`classroomoffice.com`

DNSSEC	⚠️ Not signed
A	35.172.94.1^{🇺🇸 Amazon35.168.0.0/13 EC2 IAD prefix}
		PTR	`staticip.multiscreensite.com`
NS	`ns1.systemdns.com` ⭐
		A	2604:4000:0:d:216:40:47:90^{🇨🇦 TUCOWS2604:4000::/48 -BRA-IPV6-BLK1.1/NET-2604:4000}
			PTR	`ns1.systemdns.com`
		A	216.40.47.90^{🇨🇦 TUCOWS216.40.47.0/24 -BRA-BLK1.4/NET-216-40-47-0}
			PTR	`ns1.systemdns.com`
NS	`ns2.systemdns.com`
		A	2604:4000:2800:d:64:99:148:16^{🇨🇦 TUCOWS-32604:4000:2800::/37 Tucows.com Co.}
			PTR	`ns2.systemdns.com`
		A	64.98.148.16^{🇨🇦 TUCOWS-364.98.144.0/20 Tucows.com Co.}
			PTR	`ns2.systemdns.com`
NS	`ns3.systemdns.com`
		A	2604:4000:0:d:64:99:96:36^{🇨🇦 TUCOWS2604:4000::/48 -BRA-IPV6-BLK1.1/NET-2604:4000}
			PTR	`ns3.systemdns.com`
		A	64.99.96.36^{🇨🇦 TUCOWS64.99.96.0/24 -BRA-BLK2.7.2}
			PTR	`ns3.systemdns.com`
MX	`mx.classroomoffice.com.cust.b.hostedemail.com` ⭐
		A	64.98.38.4^{🇨🇦 TUCOWS-364.98.38.0/24 IPv4 Allow}
			PTR	`mx.b.hostedemail.com`
TXT	`v=spf1 include:_spf.hostedemail.com ~all`
SOA	`ns1.systemdns.com`hostmaster@systemdns.com serial=1773356332

`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=1771291435

⚠️ On DNS blocklist: light, multi, pro, pro.plus, tif, ultimate

Same first word

classroomoffice.com

DNS History

5 records (5 active, 0 former)

●NSns1.systemdns.com2026-03-21 → 2026-03-23 · 2 obs

● 2026-03-21 22:02:16
● 2026-03-23 19:48:24

●NSns2.systemdns.com2026-03-21 → 2026-03-23 · 2 obs

● 2026-03-21 22:02:16
● 2026-03-23 19:48:24

●NSns3.systemdns.com2026-03-21 → 2026-03-23 · 2 obs

● 2026-03-21 22:02:16
● 2026-03-23 19:48:24

●MXmx.classroomoffice.com.cust.b.hostedemail.com2026-03-21 → 2026-03-23 · 2 obs

● 2026-03-21 22:02:16
● 2026-03-23 19:48:24

●A35.172.94.12026-03-21 → 2026-03-23 · 2 obs

● 2026-03-21 22:02:16
● 2026-03-23 19:48:24

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	k.gtld-servers.net, g.gtld-servers.net, i.gtld-servers.net, m.gtld-servers.net...	-
classroomoffice.com	ns1.systemdns.com, ns2.systemdns.com, ns3.systemdns.com	6 records

✅ Authoritative Response

Server:64.99.96.36

NS records: ns1.systemdns.com, ns2.systemdns.com, ns3.systemdns.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for classroomoffice.com (unsigned zone)

⏱️ Timing

Total: 207ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`35.172.94.1`
NS	3	`ns2.systemdns.com, ns3.systemdns.com...`
MX	1	`mx.classroomoffice.com.cust.b.hostedemai`
TXT	1	`v=spf1 include:_spf.hostedemail.com ~all`
SOA	1	`ns1.systemdns.com hostmaster.systemdns.c`

📌 Glue Records Collected

Total: 6

Out-of-bailiwick: 6 (ns1.systemdns.com, ns1.systemdns.com, ns2.systemdns.com...)

Analysis

IP Addresses

classroomoffice.com resolves to one IP number: 35.172.94.1.

other host names including nikiandfriends.com, dianehinman.org, kenleonardplumbing.com, materamaonline.com and majesticproperties.net share IP numbers with classroomoffice.com.

Name Servers

classroomoffice.com is delegated to three name servers ns1.systemdns.com, ns2.systemdns.com and ns3.systemdns.com.

classroomoffice.com at least partially shares name servers with other domains, for instance billingshardwarestore.com, rainsoftofpensacola.com, marcophotos.com, streamlinedesign.com and redblake.com.

Host names with two IP numbers:

ns1.systemdns.com points to: 2604:4000:0:d:216:40:47:90 and 216.40.47.90.

ns2.systemdns.com points to: 2604:4000:2800:d:64:99:148:16 and 64.98.148.16.

ns3.systemdns.com points to: 2604:4000:0:d:64:99:96:36 and 64.99.96.36.

Mail Servers

classroomoffice.com is handled by a single mail server, mx.classroomoffice.com.cust.b.hostedemail.com.

mx.classroomoffice.com.cust.b.hostedemail.com resolves to IP 64.98.38.4.

classroomoffice.com - robtex.com