`ybmclass.com`

DNSSEC	⚠️ Not signed
A	203.231.233.185^{🇰🇷 INETHOSTING-AS-KR203.231.233.0/24}
NS	`sisadns131` ⭐
NS	`ns.ybmsisa.com` ⚠️ Not in zone NS records
		A	203.231.233.131^{🇰🇷 INETHOSTING-AS-KR203.231.233.0/24}
NS	`ns2.ybmsisa.com`
		A	3.37.56.90^{🇰🇷 Amazon3.36.0.0/14 EC2 ICN prefix}
			PTR	`ec2-3-37-56-90.ap-northeast-2.compute.amazonaws.com`
SOA	`sisadns131`hostmaster serial=35

`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=1785033032

rank #851223 globally
rank #368431 in the tld

Subdomains

japan.ybmclass.com

my.ybmclass.com

free.ybmclass.com

toeic.ybmclass.com

Same first word

ybmclass.com

Similar names

samsclyb.com

DNS History

5 records (4 active, 1 former)

●NSns.ybmsisa.com2015-05-08 → 2026-07-26 · 3 obs

○ 2008-03-07 05:13:06
● 2015-05-08 07:35:02
● 2026-07-26 02:38:38

●NSns2.ybmsisa.com2026-02-28 → 2026-07-26 · 3 obs

○ 2015-05-08 07:35:02
● 2026-02-28 22:46:48
● 2026-07-26 02:38:38

●NSsisadns1312015-05-08 → 2026-07-26 · 3 obs

○ 2008-03-07 05:13:06
● 2015-05-08 07:35:02
● 2026-07-26 02:38:38

●A203.231.233.1852015-10-19 → 2026-07-26 · 3 obs

○ 2015-05-08 07:35:02
● 2015-10-19 21:49:36
● 2026-07-26 02:38:38

○A203.231.233.2142015-05-08 → 2015-05-08 · 4 obs

○ 2008-03-07 05:13:06
● 2015-05-08 07:35:02
○ 2015-10-19 21:49:36
○ 2026-07-26 02:38:38

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	f.gtld-servers.net, l.gtld-servers.net, k.gtld-servers.net, g.gtld-servers.net...	-
ybmclass.com	ns.ybmsisa.com, ns2.ybmsisa.com	2 records

✅ Authoritative Response

Server:3.37.56.90

NS records: ns.ybmsisa.com, ns2.ybmsisa.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for ybmclass.com (unsigned zone)

⏱️ Timing

Total: 643ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`203.231.233.185`
NS	1	`ns.ybmsisa.com`
SOA	1	`sisadns131 hostmaster`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns.ybmsisa.com, ns2.ybmsisa.com)

Analysis

Hierarchy

ybmclass.com serves as the parent of japan.ybmclass.com, my.ybmclass.com, free.ybmclass.com and toeic.ybmclass.com.

IP Addresses

ybmclass.com resolves to one IP address: 203.231.233.185.

toeic.ybmclass.com, e4u.com, japan.ybmclass.com and two other host names share IP numbers with ybmclass.com.

Name Servers

ybmclass.com has three name servers — sisadns131, ns2.ybmsisa.com and ns.ybmsisa.com.

ybmclass.com has at least partial name server overlap with other domains, such as ybmuniv.com, wbook.co.kr, sisaphone.com and two others.

It is common to find these name servers paired with the name servers ns.ybmsisa.co.kr, ns2.ybmsisa.co.kr, ns2.ybm.co.kr and ns.ybm.co.kr.

ns2.ybmsisa.com directs to 3.37.56.90 and ns.ybmsisa.com directs to 203.231.233.131; each host name points to exactly one IP number.

ybmclass.com - robtex.com

ybmclass.com

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