classroom.cz - robtex.com

classroom.cz

DNSSEC🔒 Signed (DS record present)
A37.9.175.165🇸🇰 WEBSUPPORT-SRO-SK-AS37.9.175.0/24
PTRing.r3.websupport.sk
NSns1.websupport.cz ⭐
A2a10:bbc0::11🇨🇿 ACTIVE24-AS2a10:bbc0::/32
PTRns1.websupport.eu
A45.10.97.11🇨🇿 ACTIVE24-AS45.10.97.0/24
PTRns1.websupport.eu
NSns2.websupport.cz
A2a02:250:3::12🇸🇪 ACTIVE24-AS2a02:250:3::/48
PTRns2.websupport.eu
A185.71.159.12🇸🇪 ACTIVE24-AS185.71.159.0/24
PTRns2.websupport.eu
NSns3.websupport.eu
A2a10:bbc0::13🇨🇿 ACTIVE24-AS2a10:bbc0::/32
PTRns3.websupport.eu
A45.10.97.13🇨🇿 ACTIVE24-AS45.10.97.0/24
PTRns3.websupport.eu
MXmxgw.plus4u.net ⭐
A90.183.125.20🇨🇿 O2-CZECH-REPUBLIC90.183.0.0/16
PTRmxgw.plus4u.net
TXTv=spf1 a mx a:smtp.plus4u.net ~all
TXTv=DMARC1; p=none; rua=mailto:abuse@classroom.cz; fo=1
SOAns1.websupport.czadmin@websupport.cz serial=1780618493

cz

DNSSEC🔒 Signed (DS record present)
NSa.ns.nic.cz ⭐
NSb.ns.nic.cz
NSc.ns.nic.cz
NSd.ns.nic.cz
SOAa.ns.nic.czhostmaster@nic.cz serial=1784017053

Same first word

classroom.technology
classroom.life
classroom.co
classroom.global
classroom.freetls.fastly.net
classroom.cc
classroom.it.com
classroom.digital
classroom.nyc
classroom.org
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classroom.at
classroom.school
classroom.gov.ng
classroom.management
classroom.be
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classroom.la
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classroom.solar
classroom.cloud
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classroom.solutions
classroom.com.hk
classroom.id
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classroom.ai
classroom.pl
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classroom.es
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classroom.de
classroom.college
classroom.lol
classroom.com.ar
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classroom.global.ssl.fastly.net
classroom.pro
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classroom.cz
classroom.network
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classroom.dk
classroom.cl
classroom.place
classroom.se
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classroom.com.au
classroom.cafe
classroom.nl
classroom.si
classroom.im
classroom.leadpages.co
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classroom.online
classroom.kz

Similar names

mssolarco.org
mssolarco.net
carolmoss.com
losmarcos.com.mx
moscorals.ru
losmarcos.com
masscolor.com
classmoor.com
colormass.com
clasrooms.com
roomclass.com
losmarcos.mx
mssolarco.com

DNS History

10 records (5 active, 5 former)

20162017201820192020202120222023202420252026NSns1.websupport.czns2.websupport.czns3.websupport.eualfa.ns.active24.czbeta.ns.active24.czgama.ns.active24.skMXmxgw.plus4u.netmxgw1.unicornuniverse.eumxgw2.unicornuniverse.euA37.9.175.165
○NSalfa.ns.active24.cz2015-08-10 → 2017-03-21 · 4 obs
● 2015-08-10 11:42:14
● 2017-03-21 16:11:32
○ 2026-06-13 06:38:16
○ 2026-07-14 08:29:44
○NSbeta.ns.active24.cz2015-08-10 → 2017-03-21 · 4 obs
● 2015-08-10 11:42:14
● 2017-03-21 16:11:32
○ 2026-06-13 06:38:16
○ 2026-07-14 08:29:44
○NSgama.ns.active24.sk2015-08-10 → 2017-03-21 · 4 obs
● 2015-08-10 11:42:14
● 2017-03-21 16:11:32
○ 2026-06-13 06:38:16
○ 2026-07-14 08:29:44
●NSns1.websupport.cz2026-06-13 → 2026-07-14 · 3 obs
○ 2017-03-21 16:11:32
● 2026-06-13 06:38:16
● 2026-07-14 08:29:44
●NSns2.websupport.cz2026-06-13 → 2026-07-14 · 3 obs
○ 2017-03-21 16:11:32
● 2026-06-13 06:38:16
● 2026-07-14 08:29:44
●NSns3.websupport.eu2026-06-13 → 2026-07-14 · 3 obs
○ 2017-03-21 16:11:32
● 2026-06-13 06:38:16
● 2026-07-14 08:29:44
●MXmxgw.plus4u.net2026-06-13 → 2026-07-14 · 3 obs
○ 2017-03-21 16:11:32
● 2026-06-13 06:38:16
● 2026-07-14 08:29:44
○MXmxgw1.unicornuniverse.eu2015-08-10 → 2017-03-21 · 4 obs
● 2015-08-10 11:42:14
● 2017-03-21 16:11:32
○ 2026-06-13 06:38:16
○ 2026-07-14 08:29:44
○MXmxgw2.unicornuniverse.eu2015-08-10 → 2017-03-21 · 4 obs
● 2015-08-10 11:42:14
● 2017-03-21 16:11:32
○ 2026-06-13 06:38:16
○ 2026-07-14 08:29:44
●A37.9.175.1652026-06-13 → 2026-07-14 · 2 obs
● 2026-06-13 06:38:16
● 2026-07-14 08:29:44

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
cza.ns.nic.cz, c.ns.nic.cz, b.ns.nic.cz, d.ns.nic.cz-
classroom.czns1.websupport.cz, ns2.websupport.cz, ns3.websupport.eu-

✅ Authoritative Response

Server:45.10.97.11

NS records: ns1.websupport.cz, ns2.websupport.cz, ns3.websupport.eu

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 1042ms | Queries: -

📄 Records

TypeCountSample Data
A137.9.175.165
NS3ns1.websupport.cz, ns2.websupport.cz...
MX1mxgw.plus4u.net (pri: 10)
TXT2v=spf1 a mx a:smtp.plus4u.net ~all, v=DMARC1; p=none; rua=mailto:abuse@class
SOA1ns1.websupport.cz admin.websupport.cz

Analysis

IP Addresses

classroom.cz has exactly one IP address — 37.9.175.165.

novedubce.cz, gw.palac-krizik.cz, qline.eu plus two other host names have IP numbers in common with classroom.cz.

Name Servers

DNS for classroom.cz is handled by three authoritative name servers: ns1.websupport.cz, ns2.websupport.cz and ns3.websupport.eu.

At least some of classroom.cz's name servers are shared with other domains, for example chriss-elite.cz, alfanametal.cz, kinesiotaping.sk and two more.

Three hostnames — ns1.websupport.cz, ns2.websupport.cz and ns3.websupport.eu — each have two IP addresses: ns1.websupport.cz has 45.10.97.11 and 2a10:bbc0::11, ns2.websupport.cz has 185.71.159.12 and 2a02:250:3::12, and ns3.websupport.eu has 45.10.97.13 and 2a10:bbc0::13.

Mail Servers

classroom.cz uses one mail server — mxgw.plus4u.net.

The mail server setup of classroom.cz matches that of other domains such as cyberworld.cz, vigtravel.cz, vigdata.cz and two others.

mxgw.plus4u.net has exactly one IP number: 90.183.125.20.