c21tw.com - robtex.com
c21tw.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.netnstld@verisign-grs.com serial=1774454997 | ||||||
Same first word
c21tw.com |
Similar names
DNS History
12 records (9 active, 3 former)
●NSamanda.ns.cloudflare.com2026-03-16 → 2026-03-25 · 3 obs
● 2026-03-16 20:18:10
● 2026-03-25 16:13:34
○NSns1.hosting.co.kr2016-12-19 → 2018-01-03 · 4 obs
● 2018-01-03 13:21:02
○ 2026-03-16 20:18:10
○ 2026-03-25 16:13:34
○NSns2.hosting.co.kr2016-12-19 → 2018-01-03 · 4 obs
● 2018-01-03 13:21:02
○ 2026-03-16 20:18:10
○ 2026-03-25 16:13:34
●NSvick.ns.cloudflare.com2026-03-16 → 2026-03-25 · 3 obs
● 2026-03-16 20:18:10
● 2026-03-25 16:13:34
●MXalt1.aspmx.l.google.com2026-03-16 → 2026-03-25 · 2 obs
● 2026-03-25 16:13:34
●MXalt2.aspmx.l.google.com2026-03-16 → 2026-03-25 · 2 obs
● 2026-03-25 16:13:34
●MXalt3.aspmx.l.google.com2026-03-16 → 2026-03-25 · 2 obs
● 2026-03-25 16:13:34
●MXalt4.aspmx.l.google.com2026-03-16 → 2026-03-25 · 2 obs
● 2026-03-25 16:13:34
●MXaspmx.l.google.com2026-03-16 → 2026-03-25 · 2 obs
● 2026-03-25 16:13:34
●MXdns.century21.tw2026-03-16 → 2026-03-25 · 2 obs
● 2026-03-25 16:13:34
●MXsmtp.century21.tw2026-03-16 → 2026-03-25 · 2 obs
● 2026-03-25 16:13:34
○A211.234.63.2322016-12-19 → 2018-01-03 · 4 obs
● 2018-01-03 13:21:02
○ 2026-03-16 20:18:10
○ 2026-03-25 16:13:34
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| c21tw.com | amanda.ns.cloudflare.com, vick.ns.cloudflare.com | 12 records |
✅ Authoritative Response
Server:108.162.192.63
NS records: amanda.ns.cloudflare.com, vick.ns.cloudflare.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for c21tw.com (unsigned zone)
⏱️ Timing
Total: 194ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| NS | 2 | amanda.ns.cloudflare.com, vick.ns.cloudflare.com |
| MX | 7 | dns.century21.tw (pri: 10), smtp.century21.tw (pri: 20)... |
| TXT | 2 | google-site-verification=miqpRTfGcGLBpOQ, v=spf1 +mx +a +ip4:59.124.135.90 +ip4:1. |
| SOA | 1 | amanda.ns.cloudflare.com dns.cloudflare. |
📌 Glue Records Collected
Total: 12
Out-of-bailiwick: 12 (amanda.ns.cloudflare.com, amanda.ns.cloudflare.com, amanda.ns.cloudflare.com...)
Analysis
Name Servers
c21tw.com has two name servers: amanda.ns.cloudflare.com and vick.ns.cloudflare.com.
c21tw.com shares the same name server setup as other domains, for example seoark.com, stevenchin.me, wholesm.com, sell21.com and ceeek.com.
c21tw.com shares some name servers with other domains, for example miners.pro, bychips-th.com, lirenxing.net, 9911006.com and vthmk.cn.
These name servers are commonly used with the name servers tosana.ns.cloudflare.com.
Host names with six IP numbers: amanda.ns.cloudflare.com points to: 2606:4700:50::adf5:3a3f, 2803:f800:50::6ca2:c03f, 2a06:98c1:50::ac40:203f, 108.162.192.63, 172.64.32.63 and 173.245.58.63; vick.ns.cloudflare.com points to: 2606:4700:58::adf5:3bf4, 2803:f800:50::6ca2:c1f4, 2a06:98c1:50::ac40:21f4, 108.162.193.244, 172.64.33.244 and 173.245.59.244.
Mail Servers
c21tw.com is handled by seven mail servers: dns.century21.tw, smtp.century21.tw, aspmx.l.google.com, alt1.aspmx.l.google.com, alt2.aspmx.l.google.com, alt3.aspmx.l.google.com and alt4.aspmx.l.google.com.
c21tw.com shares some mail servers with other domains, at least partially; for instance allsortsof.com, deeptihosting.com, ns500698.ns500758.ns500758.ns500735.ns500736.ns500736.ns500735.ns500735.ns500708.ns500708.ns500708.ns500698.ns500698.ns500619.ns500686.ns500619.ns500619.trackreceptor.com, ns500731.ns500731.ns500671.ns500742.ns500671.ns500731.ns500742.ns500671.ns500705.ns500671.ns500671.ns500678.ns500671.ns500291.ns500649.lustychickser.com and ns500768.ns500758.ns500698.ns500698.ns500758.ns500698.ns500698.ns500698.ns500708.ns500698.ns500698.ns500619.ns500698.ns500576.ns500619.ns500576.trackreceptor.com.
these mail servers are often used together with the mail servers aspmx2.googlemail.com, aspmx3.googlemail.com, aspmx4.googlemail.com and aspmx5.googlemail.com.
Host names with two IP numbers:
The host name aspmx.l.google.com points to: 2607:f8b0:4023:c0d::1a and 142.250.141.26.
The host name alt1.aspmx.l.google.com points to: 2a00:1450:4025:402::1b and 142.250.102.27.
The host name alt2.aspmx.l.google.com points to: 2a00:1450:4013:c1e::1b and 192.178.213.26.
The host name alt3.aspmx.l.google.com points to: 2607:f8b0:4023:3003::1b and 172.253.145.26.
The host name alt4.aspmx.l.google.com points to: 2607:f8b0:4003:c4a::1a and 142.251.96.26.
Host names with one IP number:
The host name dns.century21.tw points to: 59.124.135.90.
The host name smtp.century21.tw points to: 59.124.135.90.
Host names that point to 59.124.135.90: dns.century21.tw and smtp.century21.tw.