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Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
93
GRADE
A
FIX
0
REVIEW
3
PASS
6
INFO
0
Probed from Sao Paulo, Brazil
200 OK
Checks
9
6 PASS 3 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
HTTP Probe Timing
Total 1144 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
REVIEW
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
12 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.
4 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
595 ms
Total Time Total request time from DNS lookup through full response.
1.14 s

Connection waterfall

DNS Lookup 12 ms TCP Connect 1 ms TLS Handshake 4 ms Server Processing 578 ms Content Transfer 549 ms
B
TLS Certificate Expiry & Recommendations
180 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

180
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
4 A records, 10 ms lookup
PASS
4 A records, 10 ms lookup
Info::
Resolves to 4 IPv4 address(es)
Got: 18.67.145.74, 18.67.145.99, 18.67.145.6, 18.67.145.24
Info::
No IPv6 (AAAA) records
Info::
4 nameserver(s) configured
Got: ns-1287.awsdns-32.org, ns-163.awsdns-20.com, ns-1638.awsdns-12.co.uk, ns-953.awsdns-55.net
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
A18.67.145.74, 18.67.145.99, 18.67.145.6, 18.67.145.24
AAAA—
CNAME—
NSns-1287.awsdns-32.org, ns-163.awsdns-20.com, ns-1638.awsdns-12.co.uk, ns-953.awsdns-55.net
MX
1 aspmx.l.google.com
5 alt1.aspmx.l.google.com
5 alt2.aspmx.l.google.com
10 alt4.aspmx.l.google.com
10 alt3.aspmx.l.google.com
TXT
facebook-domain-verification=fz49z7zr0ycqj7f9qvli45x3wqzfrh
google-site-verification=Kldj7OgchCyGYVHwynlh6tOmYdmPHPVno2VxUNeW0TI
SPF v=spf1 include:_spf.google.com a:mkto-mailer.jetbrains.com -all
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
No redirects — direct access
PASS
No redirects — direct access
Info::
No redirects — direct access
Got: https://kotlinlang.org

https://kotlinlang.org

623 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://kotlinlang.org200623 msHTTP/1.1AmazonS3
A+
Crawlability
robots.txt present, sitemap with 9 URLs
PASS
robots.txt present, sitemap with 9 URLs
Info::
robots.txt is present
Got: 97 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 9 entries
Info::
Sitemap index with 9 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 97 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
User-agent: *
Host: kotlinlang.org

# Sitemaps
sitemap: https://kotlinlang.org/sitemap_index.xml
sitemap.xml 200 OK
Type Sitemap Index URLs 9 entries Valid XML Yes
Child Sitemaps:
A+
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
PASS
www/non-www, trailing slash, HTTP→HTTPS
Info::
www/non-www redirect configured correctly (preferred: non-www)
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

301https://www.kotlinlang.org/
200https://kotlinlang.org/

Preferred variant: non-www

HTTP → HTTPS

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

Consistent

A+
Domain Intelligence
kotlinlang.org — via Squarespace Domains II LLC, 12 years, 8 months old, hosted on AWS
PASS
kotlinlang.org — via Squarespace Domains II LLC, 12 years, 8 months old, hosted on AWS
Info::
Domain registered until Sep 30, 2026 (5 months remaining)
Info::
DNSSEC is not enabled
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
Info::
Registrar: Squarespace Domains II LLC
Info::
Hosting: AWS
Got: AS16509
Domain expiry

80 days

September 30, 2026

SSL certificate

180 days

Issued by Amazon

Domain age

12 years, 8 months

Registered September 30, 2013

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

AWS

ASN AS16509

18.67.145.6

Registrar

Squarespace Domains II LLC

Lock status unknown 4 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Renew the domain or enable auto-renewal to prevent accidental expiry
  • Enable DNSSEC to protect visitors from DNS spoofing
Registrar Squarespace Domains II LLC
Created September 30, 2013 (12 years, 8 months ago)
Expires September 30, 2026 (5 months)
Last Updated September 22, 2025
Name Servers ns-1287.awsdns-32.org, ns-163.awsdns-20.com, ns-1638.awsdns-12.co.uk, ns-953.awsdns-55.net
DNSSEC Not enabled
Hosting
IP Address 18.67.145.6
ASN AS16509 (AMAZON-02 - Amazon.com, Inc., US)
Provider AWS
Data source: rdap (0.4s)

DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.

Why this matters

Without DNSSEC, an attacker who can poison your DNS can hijack your domain — and SSL certs alone don't stop them.

Learn more ▾

DNSSEC adds cryptographic signatures to DNS records, preventing forged responses from poisoning resolver caches. Without it, an attacker who controls the network path can redirect your domain to a malicious server before any HTTPS handshake happens. Most modern registrars (Cloudflare, Google Domains, Route 53) enable it with one toggle.

Source: ICANN / RFC 4033

A
CDN & Delivery
AWS CloudFront (Miss from cloudfront)
PASS
AWS CloudFront (Miss from cloudfront)
Info::
Site is served via AWS CloudFront CDN (edge: GRU1-P2)
Got: x-amz-cf-id: 5Wxh4PPRR3f6oXCCgeVBgR2p_XAzRl4vn76XPZyh5hot0fZZQV1fpA==
Info::
CDN cache status: Miss from cloudfront
CDN Detected: AWS CloudFront
Provider AWS CloudFront Cache Status Miss from cloudfront Evidence x-amz-cf-id: 5Wxh4PPRR3f6oXCCgeVBgR2p_XAzRl4vn76XPZyh5hot0fZZQV1fpA==
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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