`tinhoahoc.com`

DNSSEC	⚠️ Not signed
A	192.161.49.130^{🇺🇸 HOSTPAPA-LA192.161.49.0/24 325 Delaware Avenue Suite 300 Buffalo NY 14202 United States}
		PTR	`mx1.advertisere.com`
NS	`ns1.tinhoahoc.com` ⭐ ⚠️ Not in parent delegation
		A	192.161.49.130^{🇺🇸 HOSTPAPA-LA192.161.49.0/24 325 Delaware Avenue Suite 300 Buffalo NY 14202 United States}
			PTR	`mx1.advertisere.com`
NS	`ns1.rynancrm.com` ⚠️ Not in zone NS records
		A	192.161.49.130^{🇺🇸 HOSTPAPA-LA192.161.49.0/24 325 Delaware Avenue Suite 300 Buffalo NY 14202 United States}
			PTR	`mx1.advertisere.com`
NS	`ns2.rynancrm.com` ⚠️ Not in zone NS records
		A	192.161.49.130^{🇺🇸 HOSTPAPA-LA192.161.49.0/24 325 Delaware Avenue Suite 300 Buffalo NY 14202 United States}
			PTR	`mx1.advertisere.com`
NS	`ns2.tinhoahoc.com` ⚠️ Not in parent delegation
		A	192.161.49.130^{🇺🇸 HOSTPAPA-LA192.161.49.0/24 325 Delaware Avenue Suite 300 Buffalo NY 14202 United States}
			PTR	`mx1.advertisere.com`
MX	`tinhoahoc.com` ⭐
		A	192.161.49.130^{🇺🇸 HOSTPAPA-LA192.161.49.0/24 325 Delaware Avenue Suite 300 Buffalo NY 14202 United States}
			PTR	`mx1.advertisere.com`
TXT	`v=spf1 ip4:192.161.49.130 include:vhost.vn +a +mx +ip4:69.12.77.90 +include:r...`
SOA	`ns1.tinhoahoc.com`root@server.server.com 2026-06-02 #1

`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=1785071197

MX for

mylangroup.com

tinhoahoc.com

Subdomains

ns2.tinhoahoc.com

ns1.tinhoahoc.com

server.tinhoahoc.com

Same first word

tinhoahoc.com

Similar names

tohochina.com

chinahoto.com

chinathoo.com

DNS History

9 records (6 active, 3 former)

●NSns1.rynancrm.com2026-03-10 → 2026-07-26 · 3 obs

○ 2015-05-21 16:14:28
● 2026-03-10 12:28:32
● 2026-07-26 13:27:16

●NSns1.tinhoahoc.com2015-05-21 → 2026-07-26 · 2 obs

● 2015-05-21 16:14:28
● 2026-07-26 13:27:16

●NSns2.rynancrm.com2026-03-10 → 2026-07-26 · 3 obs

○ 2015-05-21 16:14:28
● 2026-03-10 12:28:32
● 2026-07-26 13:27:16

●NSns2.tinhoahoc.com2015-05-21 → 2026-07-26 · 2 obs

● 2015-05-21 16:14:28
● 2026-07-26 13:27:16

○MXmail.b-io.co2020-02-06 → 2020-02-06 · 4 obs

○ 2017-03-25 14:09:32
● 2020-02-06 19:36:50
○ 2026-03-10 12:28:32
○ 2026-07-26 13:27:16

●MXtinhoahoc.com2015-05-21 → 2026-07-26 · 5 obs

● 2015-05-21 16:14:28
● 2017-03-25 14:09:32
○ 2020-02-06 19:36:50
● 2026-03-10 12:28:32
● 2026-07-26 13:27:16

●A192.161.49.1302026-03-10 → 2026-07-26 · 3 obs

○ 2020-02-06 19:36:50
● 2026-03-10 12:28:32
● 2026-07-26 13:27:16

○A208.91.197.1322020-02-06 → 2020-02-06 · 4 obs

○ 2017-03-25 14:09:32
● 2020-02-06 19:36:50
○ 2026-03-10 12:28:32
○ 2026-07-26 13:27:16

○A64.50.172.652015-05-21 → 2017-03-25 · 4 obs

● 2015-05-21 16:14:28
● 2017-03-25 14:09:32
○ 2020-02-06 19:36:50
○ 2026-07-26 13:27:16

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
tinhoahoc.com	ns1.rynancrm.com, ns2.rynancrm.com	2 records

✅ Authoritative Response

Server:192.161.49.130

NS records: ns1.rynancrm.com, ns2.rynancrm.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for tinhoahoc.com (unsigned zone)

⏱️ Timing

Total: 150ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`192.161.49.130`
NS	2	`ns2.tinhoahoc.com, ns1.tinhoahoc.com`
MX	1	`tinhoahoc.com (pri: 0)`
TXT	1	`v=spf1 ip4:192.161.49.130 include:vhost.`
SOA	1	`ns1.tinhoahoc.com root.server.server.com`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns1.rynancrm.com, ns2.rynancrm.com)

Analysis

Hierarchy

ns2.tinhoahoc.com, ns1.tinhoahoc.com and server.tinhoahoc.com are all subdomains of tinhoahoc.com.

Mail Server Role

Mail for mylangroup.com and tinhoahoc.com is handled by the mail server tinhoahoc.com.

IP Addresses

tinhoahoc.com has exactly one IP address — 192.161.49.130.

ns1.rynancrm.com, ns2.rynancrm.com, ns2.tinhoahoc.com plus two other host names have IP numbers in common with tinhoahoc.com.

Name Servers

Four name servers handle the delegation for tinhoahoc.com: ns1.rynancrm.com, ns2.rynancrm.com, ns1.tinhoahoc.com and ns2.tinhoahoc.com.

The name servers for tinhoahoc.com overlap at least in part with those of other domains, including rynancrm.com and server.tinhoahoc.com.

The host names ns1.rynancrm.com, ns2.rynancrm.com, ns1.tinhoahoc.com and ns2.tinhoahoc.com share a common IP address: 192.161.49.130.

The following host names resolve to 192.161.49.130: ns1.rynancrm.com, ns2.rynancrm.com, ns1.tinhoahoc.com and ns2.tinhoahoc.com.

Mail Servers

tinhoahoc.com uses exactly one mail server, which is tinhoahoc.com.

tinhoahoc.com uses the same mail servers as other domains, including mylangroup.com.

There is one IP number for tinhoahoc.com: 192.161.49.130.

tinhoahoc.com - robtex.com

tinhoahoc.com

com