Skip to content
https://blockchain.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 Santa Clara, United States
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.blockchain.com/
200https://blockchain.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://blockchain.com/ → https://www.blockchain.com/

Consistent

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

Certificate validity

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

Recommended actions

  • Submit your domain to hstspreload.org to be added to the Chrome preload list
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
B
CDN & Delivery
Cloudflare
REVIEW
Cloudflare
Info::
Site is served via Cloudflare CDN (edge: SJC)
Got: cf-ray: 9f07606f9d269ac2-SJC
CDN Detected: Cloudflare
Provider Cloudflare Evidence cf-ray: 9f07606f9d269ac2-SJC
A+
DNS Records
2 A records, 10 ms lookup
PASS
2 A records, 10 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 104.17.173.30, 104.17.172.30
Info::
No IPv6 (AAAA) records
Info::
2 nameserver(s) configured
Got: jay.ns.cloudflare.com, beth.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: 10 ms
Got: 10 ms
A104.17.173.30, 104.17.172.30
AAAA—
CNAME—
NSjay.ns.cloudflare.com, beth.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
OSSRH-58722
MS=ms61322212
CKO=cli_qfirt6xy4yiundv3a2jpeyvhaq
apple-domain-verification=m90cSpCL7VE0zDvo
MS=150421F564D39B22149A3F2E6E874413D0D4836F
docusign=2707bdc5-ce07-4b5c-85d6-622c728ede8a
FIO82JrXaaVmRsuJrm5yD4iim5fuarfNYYCP9bcZrL7gfRCtTzRun
openai-domain-verification=dv-RwBr61oCEqK8toOpQTVpxuzK
segment-site-verification=aWKh9paGnJTlTgOFWdN1BiCiD3GTYobl
anthropic-domain-verification-0w6gyp=zwHjPHf7RURYDef1PaQSMROtB
google-site-verification=Bs2i_i9ZGs4Xo4Rjh4GHqNglIZEY7Im-Vvp4QDRfwHo
notion-domain-verification=lQGUrwdKWe04PuLDcRG5idcidJLOi29pJmPniJUhKMN
stripe-verification=69E3ACD21AEF8B8244BAC9464BB2856F14C4B3998D4808E5328B51940A19...
atlassian-domain-verification=3Nau9JDz9R67dqvzkIEpQsriloeNPy4vI/eh5acyDnEsG255AN...
wallet-connect-dns-verification=e082715301de4a99085914d51b7d616b1260868f6b93e47e...
SPF v=spf1 include:sendgrid.net include:_spf.google.com include:mail.zendesk.com inc...
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), 128 ms total
PASS
1 redirect(s), 128 ms total
Info::
Single redirect
Got: https://blockchain.com → https://www.blockchain.com/ (301)
Info::
WWW normalization redirect

https://blockchain.com

35 ms · HTTP/1.1

301

https://www.blockchain.com/

94 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://blockchain.com30135 msHTTP/1.1cloudflare
2https://www.blockchain.com/20094 msHTTP/1.1cloudflare

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 117 URLs
PASS
robots.txt present, sitemap with 117 URLs
Info::
robots.txt is present
Got: 498 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 117 entries
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 498 B Sitemaps referenced 1 User-agents *, proximic Blocking No — crawling allowed
User-Agent: *

Allow: /sitemap.xml
Allow: /blockchain_sitemap_01.xml
Allow: /blockchain_sitemap_02.xml
Allow: /blockchain_sitemap_03.xml
Allow: /blockchain_sitemap_04.xml
Allow: /blockchain_sitemap_05.xml
Allow: /.well-known/assetlinks.json
Allow: /.well-known/apple-app-site-association

Disallow: /search
Disallow: /*/search
Disallow: /*/block-index/*
Disallow: /*/tx-index/*
Disallow: /r?*
Disallow: /static/*.pdf

Sitemap: https://www.blockchain.com/sitemap.xml

User-agent: proximic
Disallow:
sitemap.xml 200 OK
Type URL Set URLs 117 entries Valid XML Yes
Sample URLs:
A+
Domain Intelligence
blockchain.com — via Cloudflare, Inc., 15 years, 4 months old, hosted on Cloudflare
PASS
blockchain.com — via Cloudflare, Inc., 15 years, 4 months old, hosted on Cloudflare
Info::
Domain registered until Mar 8, 2027 (10 months remaining)
Info::
DNSSEC is enabled
Info::
Registrar: Cloudflare, Inc.
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: Cloudflare
Got: AS13335
Domain expiry

234 days

March 8, 2027

SSL certificate

60 days

Issued by Google Trust Services

Domain age

15 years, 4 months

Registered March 8, 2011

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

Cloudflare

ASN AS13335

104.17.173.30

Registrar

Cloudflare, Inc.

Unlocked 2 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 Cloudflare, Inc.
Created March 8, 2011 (15 years, 4 months ago)
Expires March 8, 2027 (10 months)
Last Updated December 8, 2025
Name Servers beth.ns.cloudflare.com, jay.ns.cloudflare.com
DNSSEC Enabled
Hosting
IP Address 104.17.173.30
ASN AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)
Provider Cloudflare
Data source: rdap (0.1s)

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 25 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
5 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
2 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
7 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
25 ms
Total Time Total request time from DNS lookup through full response.
25 ms

Connection waterfall

DNS Lookup 5 ms TCP Connect 2 ms TLS Handshake 7 ms Server Processing 10 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.

Send Feedback