`certifiedforlinux.cn`

DNSSEC	⚠️ Not signed
A	3.131.150.69^{🇺🇸 Amazon3.131.0.0/16 EC2 CMH prefix}
		PTR	`ec2-3-131-150-69.us-east-2.compute.amazonaws.com`
NS	`ns1.dnsimple.com` ⭐
		A	2400:cb00:2049:1::a29f:1804^{🇺🇸 Cloudflare2400:cb00:2049::/48 , Inc. 101 Townsend Street}
			PTR	`ns1.dnsimple.com`
		A	162.159.24.4^{Cloudflare162.159.24.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`ns1.dnsimple.com`
NS	`ns2.dnsimple.com`
		A	2620:111:8005::53^{🇺🇸 AS327712620:111:8005::/48 Vultr Customer Route}
		A	199.247.153.53^{🇺🇸 AS32771199.247.153.0/24 Vultr Customer Route}
NS	`ns3.dnsimple.com`
		A	2400:cb00:2049:1::a29f:1a04^{🇺🇸 Cloudflare2400:cb00:2049::/48 , Inc. 101 Townsend Street}
			PTR	`ns3.dnsimple.com`
		A	162.159.26.4^{Cloudflare162.159.26.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`ns3.dnsimple.com`
NS	`ns4.dnsimple.com`
		A	2620:111:8007::53^{🇺🇸 AS327712620:111:8007::/48 Vultr Customer Route}
		A	199.247.155.53^{🇺🇸 AS32771199.247.155.0/24 Vultr Customer Route}
MX	`smtp1.linuxfoundation.org` ⭐
MX	`smtp2.linuxfoundation.org`⁽¹⁵⁾
SOA	`ns1.dnsimple.com`admin@dnsimple.com serial=1557435321

`cn`

	DNSSEC	⚠️ Not signed
	NS	`a.dns.cn` ⭐ 🔒
	NS	`b.dns.cn`
	NS	`c.dns.cn` 🔒
	NS	`d.dns.cn` 🔒
	NS	`e.dns.cn` 🔒
	NS	`ns.cernet.net` ⚠️ Not in parent delegation
	SOA	`a.dns.cn`root@cnnic.cn serial=2034456417

DNS History

10 records (7 active, 3 former)

●NSns1.dnsimple.com2026-03-02 → 2026-03-02 · 3 obs

○ 2017-02-15 00:46:52
● 2026-03-02 05:56:54
● 2026-03-02 05:56:56

○NSns1.linux-foundation.org2015-06-28 → 2017-02-15 · 4 obs

● 2015-06-28 14:59:26
● 2017-02-15 00:46:52
○ 2026-03-02 05:56:54
○ 2026-03-02 05:56:56

●NSns2.dnsimple.com2026-03-02 → 2026-03-02 · 3 obs

○ 2017-02-15 00:46:52
● 2026-03-02 05:56:54
● 2026-03-02 05:56:56

○NSns2.linux-foundation.org2015-06-28 → 2017-02-15 · 4 obs

● 2015-06-28 14:59:26
● 2017-02-15 00:46:52
○ 2026-03-02 05:56:54
○ 2026-03-02 05:56:56

●NSns3.dnsimple.com2026-03-02 → 2026-03-02 · 3 obs

○ 2017-02-15 00:46:52
● 2026-03-02 05:56:54
● 2026-03-02 05:56:56

●NSns4.dnsimple.com2026-03-02 → 2026-03-02 · 3 obs

○ 2017-02-15 00:46:52
● 2026-03-02 05:56:54
● 2026-03-02 05:56:56

●MXsmtp1.linuxfoundation.org2015-06-28 → 2026-03-02 · 2 obs

● 2015-06-28 14:59:26
● 2026-03-02 05:56:56

●MXsmtp2.linuxfoundation.org2015-06-28 → 2026-03-02 · 2 obs

● 2015-06-28 14:59:26
● 2026-03-02 05:56:56

○A140.211.169.42015-06-28 → 2017-02-15 · 4 obs

● 2015-06-28 14:59:26
● 2017-02-15 00:46:52
○ 2026-03-02 05:56:54
○ 2026-03-02 05:56:56

●A3.131.150.692026-03-02 → 2026-03-02 · 3 obs

○ 2017-02-15 00:46:52
● 2026-03-02 05:56:54
● 2026-03-02 05:56:56

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cn	a.dns.cn, c.dns.cn, b.dns.cn, d.dns.cn...	-
certifiedforlinux.cn	ns1.dnsimple.com, ns2.dnsimple.com, ns3.dnsimple.com, ns4.dnsimple.com	-

✅ Authoritative Response

Server: 162.159.24.4

NS records: ns1.dnsimple.com, ns2.dnsimple.com, ns3.dnsimple.com, ns4.dnsimple.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for certifiedforlinux.cn (unsigned zone)

⏱️ Timing

Total: 1794ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`3.131.150.69`
NS	4	`ns1.dnsimple.com, ns2.dnsimple.com...`
MX	2	`smtp1.linuxfoundation.org (pri: 10), smtp2.linuxfoundation.org (pri: 15)`
SOA	1	`ns1.dnsimple.com admin.dnsimple.com`

Analysis

IP Addresses

certifiedforlinux.cn points to a single IP address: 3.131.150.69.

Other host names such as snapyhomes.com, totally-trustworthy-site-because-it-has-a-padlock.com, mail.danielwiener.net, blog.sourcery.us and rgfa.co.uk share IP numbers with certifiedforlinux.cn.

Name Servers

certifiedforlinux.cn is delegated to four name servers: ns1.dnsimple.com, ns2.dnsimple.com, ns3.dnsimple.com and ns4.dnsimple.com.

At least part of the name servers for certifiedforlinux.cn are shared with other domains, for instance hirefrederick.com, anthonydimeoportfolio.com, palaisdeflirt.com, sphero.com and andrewesmith.com.

These name servers are commonly used alongside ns4.dnsimple-edge.org and ns2.dnsimple-edge.net.

Host names with two IP numbers:

ns1.dnsimple.com points to: 2400:cb00:2049:1::a29f:1804 and 162.159.24.4

ns2.dnsimple.com points to: 2620:111:8005::53 and 199.247.153.53

ns3.dnsimple.com points to: 2400:cb00:2049:1::a29f:1a04 and 162.159.26.4

ns4.dnsimple.com points to: 2620:111:8007::53 and 199.247.155.53

Mail Servers

certifiedforlinux.cn is handled by two mail servers: smtp1.linuxfoundation.org and smtp2.linuxfoundation.org.

certifiedforlinux.cn uses the same mail server setup as other domains, for instance opena11y.net, envoyproxy.io, celinux.com, platform.linuxfoundation.org and embeddedlinuxconference.com.

certifiedforlinux.cn - robtex.com