`c21.tw`

DNSSEC	⚠️ Not signed
A	122.147.134.106^{🇹🇼 NCIC-TW122.147.134.0/24 Far Eastone Telecommunications Co., Ltd}
NS	`amanda.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3a3f^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`amanda.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c03f^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`amanda.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:203f^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`amanda.ns.cloudflare.com`
		A	108.162.192.63^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`amanda.ns.cloudflare.com`
		A	172.64.32.63^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`amanda.ns.cloudflare.com`
		A	173.245.58.63^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`amanda.ns.cloudflare.com`
NS	`vick.ns.cloudflare.com`
		A	2606:4700:58::adf5:3bf4^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`vick.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c1f4^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`vick.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:21f4^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`vick.ns.cloudflare.com`
		A	108.162.193.244^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`vick.ns.cloudflare.com`
		A	172.64.33.244^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`vick.ns.cloudflare.com`
		A	173.245.59.244^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`vick.ns.cloudflare.com`
MX	`dns.century21.tw` ⭐
		A	59.124.135.90^{🇹🇼 HiNet59.124.0.0/16 (HiNet) Chunghwa Telecom Co., Ltd.}
			PTR	`dns.century21.tw`
MX	`smtp.century21.tw`⁽³⁰⁾
		A	59.124.135.90^{🇹🇼 HiNet59.124.0.0/16 (HiNet) Chunghwa Telecom Co., Ltd.}
			PTR	`dns.century21.tw`
TXT	`MS=DEBAE352C347B11902C5D0F9A904B4A62064B156`
TXT	`google-site-verification=7OjkVYjDVt36gEp3gShcnHLwxu-HtZG-Ec-UATR7qWE`
TXT	`google-site-verification=oK_uAFyegwo6TllwRoC55Fbv3AB6CYs46TTkIkyDwMg`
TXT	`google-site-verification=xgNLNd_f5al6f5Zpy_m9GlhT9rumHde4KqEyKErZb48`
TXT	`v=spf1 +mx +a +ip4:59.124.135.90 +ip4:1.34.102.177 +ip4:122.147.134.106 +ip4:...`
TXT	`yahoo-verification-key=pqj3FYVzCgyJubHQFDiUd9/hfuwRYuVNxSVitDdngKc=`
SOA	`amanda.ns.cloudflare.com`dns@cloudflare.com serial=2399965688

`tw`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.dns.tw` ⭐
	NS	`anytld.apnic.net` ⚠️ Not in parent delegation
	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.tw`snw@twnic.net.tw 2011-01-17 #94

Same first word

c21.al

c21.co

c21.hr

c21.com.br

c21.pe

c21.com.cy

c21.com.vn

c21.com.cn

c21.to

c21.site

c21.gy

c21.mn

c21.pl

c21.tw

c21.me

c21.be

c21.properties

c21.com.pe

c21.azureedge.net

c21.com

c21.com.sg

c21.cz

c21.bz

c21.net

c21.nyc

c21.guru

c21.vn

c21.com.bo

c21.info

c21.in

c21.tv

c21.ru

c21.biz

c21.one

c21.it

c21.com.hk

c21.asia

c21.si

c21.at

c21.ir

c21.online

c21.mx

c21.cn

c21.name

c21.pt

c21.ca

c21.gr

c21.sk

c21.eu

c21.hk

c21.fr

c21.us

c21.dk

c21.nl

c21.xyz

c21.net.cn

c21.com.tr

c21.ro

c21.ae

c21.tech

c21.homes

Similar names

21c.nl

c12.in

21c.xin

c12.fr

c12.dk

2c1.fr

21c.cn

21c.me

21c.ru

1c2.me

21c.co.jp

1c2.com.cn

c12.com

c12.kr

c12.nl

21c.it

1c2.net

12c.in

12c.co.uk

12c.eu

c12.com.br

2c1.com

c12.tv

2c1.net

c12.ca

21c.com

1c2.fr

12c.org

21c.org

12c.cn

12c.io

21c.jp

12c.com.cn

c12.ru

21c.community

21c.biz

21c.or.jp

1c2.com

2c1.cz

12c.de

c12.de

12c.us

c12.us

c12.online

21c.tc

c12.org

c12.pw

c12.co.il

12c.cz

c12.cz

21c.ca

21c.online

21c.pl

1c2.eu

c12.pl

21c.de

c12.cn

12c.no

21c.email

21c.co.uk

1c2.mobi

1c2.de

2c1.de

c12.com.au

c12.me

21c.co.in

12c.com

12c.me

c12.it

21c.or.kr

DNS History

16 records (5 active, 11 former)

●NSamanda.ns.cloudflare.com2026-05-05 → 2026-05-13 · 3 obs

○ 2020-02-14 14:03:00
● 2026-05-05 12:24:30
● 2026-05-13 07:17:00

○NSlocalhost\@2020-02-14 → 2020-02-14 · 3 obs

● 2020-02-14 14:03:00
○ 2026-05-05 12:24:30
○ 2026-05-13 07:17:00

○NSns1.cyberdns.tw2020-02-14 → 2020-02-14 · 3 obs

● 2020-02-14 14:03:00
○ 2026-05-05 12:24:30
○ 2026-05-13 07:17:00

○NSns2.cyberdns.tw2020-02-14 → 2020-02-14 · 3 obs

● 2020-02-14 14:03:00
○ 2026-05-05 12:24:30
○ 2026-05-13 07:17:00

●NSvick.ns.cloudflare.com2026-05-05 → 2026-05-13 · 3 obs

○ 2020-02-14 14:03:00
● 2026-05-05 12:24:30
● 2026-05-13 07:17:00

○MXalt1.aspmx.l.google.com2020-02-14 → 2020-02-14 · 3 obs

● 2020-02-14 14:03:00
○ 2026-05-05 12:24:30
○ 2026-05-13 07:17:00

○MXalt2.aspmx.l.google.com2020-02-14 → 2020-02-14 · 3 obs

● 2020-02-14 14:03:00
○ 2026-05-05 12:24:30
○ 2026-05-13 07:17:00

○MXalt3.aspmx.l.google.com2020-02-14 → 2020-02-14 · 3 obs

● 2020-02-14 14:03:00
○ 2026-05-05 12:24:30
○ 2026-05-13 07:17:00

○MXaspmx2.googlemail.com2020-02-14 → 2020-02-14 · 3 obs

● 2020-02-14 14:03:00
○ 2026-05-05 12:24:30
○ 2026-05-13 07:17:00

○MXaspmx3.googlemail.com2020-02-14 → 2020-02-14 · 3 obs

● 2020-02-14 14:03:00
○ 2026-05-05 12:24:30
○ 2026-05-13 07:17:00

○MXaspmx4.googlemail.com2020-02-14 → 2020-02-14 · 3 obs

● 2020-02-14 14:03:00
○ 2026-05-05 12:24:30
○ 2026-05-13 07:17:00

●MXdns.century21.tw2026-05-05 → 2026-05-13 · 3 obs

○ 2020-02-14 14:03:00
● 2026-05-05 12:24:30
● 2026-05-13 07:17:00

●MXsmtp.century21.tw2026-05-05 → 2026-05-13 · 3 obs

○ 2020-02-14 14:03:00
● 2026-05-05 12:24:30
● 2026-05-13 07:17:00

●A122.147.134.1062026-05-05 → 2026-05-13 · 3 obs

○ 2020-02-14 14:03:00
● 2026-05-05 12:24:30
● 2026-05-13 07:17:00

○A210.63.220.1502020-02-14 → 2020-02-14 · 3 obs

● 2020-02-14 14:03:00
○ 2026-05-05 12:24:30
○ 2026-05-13 07:17:00

○A210.63.220.1512020-02-14 → 2020-02-14 · 3 obs

● 2020-02-14 14:03:00
○ 2026-05-05 12:24:30
○ 2026-05-13 07:17:00

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
tw	a.dns.tw, b.dns.tw, c.dns.tw, d.dns.tw...	-
c21.tw	amanda.ns.cloudflare.com, vick.ns.cloudflare.com	-

✅ Authoritative Response

Server:108.162.193.244

NS records: amanda.ns.cloudflare.com, vick.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for c21.tw (unsigned zone)

⏱️ Timing

Total: 951ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`122.147.134.106`
NS	2	`amanda.ns.cloudflare.com, vick.ns.cloudflare.com`
MX	2	`dns.century21.tw (pri: 20), smtp.century21.tw (pri: 30)`
TXT	6	`MS=DEBAE352C347B11902C5D0F9A904B4A62064B, google-site-verification=7OjkVYjDVt36gEp...`
SOA	1	`amanda.ns.cloudflare.com dns.cloudflare.`

Analysis

IP Addresses

c21.tw points to a single IP: 122.147.134.106.

Other host names, for instance century21.com.tw, dns3.century21.com.tw, 087805050.century21.com.tw, www.century21.com.tw and mail.century21.com.tw share IP numbers with c21.tw.

Name Servers

Two name servers amanda.ns.cloudflare.com and vick.ns.cloudflare.com handle delegation for c21.tw.

c21.tw uses the same name server setup as other domains, for example clocart.com, xn--21-sw2cs16p.tw, gmsell.com, century21.tw and tomcar.lu.

c21.tw partially shares name servers with other domains; examples include oenq.com, netcoiins-logup.pages.dev, suitable.nl, psyborx.com and nbtopkable.com.

These name servers are often used with the name servers etta.ns.cloudflare.com and andy.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

c21.tw is handled by two mail servers: dns.century21.tw and smtp.century21.tw.

c21.tw uses the same mail server setup as other domains, for instance century21.tw and century21.com.tw.

Some mail servers are shared between c21.tw and other domains, for example c21tw.com.

these mail servers are commonly used with 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.

Host names with one IP number

Host name dns.century21.tw points to 59.124.135.90

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

c21.tw - robtex.com

c21.tw

tw

Same first word

Similar names

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

Analysis

IP Addresses

Name Servers

Mail Servers

`c21.tw`

`tw`