`cognitivesecurity.cz`

DNSSEC	⚠️ Not signed
A	72.163.4.154^{🇺🇸 ASNTTCISCO72.163.4.0/24 170 West Tasman Drive San Jose CA 95134 United States}
		PTR	`redirect.cisco.com`
NS	`ns1.cisco.com` ⭐
		A	2001:420:1101:6::a^{🇺🇸 ASNTTCISCO2001:420:1100::/41 170 West Tasman Drive San Jose CA 95134 United States}
			PTR	`ns1.cisco.com`
		A	72.163.5.201^{🇺🇸 ASNTTCISCO72.163.0.0/18 170 West Tasman Drive San Jose CA 95134 United States}
			PTR	`ns1.cisco.com`
NS	`ns2.cisco.com`
		A	2001:420:2041:5000::a^{🇺🇸 ASNTTCISCO2001:420:2000::/35 170 West Tasman Drive San Jose CA 95134 United States}
			PTR	`ns2.cisco.com`
		A	64.102.255.44^{🇺🇸 ASNTTCISCO64.102.0.0/16 170 West Tasman Drive San Jose CA 95134 United States}
			PTR	`ns2.cisco.com`
NS	`ns3.cisco.com`
		A	2001:420:1201:7::a^{🇺🇸 ASNTTCISCO2001:420:1200::/41 170 West Tasman Drive San Jose CA 95134 United States}
			PTR	`ns3.cisco.com`
		A	173.37.146.41^{🇺🇸 ASNTTCISCO173.37.128.0/19 170 West Tasman Drive San Jose CA 95134 United States}
			PTR	`ns3.cisco.com`
MX	`alln-mx-01.cisco.com` ⭐
		A	2001:420:1201:6::ad25:93e6^{🇺🇸 ASNTTCISCO2001:420:1200::/41 170 West Tasman Drive San Jose CA 95134 United States}
			PTR	`alln-mx-01.cisco.com`
		A	173.37.147.230^{🇺🇸 ASNTTCISCO173.37.128.0/19 170 West Tasman Drive San Jose CA 95134 United States}
			PTR	`alln-mx-01.cisco.com`
MX	`rcdn-mx-01.cisco.com` ⭐
		A	2001:420:1101:7::48a3:166^{🇺🇸 ASNTTCISCO2001:420:1100::/41 170 West Tasman Drive San Jose CA 95134 United States}
			PTR	`rcdn-mx-01.cisco.com`
		A	72.163.7.166^{🇺🇸 ASNTTCISCO72.163.7.0/24 170 West Tasman Drive San Jose CA 95134 United States}
			PTR	`rcdn-mx-01.cisco.com`
SOA	`ns1.cisco.com`postmaster@cisco.com serial=8

`cz`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.ns.nic.cz` ⭐
	NS	`b.ns.nic.cz`
	NS	`c.ns.nic.cz`
	NS	`d.ns.nic.cz`
	SOA	`a.ns.nic.cz`hostmaster@nic.cz serial=1778365037

Same first word

cognitivesecurity.eu

cognitivesecurity.org

cognitivesecurity.cz

DNS History

8 records (6 active, 2 former)

○NSedns-aln1-1-l2015-05-10 → 2015-05-10 · 3 obs

● 2015-05-10 06:21:24
○ 2015-10-10 21:19:46
○ 2026-05-09 22:49:10

○NSedns-aln1-1-l.cisco.com2015-05-10 → 2016-07-10 · 4 obs

● 2015-05-10 06:21:24
● 2016-07-10 13:19:30
○ 2020-01-24 19:24:20
○ 2026-05-09 22:49:10

●NSns1.cisco.com2015-05-10 → 2026-05-09 · 2 obs

● 2015-05-10 06:21:24
● 2026-05-09 22:49:10

●NSns2.cisco.com2015-05-10 → 2026-05-09 · 2 obs

● 2015-05-10 06:21:24
● 2026-05-09 22:49:10

●NSns3.cisco.com2015-05-10 → 2026-05-09 · 2 obs

● 2015-05-10 06:21:24
● 2026-05-09 22:49:10

●MXalln-mx-01.cisco.com2015-05-10 → 2026-05-09 · 2 obs

● 2015-05-10 06:21:24
● 2026-05-09 22:49:10

●MXrcdn-mx-01.cisco.com2015-05-10 → 2026-05-09 · 2 obs

● 2015-05-10 06:21:24
● 2026-05-09 22:49:10

●A72.163.4.1542015-05-10 → 2026-05-09 · 2 obs

● 2015-05-10 06:21:24
● 2026-05-09 22:49:10

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cz	d.ns.nic.cz, b.ns.nic.cz, a.ns.nic.cz, c.ns.nic.cz	-
cognitivesecurity.cz	ns1.cisco.com, ns3.cisco.com, ns2.cisco.com	-

✅ Authoritative Response

Server:72.163.5.201

NS records: ns1.cisco.com, ns3.cisco.com, ns2.cisco.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for cognitivesecurity.cz (unsigned zone)

⏱️ Timing

Total: 723ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`72.163.4.154`
NS	3	`ns2.cisco.com, ns3.cisco.com...`
MX	2	`alln-mx-01.cisco.com (pri: 15), rcdn-mx-01.cisco.com (pri: 15)`
SOA	1	`ns1.cisco.com postmaster.cisco.com`

Analysis

IP Addresses

cognitivesecurity.cz points to a single IP number: 72.163.4.154.

Other host names, for instance cisco.int.ci, cisco.pl, collaboration.cisco, ciscopowered.info and cisco.dk share IP numbers with cognitivesecurity.cz.

Name Servers

The domain cognitivesecurity.cz is delegated to three name servers: ns1.cisco.com, ns2.cisco.com and ns3.cisco.com.

cognitivesecurity.cz shares name servers with other domains at least partially, for instance ciscotechnologyinc.info, cisco.au, ciscodvn.net, cisco-iphone.org and myciscodrive.net.

Host names with two IP numbers:

ns1.cisco.com points to 2001:420:1101:6::a and 72.163.5.201

ns2.cisco.com points to 2001:420:2041:5000::a and 64.102.255.44

ns3.cisco.com points to 2001:420:1201:7::a and 173.37.146.41

Mail Servers

cognitivesecurity.cz is handled by two mail servers: alln-mx-01.cisco.com and rcdn-mx-01.cisco.com.

cognitivesecurity.cz uses the same mail server setup as other domains, for example ubiquisys.com.

cognitivesecurity.cz shares some mail servers with other domains, including netsift.net, meetingplace.net, cisco.zip, ciscolearningsystem.com and jabber.com.

these mail servers are commonly used with aer-mx-01.cisco.com, mail1.dynamicsoft.com, rtp-mx-01.cisco.com and ams-mx-01.cisco.com.

Host names with two IP numbers:

The host alln-mx-01.cisco.com points to 2001:420:1201:6::ad25:93e6 and 173.37.147.230.

The host rcdn-mx-01.cisco.com points to 2001:420:1101:7::48a3:166 and 72.163.7.166.

cognitivesecurity.cz - robtex.com