sentryo.tw - robtex.com
sentryo.tw
| DNSSEC | ⚠️ Not signed | ||||||
| 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 | ||||||
| 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(20) | ||||||
| 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 | ||||||
| MX | aer-mx-01.cisco.com(30) | ||||||
| A | 2001:420:4621::ad26:d496🇳🇱 ASNTTCISCO2001:420:4000::/36 170 West Tasman Drive San Jose CA 95134 United States | ||||||
| PTR | aer-mx-01.cisco.com | ||||||
| A | 173.38.212.150🇳🇱 ASNTTCISCO173.38.128.0/17 170 West Tasman Drive San Jose CA 95134 United States | ||||||
| PTR | aer-mx-01.cisco.com | ||||||
| SOA | ns1.cisco.compostmaster@cisco.com serial=42 | ||||||
tw
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a.dns.tw ⭐ | ||||||
| NS | anytld.apnic.net | ||||||
| NS | b.dns.tw | ||||||
| NS | c.dns.tw | ||||||
| NS | d.dns.tw | ||||||
| NS | e.dns.tw | ||||||
| NS | f.dns.tw | ||||||
| NS | g.dns.tw | ||||||
| NS | h.dns.tw | ||||||
| SOA | a.dns.twsnw@twnic.net.tw 2011-04-04 #27 | ||||||
Same first word
sentryo.tw |
sentryo.io |
sentryo.com |
sentryo.de |
sentryo.org |
sentryo.net |
sentryo.fr |
sentryo.com.tw |
sentryo.hk |
sentryo.eu |
sentryo.app |
Similar names
DNS History
7 records (7 active, 0 former)
●MXaer-mx-01.cisco.com2026-06-27 → 2026-07-29 · 2 obs
● 2026-07-29 18:29:14
●MXalln-mx-01.cisco.com2026-06-27 → 2026-07-29 · 2 obs
● 2026-07-29 18:29:14
●MXrcdn-mx-01.cisco.com2026-06-27 → 2026-07-29 · 2 obs
● 2026-07-29 18:29:14
●A72.163.4.1542026-06-27 → 2026-07-29 · 2 obs
● 2026-07-29 18:29:14
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| tw | g.dns.tw, h.dns.tw, d.dns.tw, c.dns.tw... | - |
| sentryo.tw | ns1.cisco.com, ns3.cisco.com, ns2.cisco.com | - |
✅ Authoritative Response
Server:173.37.146.41
NS records: ns1.cisco.com, ns3.cisco.com, ns2.cisco.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for sentryo.tw (unsigned zone)
⏱️ Timing
Total: 673ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 72.163.4.154 |
| NS | 3 | ns2.cisco.com, ns1.cisco.com... |
| MX | 3 | alln-mx-01.cisco.com (pri: 10), aer-mx-01.cisco.com (pri: 30)... |
| SOA | 1 | ns1.cisco.com postmaster.cisco.com |
Analysis
IP Addresses
sentryo.tw has exactly one IP address — 72.163.4.154.
ciscowebex.nl, ciscoconnect.jp, ciscosystems.mc.it plus two other host names have IP numbers in common with sentryo.tw.
Name Servers
sentryo.tw carries NS records delegating to ns1.cisco.com, ns2.cisco.com and ns3.cisco.com.
The name servers of sentryo.tw overlap at least partially with those of other domains — among them netacad-quality.com, femtoapps.net, tandberg.co.za and two more.
ns1.cisco.com, ns2.cisco.com and ns3.cisco.com are three hostnames that each resolve to a pair of IP addresses: ns1.cisco.com to 72.163.5.201 and 2001:420:1101:6::a, ns2.cisco.com to 64.102.255.44 and 2001:420:2041:5000::a, and ns3.cisco.com to 173.37.146.41 and 2001:420:1201:7::a.
Mail Servers
Mail for sentryo.tw is routed through three mail servers — aer-mx-01.cisco.com, alln-mx-01.cisco.com and rcdn-mx-01.cisco.com.
At least some of the mail servers used by sentryo.tw are shared with other domains: external.cisco.com, inlethd.com, intucellsystems.com and two others among them.
The mail servers mail1.dynamicsoft.com and mail.topspin.com are commonly paired with these mail servers.
aer-mx-01.cisco.com, alln-mx-01.cisco.com and rcdn-mx-01.cisco.com are three hostnames that each resolve to a pair of IP addresses: aer-mx-01.cisco.com to 173.38.212.150 and 2001:420:4621::ad26:d496, alln-mx-01.cisco.com to 173.37.147.230 and 2001:420:1201:6::ad25:93e6, and rcdn-mx-01.cisco.com to 72.163.7.166 and 2001:420:1101:7::48a3:166.