`coretech-optical.com`

DNSSEC	⚠️ Not signed
A	202.39.131.138^{🇹🇼 HiNet202.39.128.0/17 (HiNet) Chunghwa Telecom Co., Ltd.}
		PTR	`smtp.hibox.hinet.net`
NS	`ns1.tradeserv.com` ⭐
		A	210.65.244.135^{🇹🇼 HiNet210.65.0.0/16 (HiNet) Chunghwa Telecom Co., Ltd.}
			PTR	`210-65-244-135.hinet-ip.hinet.net`
NS	`ns.tradeserv.com`
		A	210.64.125.39^{🇹🇼 Seednet210.64.125.0/24 SeedNet}
			PTR	`ns.tradeserv.com`
MX	`coretech-optical.com` ⭐
		A	202.39.131.138^{🇹🇼 HiNet202.39.128.0/17 (HiNet) Chunghwa Telecom Co., Ltd.}
			PTR	`smtp.hibox.hinet.net`
SOA	`ns.tradeserv.com`root@ns.tradeserv.com 2008-10-21 #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=1777254021

MX for

coretech-optical.com

Same first word

coretech-optical.com

DNS History

6 records (4 active, 2 former)

●NSns.tradeserv.com2015-06-13 → 2026-04-27 · 2 obs

● 2015-06-13 04:26:08
● 2026-04-27 02:03:10

●NSns1.tradeserv.com2026-04-12 → 2026-04-27 · 3 obs

○ 2017-01-29 14:46:24
● 2026-04-12 11:55:48
● 2026-04-27 02:03:10

○NSns2.tradeserv.com2015-06-13 → 2017-01-29 · 4 obs

● 2015-06-13 04:26:08
● 2017-01-29 14:46:24
○ 2026-04-12 11:55:48
○ 2026-04-27 02:03:10

○NSns3.tradeserv.com2015-06-13 → 2017-01-29 · 4 obs

● 2015-06-13 04:26:08
● 2017-01-29 14:46:24
○ 2026-04-12 11:55:48
○ 2026-04-27 02:03:10

●MXcoretech-optical.com2015-06-13 → 2026-04-27 · 2 obs

● 2015-06-13 04:26:08
● 2026-04-27 02:03:10

●A202.39.131.1382015-06-13 → 2026-04-27 · 2 obs

● 2015-06-13 04:26:08
● 2026-04-27 02:03:10

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
coretech-optical.com	ns.tradeserv.com, ns1.tradeserv.com	2 records

✅ Authoritative Response

Server:210.65.244.135

NS records: ns.tradeserv.com, ns1.tradeserv.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for coretech-optical.com (unsigned zone)

⏱️ Timing

Total: 515ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`202.39.131.138`
NS	2	`ns.tradeserv.com, ns1.tradeserv.com`
MX	1	`coretech-optical.com (pri: 10)`
SOA	1	`ns.tradeserv.com root.ns.tradeserv.com`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns.tradeserv.com, ns1.tradeserv.com)

Analysis

Mail Server Role

For coretech-optical.com, the mail server is coretech-optical.com.

IP Addresses

coretech-optical.com resolves to one IP number: 202.39.131.138.

Other host names, for instance smtp.hibox.hinet.net, share IP numbers with coretech-optical.com.

Name Servers

coretech-optical.com is delegated to two name servers ns1.tradeserv.com and ns.tradeserv.com.

coretech-optical.com shares the same name server setup as other domains, for instance dtisanitary.com.tw, aao.tw, pintc.com, ycnail.com and jex-sports.com.

coretech-optical.com at least partially shares name servers with other domains, for instance k-pro.com.tw, tomato.co.id, 4seasons.tw, thinksmart.com.tw and pails.com.tw.

These name servers are commonly used alongside ns2.tradeserv.com and ns3.tradeserv.com.

Host names with one IP number:

ns1.tradeserv.com points to 210.65.244.135

ns.tradeserv.com points to 210.64.125.39

Mail Servers

coretech-optical.com is served by a single mail server, coretech-optical.com.

coretech-optical.com resolves to IP 202.39.131.138.

coretech-optical.com - robtex.com