`mail.dco.com`

DNSSEC	⚠️ Not signed
A	211.53.177.11^{🇰🇷 DACOM-NET211.53.0.0/16 contact noc@bora.net if necessary}
		PTR	`mail1.dco.com`

`dco.com`

	DNSSEC	⚠️ Not signed
	A	121.156.99.131^{🇰🇷 KT-NET121.152.0.0/13}
	NS	`ns1.gabia.co.kr` ⭐ ⚠️ Not in zone NS records
	NS	`ns-1318.awsdns-36.org`
	NS	`ns-1733.awsdns-24.co.uk`
	NS	`ns-70.awsdns-08.com`
	NS	`ns-900.awsdns-48.net`
	NS	`ns.gabia.co.kr` ⚠️ Not in zone NS records
	NS	`ns.gabia.net` ⚠️ Not in zone NS records
	MX	`dco-com.mail.protection.outlook.com` ⭐
	TXT	`MS=F440221106266C6D4A8E5E82DFB138A1553DE20A`
	TXT	`MS=ms69881389`
	TXT	`_9deg4uma40s6ze95h51fw73u4hzwh2w`
	TXT	`asv=8c1f394ec68dd4cc199719bcf5769083`
	TXT	`google-site-verification=X0QYwfB4qx5qe6uCMR0ucEEskU4Cmi6vsL7oaaGBVtg`
	TXT	`v=spf1 ip4:121.156.99.165 include:spf.protection.outlook.com ~all`
	SOA	`ns.gabia.co.kr`hosting@gabia.com 2021-01-05 #16

Same first word

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DNS History

2 records (1 active, 1 former)

○A211.189.165.1012015-08-23 → 2016-07-09 · 4 obs

● 2015-08-23 09:53:26
● 2016-07-09 12:46:22
○ 2026-03-22 00:38:16
○ 2026-08-12 20:58:00

●A211.53.177.112026-03-22 → 2026-08-12 · 3 obs

○ 2016-07-09 12:46:22
● 2026-03-22 00:38:16
● 2026-08-12 20:58:00

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	j.gtld-servers.net, a.gtld-servers.net, l.gtld-servers.net, c.gtld-servers.net...	-
dco.com	ns.gabia.co.kr, ns1.gabia.co.kr, ns.gabia.net, ns-70.awsdns-08.com...	2 records

✅ Authoritative Response

Server:43.201.170.100

NS records: ns.gabia.co.kr, ns1.gabia.co.kr, ns.gabia.net, ns-70.awsdns-08.com, ns-900.awsdns-48.net, ns-1733.awsdns-24.co.uk, ns-1318.awsdns-36.org

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for dco.com (unsigned zone)

⏱️ Timing

Total: 1262ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`211.53.177.11`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns-70.awsdns-08.com, ns-70.awsdns-08.com)

Analysis

IP Addresses

mail.dco.com points to a single IP number: 211.53.177.11.

Host names such as mail1.dco.com, mail1.decemberco.com and mail1.fint.co.kr share their IP numbers with mail.dco.com.

mail.dco.com - robtex.com

mail.dco.com

dco.com