`mail.officetutor.com`

DNSSEC	⚠️ Not signed
A	211.234.116.225^{🇰🇷 DACOM-NET211.234.0.0/17 contact jblee@aunet.nm.kr if necessary contact ojupark@aunet.nm.kr if necessary}
		PTR	`mail1.hanbiro.com`

`officetutor.com`

	DNSSEC	⚠️ Not signed
	A	211.234.110.140^{🇰🇷 DACOM-NET211.234.0.0/17 contact jblee@aunet.nm.kr if necessary contact ojupark@aunet.nm.kr if necessary}
	NS	`ns20.hanbiro.com` ⭐
	NS	`ns21.hanbiro.com`
	MX	`mail.officetutor.com` ⭐
	TXT	`v=spf1 a:mail.officetutor.com ip4:211.234.110.140 ip4:211.234.110.148 ip4:211...`
	SOA	`ns20.hanbiro.com`webmaster@hanbiro.com 2026-01-05 #7

WOT: SAFE (63/100)
WOT: SAFE (69/100)

PTR for

156.116.234.211.in-addr.arpa

MX for

officetutor.com

Same first word

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DNS History

2 records (1 active, 1 former)

○A211.234.116.1562007-11-27 → 2007-11-27 · 3 obs

● 2007-11-27 09:39:08
○ 2015-07-05 21:16:24
○ 2026-04-25 06:11:24

●A211.234.116.2252015-07-05 → 2026-04-25 · 3 obs

○ 2007-11-27 09:39:08
● 2015-07-05 21:16:24
● 2026-04-25 06:11:24

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	c.gtld-servers.net, d.gtld-servers.net, a.gtld-servers.net, f.gtld-servers.net...	-
officetutor.com	ns20.hanbiro.com, ns21.hanbiro.com	2 records

✅ Authoritative Response

Server:211.234.116.210

NS records: ns20.hanbiro.com, ns21.hanbiro.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for officetutor.com (unsigned zone)

⏱️ Timing

Total: 928ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`211.234.116.225`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns20.hanbiro.com, ns21.hanbiro.com)

Analysis

Mail Server Role

mail.officetutor.com handles mail for officetutor.com.

IP Addresses

mail.officetutor.com points to a single IP address: 211.234.116.225.

Other host names such as webmail.2dea.co.kr, mail.vjk.co.kr, mail1.hanbiro.com, mail.blackstonegames.com and mail.emti.or.kr share IPs with mail.officetutor.com.

mail.officetutor.com - robtex.com