mail.contuhoc.com - robtex.com

mail.contuhoc.com

CNAMEcontuhoc.com
DNSSEC⚠️ Not signed
A125.212.225.155🇻🇳 VTDC-AS-VN125.212.225.0/24 VIETTEL-VN
NSnsbak.pavietnam.net ⭐
A2406:9c80::9000:302🇻🇳 SUPERDATA2406:9c80::/48 -VN
PTRnsbak.dotvndns.com
A112.213.89.22🇻🇳 SUPERDATA112.213.89.0/24 Vietnam Internet Network Information Center (VNNIC) 18 Nguyen Du Str, Hai Ba Trung District, Hanoi City, Vietnam 24th floor, VNTA Tower, Duong Dinh Nghe, Cau Giay, Hanoi
PTRns8922.dotvndns.vn
NSns1.pavietnam.vn
A2406:9c80::66🇻🇳 SUPERDATA2406:9c80::/48 -VN
PTRns1.dotvndns.vn
A112.213.89.3🇻🇳 SUPERDATA112.213.89.0/24 Vietnam Internet Network Information Center (VNNIC) 18 Nguyen Du Str, Hai Ba Trung District, Hanoi City, Vietnam 24th floor, VNTA Tower, Duong Dinh Nghe, Cau Giay, Hanoi
PTRns1.dotvndns.vn
NSns2.pavietnam.vn
A2406:9c80::9000:111🇻🇳 SUPERDATA2406:9c80::/48 -VN
PTRns2.dotvndns.vn
A222.255.121.247🇻🇳 VDC222.255.121.0/24 VNPT
PTRstatic.vdc.vn
PTRstatic.vnpt.vn
MXaspmx.l.google.com ⭐
A2607:f8b0:4004:c08::1a🇺🇸 Google2607:f8b0:4004::/48
PTRbi-in-f26.1e100.net
A64.233.180.26🇺🇸 Google64.233.180.0/24
PTRon-in-f26.1e100.net
PTRpe-in-f26.1e100.net
MXalt1.aspmx.l.google.com(5)
A2800:3f0:4003:c0f::1a🇨🇱 Google2800:3f0:4003::/48
A108.177.123.27🇺🇸 Google108.177.123.0/24
PTRlcscld-in-f27.1e100.net
MXalt2.aspmx.l.google.com(5)
A2a00:1450:400b:c02::1a🇮🇪 Google2a00:1450:400b::/48
PTRdj-in-f26.1e100.net
A172.253.116.27🇺🇸 Google172.253.116.0/24
PTRdj-in-f27.1e100.net
MXalt3.aspmx.l.google.com(10)
A2a00:1450:4009:c0f::1a🇬🇧 Google2a00:1450:4009::/48
PTRyulhrs-in-f26.1e100.net
A192.178.223.26🇺🇸 Google192.178.223.0/24
PTRyulhrs-in-f26.1e100.net
MXalt4.aspmx.l.google.com(10)
A2607:f8b0:4001:c70::1b🇺🇸 Google2607:f8b0:4001::/48
PTRyucbful-in-f27.1e100.net
A192.178.209.26🇺🇸 Google192.178.209.0/24
PTRyucbful-in-f26.1e100.net
TXTv=spf1 ip4:125.212.225.155 include:_spf.google.com ~all
TXTgoogle-site-verification=9bF83dtpLaKvQuQlQvgk-BBvuddHUxIkpRrb4tJjgfE
SOAnsbak.pavietnam.nethostmaster@contuhoc.com 2026-04-29 #51

contuhoc.com

DNSSEC⚠️ Not signed
A125.212.225.155🇻🇳 VTDC-AS-VN125.212.225.0/24 VIETTEL-VN
NSnsbak.pavietnam.net ⭐
NSns1.pavietnam.vn
NSns2.pavietnam.vn
MXaspmx.l.google.com ⭐
MXalt1.aspmx.l.google.com(5)
MXalt2.aspmx.l.google.com(5)
MXalt3.aspmx.l.google.com(10)
MXalt4.aspmx.l.google.com(10)
TXTv=spf1 ip4:125.212.225.155 include:_spf.google.com ~all
TXTgoogle-site-verification=9bF83dtpLaKvQuQlQvgk-BBvuddHUxIkpRrb4tJjgfE
SOAnsbak.pavietnam.nethostmaster@contuhoc.com 2026-04-29 #51

Previously MX for

mail.contuhoc.com
contuhoc.com

Same first word

mail.sl
mail.gov.mu
mail.gov.in
mail.uz
mail.clinic
mail.bm
mail.com.pk
mail.hl.cn
mail.nhs.uk
mail.hotmail
mail.gov.om
mail.canon
mail.net.hk
mail.as
mail.ir
mail.net.ru
mail.cz
mail.so
mail.ind.in
mail.com.in
mail.noip.us
mail.hippy.jp
mail.eating-organic.net
mail.ba.gov.br
mail.com
mail.inf.br
mail.4u.com
mail.edu.tw
mail.dnsalias.net
mail.pro.br
mail.ne.jp
mail.co.jp
mail.be
mail.com.vn
mail.how
mail.in-brb.de
mail.ro
mail.com.hk
mail.neustar
mail.ao
mail.pw
mail.broker
mail.school
mail.land
mail.yahoo
mail.edu.ge
mail.ps
mail.edu.ee
mail.gouv.ci
mail.gi
mail.fr
mail.mil.id
mail.k12.vt.us
mail.photos
mail.omg.lol
mail.ooo
mail.cloudaccess.net
mail.girly.jp
mail.ec
mail.blog
mail.potager.org
mail.v.ua
mail.copro.uk
mail.or.id
mail.kim
mail.md
mail.gov.ls
mail.edu.tt
mail.si
mail.gov.rw
mail.gov.bs
mail.ca
mail.je
mail.ks.ua
mail.org.br
mail.technology
mail.edu.ru
mail.edu.az
mail.global
mail.bambina.jp
mail.hu.net
mail.whitesnow.jp
mail.se
mail.keymachine.de
mail.gd
mail.ms.gov.br
mail.csx.cc
mail.basicserver.io
mail.coupons
mail.js.org
mail.ch
mail.partners
mail.mt
mail.golffan.us
mail.town
mail.sh
mail.nom.za
mail.com.br
mail.com.ph
mail.co.ua

Similar names

mail.support
ilam.org.tr
mail.de
mail.hacca.jp
mail.moo.jp
almi.ru
liam.nu
mail.new
amil.gal
imal.org.mx
mail.teva
mail.gov.al
mail.kapsi.fi
mail.cutegirl.jp
mali.com
mail.gov.az
mail.io
mail.cash
mail.eus
mail.firewall-gateway.com
mali.ru
amli.kommune.no
mlai.melbourne
mail.pro
mail.pupu.jp
mail.vivian.jp
mila.fi
mail.df.gov.br
mail.ci
mali.nl
mail.chirurgiens-dentistes.fr
mail.frenchkiss.jp
mail.blogspot.be
amli.fr
ilam.in
mail.go.kr
almi.odessa.ua
almi.mobi
mail.my-gateway.de
mail.wedding
mail.za.bz
lima.city
almi.shop
mail.to
mail.tf
iaml.org
mail.ba
almi.com.br
mail.lviv.ua
amil.cn
mail.ki
mali.at
mila.ca
liam.biz
mail.lima-city.de
mail.mysecuritycamera.com
mail.microsoft
mail.mil.tw
mail.org.in
mail.deals
lami.at
mila.quebec
amli.work
mail.edu.pl
ilma.lt
mail.cfolks.pl
mail.cm
mail.go.th
alim.biz
mail.mil.cn
mail.poivron.org
lami.com.co
mail.dnshome.de
mail.jp
mail.mp
mail.ac
mail.fund
lima.world
mail.edu.bi
almi.de
mail.uk.com
mail.mysecuritycamera.net
iaml.dj
mila.co.uk
lima.co.za
mali.cc
mail.glass
mail.mil.kg
imal.net
mail.dog
amil.world
mail.ddns.me
mail.gov.bh
mail.tours
mila.nu
mail.no-ip.info
mail.na
mail.gov.cl
mial.net
mila.te.ua

DNS History

5 records (1 active, 4 former)

20162017201820192020202120222023202420252026NSns1.pavietnam.vnns2.pavietnam.vnMXmail.contuhoc.comA103.28.39.101CNAMEcontuhoc.com
○NSns1.pavietnam.vn2015-10-22 → 2016-05-03 · 4 obs
● 2015-10-22 16:25:08
● 2016-05-03 07:36:54
○ 2026-02-24 01:24:10
○ 2026-05-09 18:02:40
○NSns2.pavietnam.vn2015-10-22 → 2016-05-03 · 4 obs
● 2015-10-22 16:25:08
● 2016-05-03 07:36:54
○ 2026-02-24 01:24:10
○ 2026-05-09 18:02:40
○MXmail.contuhoc.com2015-10-22 → 2016-05-03 · 4 obs
● 2015-10-22 16:25:08
● 2016-05-03 07:36:54
○ 2026-02-24 01:24:10
○ 2026-05-09 18:02:40
○A103.28.39.1012015-05-30 → 2016-05-03 · 4 obs
● 2015-05-30 14:23:30
● 2016-05-03 07:36:54
○ 2026-02-24 01:24:10
○ 2026-05-09 18:02:40
●CNAMEcontuhoc.com2015-05-30 → 2026-05-09 · 2 obs
● 2015-05-30 14:23:30
● 2026-05-09 18:02:40

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
comi.gtld-servers.net, e.gtld-servers.net, m.gtld-servers.net, g.gtld-servers.net...-
contuhoc.comnsbak.pavietnam.net, ns1.pavietnam.vn, ns2.pavietnam.vn-

✅ Authoritative Response

Server:112.213.89.22

NS records: nsbak.pavietnam.net, ns1.pavietnam.vn, ns2.pavietnam.vn

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for contuhoc.com (unsigned zone)

⏱️ Timing

Total: 1640ms | Queries: -

📄 Records

TypeCountSample Data
CNAME1contuhoc.com

Analysis

IP Addresses

mail.contuhoc.com points to a single IP address: 125.212.225.155.

Other host names such as tak12.com, www.contuhoc.com, quiz.contuhoc.com, contuhoc.com and tienganhk12.com share IP numbers with mail.contuhoc.com.

Name Servers

mail.contuhoc.com is delegated to three name servers: nsbak.pavietnam.net, ns1.pavietnam.vn and ns2.pavietnam.vn.

At least part of the name servers for mail.contuhoc.com are shared with other domains, for instance dohaco.com, mppack.com.vn, dd-com.com, diamondlotusrome.com and belengineering.vn.

These name servers are often used together with ns1.dotvndns.vn, ns2.dotvndns.vn and nsbak.dotvndns.com.

Host names with two IP numbers:

nsbak.pavietnam.net points to 2406:9c80::9000:302 and 112.213.89.22

ns1.pavietnam.vn points to 2406:9c80::66 and 112.213.89.3

ns2.pavietnam.vn points to 2406:9c80::9000:111 and 222.255.121.247

Mail Servers

mail.contuhoc.com is handled by five mail servers: aspmx.l.google.com, alt1.aspmx.l.google.com, alt2.aspmx.l.google.com, alt3.aspmx.l.google.com and alt4.aspmx.l.google.com.

mail.contuhoc.com shares at least some mail servers with other domains, for example vongbilonghai.com, aemavat.com, nolose.cl, ns500731.ns500671.ns500754.ns500742.ns500704.ns500742.ns500704.ns500704.ns500705.ns500688.ns500678.ns500678.ns500649.ns500649.ns500153.tenderladiesbz.com and ns500754.ns500671.ns500731.ns500671.ns500671.ns500731.ns500671.ns500705.ns500671.ns500649.ns500688.ns500291.ns500291.ns500153.tenderladiesbz.com.

These mail servers are commonly used alongside aspmx2.googlemail.com, aspmx3.googlemail.com, aspmx4.googlemail.com and aspmx5.googlemail.com.

Host names with two IP numbers: aspmx.l.google.com points to 2607:f8b0:4004:c08::1a and 64.233.180.26; alt1.aspmx.l.google.com points to 2800:3f0:4003:c0f::1a and 108.177.123.27; alt2.aspmx.l.google.com points to 2a00:1450:400b:c02::1a and 172.253.116.27; alt3.aspmx.l.google.com points to 2a00:1450:4009:c0f::1a and 192.178.223.26; alt4.aspmx.l.google.com points to 2607:f8b0:4001:c70::1b and 192.178.209.26.