`cortex-development.com`

DNSSEC	⚠️ Not signed
A	213.239.215.241^{Hetzner213.239.192.0/18 HETZNER-RZ-NBG-BLK2}
NS	`ns1.first-ns.de` ⭐
		A	2a01:4f8:0:a101::a:1^{🇩🇪 Hetzner2a01:4f8::/32 HETZNER-IPv6-BLK}
			PTR	`ns1.first-ns.de`
		A	213.239.242.238^{🇩🇪 Hetzner213.239.192.0/18 HETZNER-RZ-NBG-BLK2}
			PTR	`ns1.first-ns.de`
NS	`robotns2.second-ns.de`
		A	2a01:4f8:0:1::5ddc:2^{🇩🇪 Hetzner2a01:4f8::/32 HETZNER-IPv6-BLK}
			PTR	`robotns2.second-ns.de`
		A	213.133.100.103^{🇩🇪 Hetzner213.133.96.0/19 HETZNER-RZ-NBG-BLK1}
			PTR	`robotns2.second-ns.de`
NS	`robotns3.second-ns.com`
		A	2001:67c:192c::add:a3^{🇩🇪 NORIS-NETWORK2001:67c:192c::/48}
			PTR	`robotns3.second-ns.com`
		A	193.47.99.3^{🇩🇪 NORIS-NETWORK193.47.99.0/24}
			PTR	`robotns3.second-ns.com`
MX	`mail.cortex-development.com` ⭐
TXT	`v=spf1 mx mx:cortex2.nebelhauch.de -all`
SOA	`ns1.first-ns.de`dns@hetzner.com 2026-04-14 #0

`com`

	DNSSEC	🔒 Signed (DS record present)
	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=1783398756

Subdomains

mail.cortex-development.com

Same first word

cortex-development.com

DNS History

5 records (5 active, 0 former)

●NSns1.first-ns.de2015-07-08 → 2026-07-07 · 2 obs

● 2015-07-08 18:09:00
● 2026-07-07 04:33:04

●NSrobotns2.second-ns.de2015-07-08 → 2026-07-07 · 2 obs

● 2015-07-08 18:09:00
● 2026-07-07 04:33:04

●NSrobotns3.second-ns.com2015-07-08 → 2026-07-07 · 2 obs

● 2015-07-08 18:09:00
● 2026-07-07 04:33:04

●MXmail.cortex-development.com2015-07-08 → 2026-07-07 · 2 obs

● 2015-07-08 18:09:00
● 2026-07-07 04:33:04

●A213.239.215.2412015-07-08 → 2026-07-07 · 2 obs

● 2015-07-08 18:09:00
● 2026-07-07 04:33:04

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	h.gtld-servers.net, f.gtld-servers.net, a.gtld-servers.net, d.gtld-servers.net...	-
cortex-development.com	ns1.first-ns.de, robotns2.second-ns.de, robotns3.second-ns.com	2 records

✅ Authoritative Response

Server:213.239.242.238

NS records: ns1.first-ns.de, robotns2.second-ns.de, robotns3.second-ns.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for cortex-development.com (unsigned zone)

⏱️ Timing

Total: 1844ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`213.239.215.241`
NS	3	`robotns3.second-ns.com, ns1.first-ns.de...`
MX	1	`mail.cortex-development.com (pri: 10)`
TXT	1	`v=spf1 mx mx:cortex2.nebelhauch.de -all`
SOA	1	`ns1.first-ns.de dns.hetzner.com`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (robotns3.second-ns.com, robotns3.second-ns.com)

Analysis

Hierarchy

cortex-development.com serves as the parent of mail.cortex-development.com.

IP Addresses

cortex-development.com resolves to one IP address: 213.239.215.241.

Name Servers

Three name servers are authoritative for cortex-development.com: robotns3.second-ns.com, ns1.first-ns.de and robotns2.second-ns.de.

robotns3.second-ns.com resolves to 193.47.99.3 and 2001:67c:192c::add:a3. ns1.first-ns.de resolves to 213.239.242.238 and 2a01:4f8:0:a101::a:1. robotns2.second-ns.de resolves to 213.133.100.103 and 2a01:4f8:0:1::5ddc:2. All three hostnames point to two IP numbers each.

Mail Servers

Mail for cortex-development.com is handled by a single mail server, mail.cortex-development.com.

cortex-development.com - robtex.com