`ciscostudyzone.com`

DNSSEC	⚠️ Not signed
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`
SOA	`ns1.cisco.com`postmaster@cisco.com serial=1

`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=1775957292

Same first word

ciscostudyzone.com

DNS History

5 records (3 active, 2 former)

○NSedns-aln1-1-l2017-01-09 → 2017-01-09 · 4 obs

○ 2016-04-17 10:51:22
● 2017-01-09 03:56:40
○ 2018-07-03 04:30:08
○ 2026-04-12 01:36:20

○NSedns-aln1-1-l.cisco.com2015-06-29 → 2016-04-17 · 5 obs

○ 2007-10-31 21:16:48
● 2015-06-29 09:06:26
● 2016-04-17 10:51:22
○ 2017-01-09 03:56:40
○ 2026-04-12 01:36:20

●NSns1.cisco.com2007-10-31 → 2026-04-12 · 2 obs

● 2007-10-31 21:16:48
● 2026-04-12 01:36:20

●NSns2.cisco.com2007-10-31 → 2026-04-12 · 2 obs

● 2007-10-31 21:16:48
● 2026-04-12 01:36:20

●NSns3.cisco.com2015-06-29 → 2026-04-12 · 3 obs

○ 2007-10-31 21:16:48
● 2015-06-29 09:06:26
● 2026-04-12 01:36:20

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	m.gtld-servers.net, j.gtld-servers.net, d.gtld-servers.net, f.gtld-servers.net...	-
ciscostudyzone.com	ns1.cisco.com, ns2.cisco.com, ns3.cisco.com	6 records

✅ Authoritative Response

Server:173.37.146.41

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for ciscostudyzone.com (unsigned zone)

⏱️ Timing

Total: 246ms | Queries: -

📄 Records

Type	Count	Sample Data
NS	3	`ns1.cisco.com, ns2.cisco.com...`
SOA	1	`ns1.cisco.com postmaster.cisco.com`

📌 Glue Records Collected

Total: 6

Out-of-bailiwick: 6 (ns1.cisco.com, ns1.cisco.com, ns2.cisco.com...)

Analysis

Name Servers

ciscostudyzone.com is delegated to three name servers: ns1.cisco.com, ns2.cisco.com and ns3.cisco.com.

ciscostudyzone.com at least partially shares name servers with other domains, for instance netacad-reports.net, ciscosystems.qh.cn, cisco.tr, tandbergrussia.ru and gridonomic.net.

Host names with two IP numbers:

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

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

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

ciscostudyzone.com - robtex.com