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Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
99
GRADE
A+
FIX
0
REVIEW
1
PASS
8
INFO
0
Probed from Madrid, Spain
200 OK
Checks
9
8 PASS 1 REVIEW
B
TLS Certificate Expiry & Recommendations
84 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

84
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
2 A records, 32 ms lookup
PASS
2 A records, 32 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 104.18.43.9, 172.64.144.247
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2a06:98c1:3103::ac40:90f7, 2a06:98c1:310a::6812:2b09
Info::
2 nameserver(s) configured
Got: adel.ns.cloudflare.com, greg.ns.cloudflare.com
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: 32 ms
Got: 32 ms
A104.18.43.9, 172.64.144.247
AAAA2a06:98c1:3103::ac40:90f7, 2a06:98c1:310a::6812:2b09
CNAME—
NSadel.ns.cloudflare.com, greg.ns.cloudflare.com
MX
1 aspmx.l.google.com
5 alt1.aspmx.l.google.com
5 alt2.aspmx.l.google.com
10 alt3.aspmx.l.google.com
10 alt4.aspmx.l.google.com
TXT
SPF v=spf1 include:mailgun.org include:_spf.google.com ~all
google-site-verification=HleifaPPjTRtPQdvU3CPX_v-ILWa7hrmpWS8E5vRDIw
F324B508E9
google-site-verification=iRJ8V6RAGqoNfFwiuPPdHkg_t4lLooctR2kaqzr6xIw
CAALookup not available with standard resolver
Resolved in 32 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://codesandbox.io

https://codesandbox.io

103 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://codesandbox.io200103 msHTTP/1.1cloudflare
A+
IPv6 Readiness
IPv6 reachable (17 ms)
PASS
IPv6 reachable (17 ms)
Info::
IPv6 is configured and reachable at 2a06:98c1:3103::ac40:90f7, 2a06:98c1:310a::6812:2b09
Got: 17 ms connect
IPv6 Ready
AAAA Records 2a06:98c1:3103::ac40:90f7, 2a06:98c1:310a::6812:2b09 Connection Reachable (17 ms)
A+
Crawlability
robots.txt present, sitemap with 1 URLs
PASS
robots.txt present, sitemap with 1 URLs
Info::
robots.txt is present
Got: 22 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 1 entries
Info::
Sitemap index with 1 child sitemaps
Info::
robots.txt does not reference a sitemap
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

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 22 B Sitemaps referenced 0 User-agents * Blocking No — crawling allowed
User-agent: *
Allow: /
sitemap.xml 200 OK
Type Sitemap Index URLs 1 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.codesandbox.io/
200https://codesandbox.io/

Preferred variant: non-www

HTTP → HTTPS

301http://codesandbox.io/ → https://codesandbox.io/

Consistent

A+
Domain Intelligence
codesandbox.io — via NameCheap, Inc., 9 years, 6 months old
PASS
codesandbox.io — via NameCheap, Inc., 9 years, 6 months old
Info::
Domain registered until Nov 23, 2029 (3 years, 8 months remaining)
Info::
Registrar: NameCheap, Inc.
Domain expiry

1230 days

November 23, 2029

SSL certificate

84 days

Issued by Let's Encrypt

Domain age

9 years, 6 months

Registered November 23, 2016

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

Unknown

2a06:98c1:310a::6812:2b09

Registrar

NameCheap, Inc.

Lock status unknown 2 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Registrar NameCheap, Inc.
Created November 23, 2016 (9 years, 6 months ago)
Expires November 23, 2029 (3 years, 8 months)
Last Updated October 26, 2020
Name Servers greg.ns.cloudflare.com, adel.ns.cloudflare.com
Registrant Privacy service provided by Withheld for Privacy ehf
Hosting
IP Address 2a06:98c1:310a::6812:2b09
Data source: whois (5.3s)
A+
HTTP Probe Timing
Total 160 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
31 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
16 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
24 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
155 ms
Total Time Total request time from DNS lookup through full response.
160 ms

Connection waterfall

DNS Lookup 31 ms TCP Connect 16 ms TLS Handshake 24 ms Server Processing 84 ms Content Transfer 5 ms
A
CDN & Delivery
Cloudflare (DYNAMIC)
PASS
Cloudflare (DYNAMIC)
Info::
Site is served via Cloudflare CDN (edge: CDG)
Got: cf-ray: 9e8bc6f8ab4d3d01-CDG
Info::
CDN cache status: DYNAMIC
CDN Detected: Cloudflare
Provider Cloudflare Cache Status DYNAMIC Evidence cf-ray: 9e8bc6f8ab4d3d01-CDG
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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