLs
Info::
robots.txt is present
Got: 97 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 19 entries
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 97 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
User-agent: *
Disallow: /search
Allow: /

Sitemap: https://topicsinsider.blogspot.com/sitemap.xml
sitemap.xml 200 OK
Type URL Set URLs 19 entries Valid XML Yes
Sample URLs:
A+
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
PASS
www/non-www, trailing slash, HTTP→HTTPS
Info::
HTTP correctly redirects to HTTPS permanently
Got: HTTP 301

www / non-www

https://www.topicsinsider.blogspot.com/
200https://topicsinsider.blogspot.com/

HTTP → HTTPS

301http://topicsinsider.blogspot.com/ → https://topicsinsider.blogspot.com/

Consistent

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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