Domain lookup
ck12.org
Hosted by Amazon.com, Inc. (AS16509) in United States · Tranco rank #20,357 · 🇫🇷 Top 100K in France · registered 2006
Hosting
2600:9000:276c:4000:19:965:db40:93a1AS16509 Amazon.com, Inc. · 🇺🇸 United States · —
2600:9000:276c:6000:19:965:db40:93a1AS16509 Amazon.com, Inc. · 🇺🇸 United States · —
2600:9000:276c:7200:19:965:db40:93a1AS16509 Amazon.com, Inc. · 🇺🇸 United States · —
2600:9000:276c:b000:19:965:db40:93a1AS16509 Amazon.com, Inc. · 🇺🇸 United States · —
2600:9000:276c:bc00:19:965:db40:93a1AS16509 Amazon.com, Inc. · 🇺🇸 United States · —
2600:9000:276c:ea00:19:965:db40:93a1AS16509 Amazon.com, Inc. · 🇺🇸 United States · —
2600:9000:276c:f000:19:965:db40:93a1AS16509 Amazon.com, Inc. · 🇺🇸 United States · —
2600:9000:276c:f800:19:965:db40:93a1AS16509 Amazon.com, Inc. · 🇺🇸 United States · —
3.166.49.37AS16509 Amazon.com, Inc. · 🇺🇸 United States · Clean
3.166.49.5AS16509 Amazon.com, Inc. · 🇺🇸 United States · Clean
3.166.49.66AS16509 Amazon.com, Inc. · 🇺🇸 United States · Clean
3.166.49.93AS16509 Amazon.com, Inc. · 🇺🇸 United States · Clean
Technologies
Web serverAmazon
CDN / protectionAmazon CloudFront
ProtocolTLS 1.3 · HTTP/3
Security headersHSTS CSP Frame protection nosniff Referrer-Policy
SourceHome page probe · 4 Oct 2026 · statistics · about this probe
DNS records
Name serversAmazon Route 53
ns-1136.awsdns-14.org
ns-161.awsdns-20.com
ns-1687.awsdns-18.co.uk
ns-977.awsdns-58.net
ns-1136.awsdns-14.org
ns-161.awsdns-20.com
ns-1687.awsdns-18.co.uk
ns-977.awsdns-58.net
Mail serversGoogle
10 aspmx.l.google.com
30 alt1.aspmx.l.google.com
30 alt2.aspmx.l.google.com
50 aspmx2.aspmx.l.google.com
50 aspmx4.aspmx.l.google.com
50 aspmx5.aspmx.l.google.com
50 mail.ck12.org
10 aspmx.l.google.com
30 alt1.aspmx.l.google.com
30 alt2.aspmx.l.google.com
50 aspmx2.aspmx.l.google.com
50 aspmx4.aspmx.l.google.com
50 aspmx5.aspmx.l.google.com
50 mail.ck12.org
SPFv=spf1 ip4:174.129.252.43 ip4:63.236.100.0/24 ip4:66.77.16.0/24 include:emsd1.com include:amazonses.com include:_spf.google.com include:mail.zendesk.com -all
DMARCv=DMARC1; p=reject; pct=100; rua=mailto:dmarc-reports@ck12.org; ruf=mailto:dmarc-reports@ck12.org; adkim=s; aspf=s
Registration
RegistrarAmazon Registrar, Inc. (IANA #468)
Created2006-12-16 · 19 years ago
Expires2028-12-16 · in 2 years
Last changed2026-08-12
Statustransfer locked
DNSSECsigned
SourceRDAP · rdap.publicinterestregistry.org
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Known domains: the Tranco top 1M (most popular sites worldwide), the sites most visited in 238 countries (Chrome UX Report), every active .fr domain (AFNIC open data), every .nu, .ee, .se, .ch, .li, .sk domain (registry zone files), every domain of 1039 generic TLDs such as .org, .pro, .cloud (ICANN CZDS zone files) and domains seen in new certificates (Certificate Transparency logs, .com and .net included, collected since 30 September 2026), resolved regularly — updated continuously, last update 2026-10-10. Not exhaustive: other sites may share this address.
From our weekly resolution of the Tranco top 1M (last run 2026-10-03). JSON: /domain/ck12.org?format=json