🛡️Domain Reputation CheckBlocklist, phishing & malware status→

`certifyforlinux.com`

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-edge.com` ⭐
		A	2620:111:8004::53^{🇺🇸 AS327712620:111:8004::/48 DNSimple Corporation}
		A	199.247.152.53^{🇺🇸 AS32771199.247.152.0/24 DNSimple Corporation}
NS	`ns2.dnsimple-edge.net`
		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-edge.io`
		A	2620:111:8006::53^{🇺🇸 AS327712620:111:8006::/48 DNSimple Corporation}
		A	199.247.154.53^{🇺🇸 AS32771199.247.154.0/24 DNSimple Corporation}
NS	`ns4.dnsimple-edge.org`
		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-edge.com`admin@dnsimple.com serial=1557508446

`com`

	DNSSEC	⚠️ Not signed
	NS	`a.gtld-servers.net` ⭐
	NS	`b.gtld-servers.net`
	NS	`c.gtld-servers.net`
	NS	`d.gtld-servers.net`
	NS	`e.gtld-servers.net`
	NS	`f.gtld-servers.net`
	NS	`g.gtld-servers.net`
	NS	`h.gtld-servers.net`
	NS	`i.gtld-servers.net`
	NS	`j.gtld-servers.net`
	NS	`k.gtld-servers.net`
	NS	`l.gtld-servers.net`
	NS	`m.gtld-servers.net`
	SOA	`a.gtld-servers.net`nstld@verisign-grs.com serial=1794477996

Same first word

certifyforlinux.com

certifyforlinux.biz

certifyforlinux.org

certifyforlinux.info

certifyforlinux.net

Previous names

Next names

DNS History

15 records (7 active, 8 former)

●NSns1.dnsimple-edge.com2026-09-14 → 2026-11-12 · 3 obs

○ 2020-01-13 19:39:16
● 2026-09-14 15:41:20
● 2026-11-12 10:25:14

○NSns1.dnsimple.com2020-01-13 → 2020-01-13 · 4 obs

○ 2017-02-15 06:51:04
● 2020-01-13 19:39:16
○ 2026-09-14 15:41:20
○ 2026-11-12 10:25:14

○NSns1.linux-foundation.org2015-07-19 → 2017-02-15 · 4 obs

● 2015-07-19 03:09:30
● 2017-02-15 06:51:04
○ 2020-01-13 19:39:16
○ 2026-11-12 10:25:14

●NSns2.dnsimple-edge.net2026-09-14 → 2026-11-12 · 3 obs

○ 2020-01-13 19:39:16
● 2026-09-14 15:41:20
● 2026-11-12 10:25:14

○NSns2.dnsimple.com2020-01-13 → 2020-01-13 · 4 obs

○ 2017-02-15 06:51:04
● 2020-01-13 19:39:16
○ 2026-09-14 15:41:20
○ 2026-11-12 10:25:14

○NSns2.linux-foundation.org2015-07-19 → 2017-02-15 · 4 obs

● 2015-07-19 03:09:30
● 2017-02-15 06:51:04
○ 2020-01-13 19:39:16
○ 2026-11-12 10:25:14

●NSns3.dnsimple-edge.io2026-09-14 → 2026-11-12 · 3 obs

○ 2020-01-13 19:39:16
● 2026-09-14 15:41:20
● 2026-11-12 10:25:14

○NSns3.dnsimple.com2020-01-13 → 2020-01-13 · 4 obs

○ 2017-02-15 06:51:04
● 2020-01-13 19:39:16
○ 2026-09-14 15:41:20
○ 2026-11-12 10:25:14

●NSns4.dnsimple-edge.org2026-09-14 → 2026-11-12 · 3 obs

○ 2020-01-13 19:39:16
● 2026-09-14 15:41:20
● 2026-11-12 10:25:14

○NSns4.dnsimple.com2020-01-13 → 2020-01-13 · 4 obs

○ 2017-02-15 06:51:04
● 2020-01-13 19:39:16
○ 2026-09-14 15:41:20
○ 2026-11-12 10:25:14

●MXsmtp1.linuxfoundation.org2015-07-19 → 2026-11-12 · 2 obs

● 2015-07-19 03:09:30
● 2026-11-12 10:25:14

●MXsmtp2.linuxfoundation.org2015-07-19 → 2026-11-12 · 2 obs

● 2015-07-19 03:09:30
● 2026-11-12 10:25:14

○A140.211.169.42015-07-19 → 2017-02-15 · 4 obs

● 2015-07-19 03:09:30
● 2017-02-15 06:51:04
○ 2020-01-13 19:39:16
○ 2026-11-12 10:25:14

○A3.13.31.2142020-01-13 → 2020-01-13 · 4 obs

○ 2017-02-15 06:51:04
● 2020-01-13 19:39:16
○ 2026-09-14 15:41:20
○ 2026-11-12 10:25:14

●A3.131.150.692026-09-14 → 2026-11-12 · 3 obs

○ 2020-01-13 19:39:16
● 2026-09-14 15:41:20
● 2026-11-12 10:25:14

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
certifyforlinux.com	ns4.dnsimple-edge.org, ns2.dnsimple-edge.net, ns3.dnsimple-edge.io, ns1.dnsimple-edge.com	2 records

✅ Authoritative Response

Server:199.247.155.53

NS records: ns4.dnsimple-edge.org, ns2.dnsimple-edge.net, ns3.dnsimple-edge.io, ns1.dnsimple-edge.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for certifyforlinux.com (unsigned zone)

⏱️ Timing

Total: 1544ms | Queries: -

📄 Records

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

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns1.dnsimple-edge.com, ns1.dnsimple-edge.com)

Analysis

IP Addresses

certifyforlinux.com has exactly one IP address — 3.131.150.69.

scottjohnstoncartoons.com, gethygraphtechnology.com, thunderbirdcoaching.info plus two other host names have IP numbers in common with certifyforlinux.com.

Name Servers

Four name servers handle the delegation for certifyforlinux.com: ns1.dnsimple-edge.com, ns3.dnsimple-edge.io, ns2.dnsimple-edge.net and ns4.dnsimple-edge.org.

At least some of certifyforlinux.com's name servers are shared with other domains, for example triconium.com, dsatrackandfieldcamps.com, closingdealssecrets.com and two more.

These name servers tend to be deployed in combination with the name servers ns1.dnsimple.com and ns3.dnsimple.com.

Four hostnames, each resolving to a pair of IP addresses: ns1.dnsimple-edge.com directs to 199.247.152.53 and 2620:111:8004::53; ns3.dnsimple-edge.io directs to 199.247.154.53 and 2620:111:8006::53; ns2.dnsimple-edge.net directs to 199.247.153.53 and 2620:111:8005::53; ns4.dnsimple-edge.org directs to 199.247.155.53 and 2620:111:8007::53.

Mail Servers

certifyforlinux.com uses two mail servers, smtp1.linuxfoundation.org and smtp2.linuxfoundation.org.

The mail server setup of certifyforlinux.com matches that of other domains such as linuxstandardsbase.info, linuxstandardbase.com, fossbazaar.info and two others.

At least some of the mail servers used by certifyforlinux.com are shared with other domains: fossbazaar.com, linuxstandardbase.info, apistrat.com and two others among them.

certifyforlinux.com - robtex.com