`mail.alpha21.co.kr`

DNSSEC	⚠️ Not signed
A	223.130.85.51^{🇰🇷 DIRECT-AS-KR223.130.85.0/24}
		PTR	`sp-di-mh01.direct.co.kr`

`alpha21.co.kr`

	DNSSEC	⚠️ Not signed
	A	112.175.85.142^{🇰🇷 KT-NET112.168.0.0/13}
	NS	`alpha21.co.kr` ⭐
	NS	`ns.alpha21.co.kr` ⚠️ Not in parent delegation
	NS	`ns.bigtree.co.kr` ⚠️ Not in zone NS records
	NS	`ns1.alpha21.co.kr` ⚠️ Not in parent delegation
	NS	`ns1.bigtree.co.kr` ⚠️ Not in zone NS records
	NS	`ns2.alpha21.co.kr` ⚠️ Not in parent delegation
	NS	`ns2.bigtree.co.kr` ⚠️ Not in zone NS records
	NS	`ns3.alpha21.co.kr` ⚠️ Not in parent delegation
	NS	`ns3.bigtree.co.kr` ⚠️ Not in zone NS records
	MX	`mail.alpha21.co.kr` ⭐
	TXT	`v=spf1 include:_spf1.mailnara.co.kr include:_spf2.mailnara.co.kr include:_spf...`
	SOA	`alpha21.co.kr`postmaster@alpha21.co.kr serial=20160425

MX for

alpha21.co.kr

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DNS History

1 record (1 active, 0 former)

●A223.130.85.512013-09-04 → 2026-04-19 · 2 obs

● 2013-09-04 22:31:30
● 2026-04-19 23:38:22

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
kr	b.dns.kr, c.dns.kr, d.dns.kr, e.dns.kr...	-
alpha21.co.kr	ns3.bigtree.co.kr, ns2.bigtree.co.kr, ns.bigtree.co.kr, ns1.bigtree.co.kr	4 records

✅ Authoritative Response

Server:218.145.65.143

NS records: ns3.bigtree.co.kr, ns2.bigtree.co.kr, ns.bigtree.co.kr, ns1.bigtree.co.kr

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for alpha21.co.kr (unsigned zone)

⏱️ Timing

Total: 989ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`223.130.85.51`

📌 Glue Records Collected

Total: 4

Out-of-bailiwick: 4 (ns3.bigtree.co.kr, ns2.bigtree.co.kr, ns1.bigtree.co.kr...)

Analysis

Mail Server Role

mail.alpha21.co.kr functions as a mail server for alpha21.co.kr.

IP Addresses

mail.alpha21.co.kr resolves to one IP number: 223.130.85.51.

other host names including mail.greenchips.co.kr, mail.bgntech.com, mail.eabios.com, mail.nexicure.com and mail.stinsulation.com share IP numbers with mail.alpha21.co.kr.

mail.alpha21.co.kr - robtex.com