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Infrastructure

· 17 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
90
GRADE
A
FIX
0
REVIEW
10
PASS
6
INFO
1
Probed from Madrid, Spain
200 OK
Checks
17
6 PASS 10 REVIEW
B
DNS Records
1 A records, 24 ms lookup
REVIEW
1 A records, 24 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 172.217.22.33
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: 2a00:1450:4007:816::2001
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: 24 ms
Got: 24 ms
A172.217.22.33
AAAA2a00:1450:4007:816::2001
CNAMEblogspot.l.googleusercontent.com
NS—
MX—
TXT—
CAALookup not available with standard resolver
Resolved in 24 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 172.217.22.33 does not match any cert SAN: fra15s16-in-f33.1e100.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 2a00:1450:4007:816::2001 does not match any cert SAN: par10s33-in-x01.1e100.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 824 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
REVIEW
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
26 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
17 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
26 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
735 ms
Total Time Total request time from DNS lookup through full response.
825 ms

Connection waterfall

DNS Lookup 26 ms TCP Connect 17 ms TLS Handshake 26 ms Server Processing 666 ms Content Transfer 90 ms
B
TLS Certificate Expiry & Recommendations
60 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

60
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
C
CDN & Delivery
Action
Assets on Cloudflare (host cdnjs.cloudflare.com, 3 assets); document served directly from origin (Google)
REVIEW
Assets on Cloudflare (host cdnjs.cloudflare.com, 3 assets); document served directly from origin (Google)
Warning::
Document not behind existing CDN (Cloudflare serves the assets)
The page's subresources are delivered by Cloudflare (cdnjs.cloudflare.com, 3 assets), but the HTML document itself comes straight from the origin (Google). Routing the document through the CDN already in use is the cheapest latency win available here -- the provider relationship, the certificate and the config already exist. A short edge TTL with stale-while-revalidate suits HTML that changes often; if the response is genuinely per-user, edge TLS termination alone still removes a full round trip from every visitor's first byte.
Got: cf-ray: a45671983fa7040b-CDG
Info::
Assets on Cloudflare: cdnjs.cloudflare.com (assets: 3), cache BYPASS
Got: cf-ray: a45671983fa7040b-CDG
Warning: Assets on a CDN, document is not: Cloudflare
Document origin Google

Asset hosts on a CDN

  • cdnjs.cloudflare.com — Cloudflare · assets: 3 · Cache Status: BYPASS

Other asset hosts

  • pagead2.googlesyndication.com — assets: 3 · Google
  • 1.bp.blogspot.com — assets: 2 · below probe threshold
  • fonts.googleapis.com — assets: 2 · below probe threshold
  • fundingchoicesmessages.google.com — assets: 2 · below probe threshold
  • beavercheck.com — assets: 1 · below probe threshold
  • lh3.googleusercontent.com — assets: 1 · below probe threshold
  • www.blogger.com — assets: 1 · below probe threshold
  • www.googletagmanager.com — assets: 1 · below probe threshold

The heavy static files already ride an edge network, but every visitor still waits on the origin for the HTML itself. Routing the document through the same CDN is usually a config change rather than a migration: a short edge TTL with stale-while-revalidate for cacheable HTML, or edge TLS termination alone when the response is per-user.

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 16ms across 3 resolvers (spread 27ms)
PASS
Mean 16ms across 3 resolvers (spread 27ms)
Info::
Quad9: 1ms
Got: 1ms via 9.9.9.9:53
Info::
Google: 20ms
Got: 20ms via 8.8.8.8:53
Info::
Cloudflare: 28ms
Got: 28ms 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://merpaticerita.blogspot.com

https://merpaticerita.blogspot.com

189 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://merpaticerita.blogspot.com200189 msHTTP/1.1GSE
A+
IPv6 Readiness
IPv6 reachable (17 ms)
PASS
IPv6 reachable (17 ms)
Info::
IPv6 is configured and reachable at 2a00:1450:4007:816::2001
Got: 17 ms connect
IPv6 Ready
AAAA Records 2a00:1450:4007:816::2001 Connection Reachable (17 ms)
A
Crawlability
robots.txt present, sitemap with 0 URLs
PASS
robots.txt present, sitemap with 0 URLs
Info::
robots.txt is present
Got: 187 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Warning::
sitemap.xml is empty — no URLs found
An empty sitemap provides no value. Add <url> entries for your pages.
Info::
robots.txt references sitemap

An empty sitemap provides no value. Add <url> entries for your pages.

Why this matters

An empty sitemap signals 'no content to index' to Google — actively harmful versus having no sitemap at all.

Learn more ▾

Google compares URLs in the sitemap against URLs it has crawled. An empty sitemap on a site with thousands of pages signals abandonment. Either populate it correctly (most CMSes auto-generate) or delete the file and let Google crawl normally.

Source: Google Search Central / sitemaps.org

robots.txt 200 OK
Size 187 B Sitemaps referenced 2 User-agents * Blocking No — crawling allowed
User-agent: * 
Disallow: /search 
Disallow: /category/ 
Disallow: /tag/ 
Allow: / 
Sitemap: https://merpaticerita.blogspot.com/rss.xml
Sitemap: https://merpaticerita.blogspot.com/atom.xml
sitemap.xml 200 OK
Type URL Set URLs 0 entries Valid XML Yes
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.merpaticerita.blogspot.com/
200https://merpaticerita.blogspot.com/

HTTP → HTTPS

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