`vpn-concentrators.com`

DNSSEC	⚠️ Not signed
NS	`ns1.cisco.com` ⚠️ Not in zone NS records
		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` ⚠️ Not in zone NS records
		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`

`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=1778356751

Same first word

vpn-concentrators.com

vpn-concentrators.net

DNS History

2 records (2 active, 0 former)

●NSns1.cisco.com2026-05-03 → 2026-05-09 · 2 obs

● 2026-05-03 12:42:20
● 2026-05-09 20:24:10

●NSns2.cisco.com2026-05-03 → 2026-05-09 · 2 obs

● 2026-05-03 12:42:20
● 2026-05-09 20:24:10

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	l.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net...	-
vpn-concentrators.com	ns1.cisco.com, ns2.cisco.com	4 records

✅ Authoritative Response

Server:64.102.255.44

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for vpn-concentrators.com (unsigned zone)

⏱️ Timing

Total: 156ms | Queries: -

📄 Records

Type	Count	Sample Data

📌 Glue Records Collected

Total: 4

Out-of-bailiwick: 4 (ns1.cisco.com, ns1.cisco.com, ns2.cisco.com...)

Analysis

Name Servers

Delegation for vpn-concentrators.com rests with two name servers, ns1.cisco.com and ns2.cisco.com.

vpn-concentrators.com shares the same name server setup as other domains, including sionic.net, gridonomics.com, 254.9.251.63.in-addr.arpa, onbusinessnetwork.biz and ccie.biz.

vpn-concentrators.com at least partially shares name servers with other domains, for instance findsamfisher.mobi, ciscocertifications.com, internetofeverything.com, ciscotelepresence.info and telepresence-support.com.

These name servers are commonly used with the name servers ns3.cisco.com.

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.

vpn-concentrators.com - robtex.com