extud.com - dns.ninja

`extud.com`

DNSSEC	⚠️ Not signed
A	61.221.12.18^{🇹🇼 HiNet61.221.0.0/16 (HiNet) Chunghwa Telecom Co., Ltd.}
		PTR	`ns4.potia.com`
NS	`ns3.potia.com` ⭐ ⚠️ Not in parent delegation
		A	61.221.12.17^{🇹🇼 HiNet61.221.0.0/16 (HiNet) Chunghwa Telecom Co., Ltd.}
			PTR	`whale.potia.net`
NS	`ns4.potia.com` ⚠️ Not in parent delegation
		A	2001:b031:8006:ff34::8^{🇹🇼 HiNet2001:b031:8000::/36}
			PTR	`2001-b031-8006-ff34-0000-0000-0000-0008.hinet-ip6.hinet.net`
		A	61.221.12.18^{🇹🇼 HiNet61.221.0.0/16 (HiNet) Chunghwa Telecom Co., Ltd.}
			PTR	`ns4.potia.com`
NS	`ta57.potia.com` ⚠️ Not in zone NS records
		A	61.221.12.17^{🇹🇼 HiNet61.221.0.0/16 (HiNet) Chunghwa Telecom Co., Ltd.}
			PTR	`whale.potia.net`
NS	`ta58.potia.com` ⚠️ Not in zone NS records
		A	61.221.12.18^{🇹🇼 HiNet61.221.0.0/16 (HiNet) Chunghwa Telecom Co., Ltd.}
			PTR	`ns4.potia.com`
MX	`extud.com` ⭐
		A	61.221.12.18^{🇹🇼 HiNet61.221.0.0/16 (HiNet) Chunghwa Telecom Co., Ltd.}
			PTR	`ns4.potia.com`
TXT	`v=spf1 ip4:61.221.12.17 +a +mx +ip4:61.221.12.18 +ip4:60.248.112.149 +ip4:61....`
SOA	`ns3.potia.com`notice@potia.net 2026-07-04 #1

`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=1786147494

MX for

extud.com

Previously MX for

mail.extud.com

Subdomains

mail.extud.com

Same first word

extud.com

Similar names

dutex.ca

xtedu.com

duxte.net

dextu.com

eduxt.com

txedu.net

tudex.de

tudex.net

xtude.com

dutex.com

detux.com

tedux.com

duext.com

duxte.co.tz

tuxed.org

deuxt.com

txedu.com

udtex.com

deutx.com

tudex.com

uxted.com

tuxed.net

tuxed.com

edutx.com

duxet.com

tudex.fr

tuxed.fr

dexut.com

detux.de

dutex.ind.br

dutex.pt

txedu.cn

DNS History

14 records (6 active, 8 former)

●NSns3.potia.com2026-02-18 → 2026-08-08 · 8 obs

○ 2020-01-02 23:10:18
● 2026-02-18 02:28:28
● 2026-03-26 00:21:44
○ 2026-03-26 09:13:14
● 2026-04-13 03:09:56
○ 2026-04-22 15:09:18
● 2026-04-25 23:03:16
● 2026-08-08 00:32:32

●NSns4.potia.com2026-02-18 → 2026-08-08 · 7 obs

○ 2020-01-02 23:10:18
● 2026-02-18 02:28:28
● 2026-03-26 00:21:44
○ 2026-03-26 09:13:14
○ 2026-04-22 15:09:18
● 2026-04-25 23:03:16
● 2026-08-08 00:32:32

○NSta15.potia.com2015-08-24 → 2016-03-21 · 4 obs

● 2015-08-24 17:28:08
● 2016-03-21 04:43:54
○ 2017-01-12 01:10:02
○ 2026-08-08 00:32:32

○NSta16.potia.com2015-08-24 → 2016-03-21 · 4 obs

● 2015-08-24 17:28:08
● 2016-03-21 04:43:54
○ 2017-01-12 01:10:02
○ 2026-08-08 00:32:32

○NSta29.potia.com2017-01-12 → 2017-01-12 · 4 obs

○ 2016-03-21 04:43:54
● 2017-01-12 01:10:02
○ 2020-01-02 23:10:18
○ 2026-08-08 00:32:32

○NSta30.potia.com2017-01-12 → 2017-01-12 · 4 obs

○ 2016-03-21 04:43:54
● 2017-01-12 01:10:02
○ 2020-01-02 23:10:18
○ 2026-08-08 00:32:32

●NSta57.potia.com2020-01-02 → 2026-08-08 · 3 obs

○ 2017-01-12 01:10:02
● 2020-01-02 23:10:18
● 2026-08-08 00:32:32

●NSta58.potia.com2020-01-02 → 2026-08-08 · 3 obs

○ 2017-01-12 01:10:02
● 2020-01-02 23:10:18
● 2026-08-08 00:32:32

●MXextud.com2015-08-24 → 2026-08-08 · 6 obs

● 2015-08-24 17:28:08
● 2026-03-26 00:21:44
○ 2026-03-26 09:13:14
○ 2026-04-22 15:09:18
● 2026-04-25 23:03:16
● 2026-08-08 00:32:32

○A2001:b031:8006:ff34::82026-02-18 → 2026-04-27 · 9 obs

○ 2020-01-02 23:10:18
● 2026-02-18 02:28:28
● 2026-03-26 00:21:44
○ 2026-03-26 09:13:14
○ 2026-04-22 15:09:18
● 2026-04-25 23:03:16
● 2026-04-27 17:09:54
○ 2026-05-04 21:45:42
○ 2026-08-08 00:32:32

○A210.242.143.62015-08-24 → 2016-03-21 · 4 obs

● 2015-08-24 17:28:08
● 2016-03-21 04:43:54
○ 2017-01-12 01:10:02
○ 2026-08-08 00:32:32

○A61.221.12.122017-01-12 → 2017-01-12 · 4 obs

○ 2016-03-21 04:43:54
● 2017-01-12 01:10:02
○ 2020-01-02 23:10:18
○ 2026-08-08 00:32:32

●A61.221.12.182026-02-18 → 2026-08-08 · 7 obs

○ 2020-01-02 23:10:18
● 2026-02-18 02:28:28
● 2026-03-26 00:21:44
○ 2026-03-26 09:13:14
○ 2026-04-22 15:09:18
● 2026-04-25 23:03:16
● 2026-08-08 00:32:32

○A61.221.12.582020-01-02 → 2020-01-02 · 4 obs

○ 2017-01-12 01:10:02
● 2020-01-02 23:10:18
○ 2026-02-18 02:28:28
○ 2026-08-08 00:32:32

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
extud.com	ta57.potia.com, ta58.potia.com	2 records

✅ Authoritative Response

Server:61.221.12.17

NS records: ta57.potia.com, ta58.potia.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for extud.com (unsigned zone)

⏱️ Timing

Total: 882ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`61.221.12.18`
NS	2	`ns3.potia.com, ns4.potia.com`
MX	1	`extud.com (pri: 0)`
TXT	1	`v=spf1 ip4:61.221.12.17 +a +mx +ip4:61.2`
SOA	1	`ns3.potia.com notice.potia.net`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ta57.potia.com, ta58.potia.com)

Analysis

Hierarchy

mail.extud.com is a subdomain of extud.com.

Mail Server Role

extud.com serves as a mail server for extud.com.

IP Addresses

extud.com has exactly one IP address — 61.221.12.18.

asiafood.com.tw, peiyang.com.tw, tj8888.com.tw plus two other host names have IP numbers in common with extud.com.

Name Servers

Four name servers handle the delegation for extud.com: ns3.potia.com, ns4.potia.com, ta57.potia.com and ta58.potia.com.

The name servers of extud.com overlap at least partially with those of other domains — among them looklin.com, herngshan.com.tw, olive.com.tw and two more.

These name servers commonly appear alongside the name servers d1.potia.com and d2.potia.com.

Host names pointing to two IP addresses:

The A records for ns4.potia.com return 61.221.12.18 and 2001:b031:8006:ff34::8.

Host names resolving to a single IP address:

ns3.potia.com resolves to the IP address 61.221.12.17.

ta57.potia.com resolves to the IP address 61.221.12.17.

ta58.potia.com resolves to the IP address 61.221.12.18.

ns4.potia.com and ta58.potia.com each have 61.221.12.18 IP addresses.

ns3.potia.com and ta57.potia.com each have 61.221.12.17 IP addresses.

Mail Servers

extud.com uses exactly one mail server, which is extud.com.

extud.com resolves to 61.221.12.18 and no other IP number.