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https://flipsnack.com

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
87
GRADE
B
FIX
0
REVIEW
4
PASS
5
INFO
0
Probed from Amsterdam, Netherlands
301 Moved Permanently
Checks
9
5 PASS 4 REVIEW
C
IPv6 Readiness
Action
No IPv6 support
REVIEW
No IPv6 support
Info::
No IPv6 (AAAA) records found
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No IPv6 Support
About 40% of internet users have IPv6. Consider adding AAAA records.

IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.

Why this matters

No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.

Source: Google IPv6 stats

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.flipsnack.com/
200https://flipsnack.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://flipsnack.com/ → https://flipsnack.com/

Consistent

B
TLS Certificate Expiry & Recommendations
176 days until leaf cert expires — 2 issues to address
REVIEW

Certificate validity

176
days left
0d 30d 60d 90d+

Recommended actions

  • Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
B
CDN & Delivery
AWS CloudFront (FunctionGeneratedResponse from cloudfront)
REVIEW
AWS CloudFront (FunctionGeneratedResponse from cloudfront)
Info::
Site is served via AWS CloudFront CDN (edge: AMS56-P1)
Got: x-amz-cf-id: ttUXo4kn8ayNeZs1VfeXAoetfKyF17cUzdqGr5Ff-vlR63wRvtnsgQ==
Info::
CDN cache status: FunctionGeneratedResponse from cloudfront
CDN Detected: AWS CloudFront
Provider AWS CloudFront Cache Status FunctionGeneratedResponse from cloudfront Evidence x-amz-cf-id: ttUXo4kn8ayNeZs1VfeXAoetfKyF17cUzdqGr5Ff-vlR63wRvtnsgQ==
A+
DNS Records
4 A records, 10 ms lookup
PASS
4 A records, 10 ms lookup
Info::
Resolves to 4 IPv4 address(es)
Got: 3.173.161.58, 3.173.161.111, 3.173.161.114, 3.173.161.98
Info::
No IPv6 (AAAA) records
Info::
4 nameserver(s) configured
Got: ns-249.awsdns-31.com, ns-788.awsdns-34.net, ns-1438.awsdns-51.org, ns-1616.awsdns-10.co.uk
Info::
5 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: 10 ms
Got: 10 ms
A3.173.161.58, 3.173.161.111, 3.173.161.114, 3.173.161.98
AAAA—
CNAME—
NSns-249.awsdns-31.com, ns-788.awsdns-34.net, ns-1438.awsdns-51.org, ns-1616.awsdns-10.co.uk
MX
1 aspmx.l.google.com
5 alt2.aspmx.l.google.com
5 alt1.aspmx.l.google.com
10 aspmx3.googlemail.com
10 aspmx2.googlemail.com
TXT
apple-domain-verification=S0sL2nCA7arijWkI
openai-domain-verification=dv-emiMlgQop783eZXxJOPDRn79
cursor-domain-verification-y15gqp=0xKbCvJF6mhmuIrk9h1hBUv5r
IR-a07099f375f1c29a85a4dbb7ff5b33f1c3c9551fd0e3231668f5d683438d36fd
yahoo-verification-key=sWSp9U0QFJHyuQpjusLtRLdP8DFdshSORm0ycI6pGC8=
google-site-verification=8lFEMY1WLJiYuwegDcpkIVqtVkPm4Th0YllNh7lnC1U
hubspot-developer-verification=YjhlNzY5MDktNzVlYS00MzY4LTg5ODItYjQwOTc2ZmNmZDNh
stripe-verification=332a33725f0ab13f7d93bb5cbedf3cc7110b44354bafc4a4309ce02e30fd...
stripe-verification=78f155fe74717808b1632616409b6e476d616937a0dd2ed8b73277af2158...
stripe-verification=f22763534d7f8b97ba3ec56a9308f146602b7230f47e05ad9cfc3eb23795...
atlassian-domain-verification=3nFPsn/DylBEZpxF1fqsS9TaHvg/f9Jiemu0TM0XE5r4gCcoCi...
SPF v=spf1 include:amazonses.com include:_spf.google.com include:_spf.mailgun.org in...
CAALookup not available with standard resolver
Resolved in 10 ms

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), 72 ms total
PASS
1 redirect(s), 72 ms total
Info::
Single redirect
Got: https://flipsnack.com → https://www.flipsnack.com/ (301)
Info::
WWW normalization redirect

https://flipsnack.com

39 ms · HTTP/1.1

301

https://www.flipsnack.com/

33 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://flipsnack.com30139 msHTTP/1.1CloudFront
2https://www.flipsnack.com/20033 msHTTP/1.1FlipsnackServer

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 109 URLs
PASS
robots.txt present, sitemap with 109 URLs
Info::
robots.txt is present
Got: 443 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 109 entries
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 443 B Sitemaps referenced 3 User-agents * Blocking No — crawling allowed
User-agent: *
Disallow: /admin/
Disallow: /controllers/
Disallow: /crons/
Disallow: /css/
Disallow: /config/
Disallow: /include/
Disallow: /templates_c/
Disallow: /my-account/
Disallow: /my-flipbooks/
Disallow: /myaccount/
Disallow: /flip-preview/
Disallow: /api/
Disallow: /app/

Sitemap: https://www.flipsnack.com/sitemap_site.xml
Sitemap: https://www.flipsnack.com/sitemap_templates.xml
Sitemap: https://www.flipsnack.com/sitemap_video.xml
sitemap.xml 200 OK
Type URL Set URLs 109 entries Valid XML Yes
Sample URLs:
A+
Domain Intelligence
flipsnack.com — via GoDaddy.com, LLC, 16 years, 1 months old, hosted on AWS
PASS
flipsnack.com — via GoDaddy.com, LLC, 16 years, 1 months old, hosted on AWS
Info::
Domain registered until Jun 3, 2030 (4 years, 2 months remaining)
Info::
DNSSEC is enabled
Info::
Registrar: GoDaddy.com, LLC
Warning::
Registrar lock is NOT enabled
The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.
Info::
Hosting: AWS
Got: AS16509
Domain expiry

1448 days

June 3, 2030

SSL certificate

176 days

Issued by Amazon

Domain age

16 years, 1 months

Registered June 3, 2010

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

AWS

ASN AS16509

3.173.161.58

Registrar

GoDaddy.com, LLC

Unlocked 4 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar GoDaddy.com, LLC
Created June 3, 2010 (16 years, 1 months ago)
Expires June 3, 2030 (4 years, 2 months)
Last Updated February 11, 2026
Name Servers ns-1438.awsdns-51.org, ns-1616.awsdns-10.co.uk, ns-249.awsdns-31.com, ns-788.awsdns-34.net
DNSSEC Enabled
Hosting
IP Address 3.173.161.58
ASN AS16509 (AMAZON-02 - Amazon.com, Inc., US)
Provider AWS
Data source: rdap (0.3s)

The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.

Why this matters

Without registrar lock, an attacker who phishes your registrar credentials can transfer the domain in minutes — total brand hijack.

Learn more ▾

Registrar lock (clientTransferProhibited, clientUpdateProhibited, clientDeleteProhibited) requires extra verification before any transfer/update/delete. Every major registrar offers it free. Combined with 2FA on your registrar account, it's the strongest defense against domain hijacking.

Source: ICANN / domain-security best practice

A+
HTTP Probe Timing
Total 20 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
10 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.
20 ms
Total Time Total request time from DNS lookup through full response.
21 ms

Connection waterfall

DNS Lookup 10 ms TCP Connect 1 ms TLS Handshake 5 ms Server Processing 4 ms Content Transfer 0 ms
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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