`openbookteachers.com`

DNSSEC	⚠️ Not signed
A	4.193.67.176^{🇸🇬 Microsoft4.192.0.0/12 MICROSOFT}
NS	`ns1.itopplus.com` ⭐
		A	210.4.155.113^{🇹🇭 ITSC-AS210.4.144.0/20 Internet Thailand Company Ltd. 1768 IFCT Tower, 10th-12th FL IT Floor New Petchburi Road Khwaeng Bang Kapi Khet Huay Khwang}
NS	`ns.itopplus.com` ⚠️ Not in zone NS records
		A	43.255.104.115^{🇹🇭 HWCSNET43.255.104.0/22 HUAWEI INTERNATIONAL PTE. LTD. 15A Changi Business Park Central 1 Eightrium 03-03/04}
			PTR	`ecs-43-255-104-115.compute.hwclouds-dns.com`
NS	`ns2.itopplus.com`
		A	128.199.93.187^{🇸🇬 DIGITALOCEAN128.199.64.0/18 DigitalOcean}
MX	`mail.openbookteachers.com` ⭐
		A	27.254.86.88^{🇹🇭 CSLOX-IDC-AS-AP27.254.84.0/22 CS Loxinfo Public Company Limited 90 CW Tower A 17-20th floor Ratchadapisek Rd Huai Kwang}
			PTR	`asn8.hostneverdie.com`
TXT	`v=spf1 a mx ip4:27.254.86.88 ip4:27.254.82.179 ip4:210.1.60.117 ip4:27.254.66...`
SOA	`ns.itopplus.com`worawut@itopplus.com serial=1386877339

`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=1775973887

Same first word

openbookteachers.com

DNS History

8 records (5 active, 3 former)

○NScs42.hostingberry.com2016-12-18 → 2017-12-19 · 4 obs

● 2016-12-18 13:43:48
● 2017-12-19 16:43:50
○ 2026-04-08 14:46:56
○ 2026-04-12 06:17:52

○NScs42.hostneverdie.com2016-12-18 → 2017-12-19 · 4 obs

● 2016-12-18 13:43:48
● 2017-12-19 16:43:50
○ 2026-04-08 14:46:56
○ 2026-04-12 06:17:52

●NSns.itopplus.com2026-04-08 → 2026-04-12 · 3 obs

○ 2017-12-19 16:43:50
● 2026-04-08 14:46:56
● 2026-04-12 06:17:52

●NSns1.itopplus.com2026-04-08 → 2026-04-12 · 3 obs

○ 2017-12-19 16:43:50
● 2026-04-08 14:46:56
● 2026-04-12 06:17:52

●NSns2.itopplus.com2026-04-08 → 2026-04-12 · 3 obs

○ 2017-12-19 16:43:50
● 2026-04-08 14:46:56
● 2026-04-12 06:17:52

●MXmail.openbookteachers.com2016-12-18 → 2026-04-12 · 2 obs

● 2016-12-18 13:43:48
● 2026-04-12 06:17:52

○A27.254.85.842016-12-18 → 2017-12-19 · 4 obs

● 2016-12-18 13:43:48
● 2017-12-19 16:43:50
○ 2026-04-08 14:46:56
○ 2026-04-12 06:17:52

●A4.193.67.1762026-04-08 → 2026-04-12 · 3 obs

○ 2017-12-19 16:43:50
● 2026-04-08 14:46:56
● 2026-04-12 06:17:52

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	g.gtld-servers.net, m.gtld-servers.net, e.gtld-servers.net, c.gtld-servers.net...	-
openbookteachers.com	ns1.itopplus.com, ns2.itopplus.com	2 records

✅ Authoritative Response

Server:210.4.155.113

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for openbookteachers.com (unsigned zone)

⏱️ Timing

Total: 606ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`4.193.67.176`
NS	1	`ns1.itopplus.com`
MX	1	`mail.openbookteachers.com (pri: 10)`
TXT	1	`v=spf1 a mx ip4:27.254.86.88 ip4:27.254.`
SOA	1	`ns.itopplus.com worawut.itopplus.com`

📌 Glue Records Collected

Total: 2

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

Analysis

IP Addresses

openbookteachers.com points to an IP address: 4.193.67.176.

other host names include sritongec.com, siammicro.co.th, chyuanlih.com, prodrives.co.th and udppackaging.com; they share IP numbers with openbookteachers.com.

Name Servers

openbookteachers.com is delegated to three name servers ns1.itopplus.com, ns2.itopplus.com and ns.itopplus.com.

openbookteachers.com at least partially shares name servers with other domains, for instance sportsolution.co.th, ardex.co.th, xn--12cai0a1dqes9bpg5ncqbcb1k9lra.com, globaldynamics.co.th and benjaphanpong.com.

Host names with one IP:

ns1.itopplus.com points to 210.4.155.113; ns2.itopplus.com points to 128.199.93.187; ns.itopplus.com points to 43.255.104.115.

Mail Servers

openbookteachers.com is handled by a single mail server, mail.openbookteachers.com.

The host name mail.openbookteachers.com points to IP 27.254.86.88.

openbookteachers.com - robtex.com