`mail.besttech21.com`

	DNSSEC	⚠️ Not signed
	A	221.139.49.4^{🇰🇷 SKB-NET221.138.0.0/15 SK Broadband}

`besttech21.com`

	DNSSEC	⚠️ Not signed
	A	221.139.49.7^{🇰🇷 SKB-NET221.138.0.0/15 SK Broadband}
	NS	`ns1.nurihosting.com` ⭐
	NS	`ns1.web79.kr` ⚠️ Not in zone NS records
	NS	`ns2.web79.kr` ⚠️ Not in zone NS records
	MX	`mail.besttech21.com` ⭐
	TXT	`v=spf1 ip4:221.139.49.3 ip4:221.139.49.4 ip4:221.139.49.7 ip4:121.125.73.51 ...`
	SOA	`ns1.nurihosting.com`support@nurihosting.com 2023-01-26 #1

MX for

besttech21.com

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DNS History

1 record (1 active, 0 former)

●A221.139.49.42026-02-15 → 2026-03-29 · 2 obs

● 2026-02-15 03:10:36
● 2026-03-29 13:23:32

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	l.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net...	-
besttech21.com	ns1.web79.kr, ns2.web79.kr	-

✅ Authoritative Response

Server:121.125.73.38

NS records: ns1.web79.kr, ns2.web79.kr

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for besttech21.com (unsigned zone)

⏱️ Timing

Total: 2019ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`221.139.49.4`

Analysis

Mail Server Role

mail.besttech21.com functions as a mail server for besttech21.com.

IP Addresses

mail.besttech21.com points to IP number: 221.139.49.4.

Other host names such as mail.9988.tv, okbuild.kr, tfmuseum.org, mail.istarbeach.com and mail.yj120.kr share IPs with mail.besttech21.com.

mail.besttech21.com - robtex.com