`hammerheadnetworks.com`

DNSSEC	⚠️ Not signed
A	2001:420:1101:1::b^{🇺🇸 ASNTTCISCO2001:420:1100::/41 170 West Tasman Drive San Jose CA 95134 United States}
		PTR	`redirect.cisco.com`
A	72.163.4.154^{🇺🇸 ASNTTCISCO72.163.4.0/24 170 West Tasman Drive San Jose CA 95134 United States}
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=7

`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=1775984962

Same first word

hammerheadnetworks.com

DNS History

7 records (5 active, 2 former)

○NSedns-aln1-1-l2017-03-21 → 2017-03-21 · 4 obs

○ 2016-07-13 04:49:04
● 2017-03-21 04:59:12
○ 2020-04-08 01:14:24
○ 2026-04-12 09:36:24

○NSedns-aln1-1-l.cisco.com2015-08-06 → 2016-07-13 · 4 obs

● 2015-08-06 18:13:16
● 2016-07-13 04:49:04
○ 2017-03-21 04:59:12
○ 2026-04-12 09:36:24

●NSns1.cisco.com2015-08-06 → 2026-04-12 · 2 obs

● 2015-08-06 18:13:16
● 2026-04-12 09:36:24

●NSns2.cisco.com2015-08-06 → 2026-04-12 · 2 obs

● 2015-08-06 18:13:16
● 2026-04-12 09:36:24

●NSns3.cisco.com2015-08-06 → 2026-04-12 · 2 obs

● 2015-08-06 18:13:16
● 2026-04-12 09:36:24

●A2001:420:1101:1::b2015-08-06 → 2026-04-12 · 2 obs

● 2015-08-06 18:13:16
● 2026-04-12 09:36:24

●A72.163.4.1542015-08-06 → 2026-04-12 · 2 obs

● 2015-08-06 18:13:16
● 2026-04-12 09:36:24

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	d.gtld-servers.net, e.gtld-servers.net, f.gtld-servers.net, g.gtld-servers.net...	-
hammerheadnetworks.com	ns1.cisco.com, ns2.cisco.com, ns3.cisco.com	6 records

✅ Authoritative Response

Server:72.163.5.201

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for hammerheadnetworks.com (unsigned zone)

⏱️ Timing

Total: 294ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`72.163.4.154`
AAAA	1	`2001:420:1101:1::b`
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

IP Addresses

hammerheadnetworks.com resolves to two IP numbers: 2001:420:1101:1::b and 72.163.4.154.

Other host names, for instance cisco.com.uy, ciscosystems.no.it, cisco-returns.com, ciscointernethome.com and ciscowebex.net.cn share IP numbers with hammerheadnetworks.com.

Name Servers

hammerheadnetworks.com delegates to three name servers: ns1.cisco.com, ns2.cisco.com and ns3.cisco.com.

hammerheadnetworks.com shares some name servers with other domains, for example ciscosystems.biz, ciscoasr.net, wangxun.xn--fiqz9s, aironet.asia and showandshare.com.

Host names with two IP numbers:

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

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

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

hammerheadnetworks.com - robtex.com