ctech.edu.vn - robtex.com

ctech.edu.vn

DNSSEC⚠️ Not signed
A2606:4700:3031::6815:3654🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3033::ac43:88fc🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.54.84Cloudflare104.21.48.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.136.252🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSbrady.ns.cloudflare.com ⭐
A2606:4700:58::a29f:2cd7🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRbrady.ns.cloudflare.com
A2803:f800:50::6ca2:c3d7🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRbrady.ns.cloudflare.com
A2a06:98c1:50::ac40:23d7🇺🇸 Cloudflare2a06:98c1:50::/45
PTRbrady.ns.cloudflare.com
A108.162.195.215🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRbrady.ns.cloudflare.com
A162.159.44.215Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRbrady.ns.cloudflare.com
A172.64.35.215🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRbrady.ns.cloudflare.com
NSgrace.ns.cloudflare.com
A2606:4700:50::adf5:3a9f🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRgrace.ns.cloudflare.com
A2803:f800:50::6ca2:c09f🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRgrace.ns.cloudflare.com
A2a06:98c1:50::ac40:209f🇺🇸 Cloudflare2a06:98c1:50::/45
PTRgrace.ns.cloudflare.com
A108.162.192.159🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRgrace.ns.cloudflare.com
A172.64.32.159🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRgrace.ns.cloudflare.com
A173.245.58.159🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRgrace.ns.cloudflare.com
MXctech-edu-vn.mail.protection.outlook.com ⭐
A2a01:111:f403:cc09::🇸🇬 Microsoft2a01:111:f000::/36
PTRmail-sg2pr03cu00500.inbound.protection.outlook.com
A2a01:111:f403:cc1a::8🇯🇵 Microsoft2a01:111:f000::/36
PTRmail-tydpr03cu00100.inbound.protection.outlook.com
A2a01:111:f403:cc1f::4🇯🇵 Microsoft2a01:111:f000::/36
PTRmail-os8pr02cu00104.inbound.protection.outlook.com
A52.101.124.117🇯🇵 Microsoft52.96.0.0/12 MICROSOFT
PTRmail-tydpr03cu00105.inbound.protection.outlook.com
A52.101.137.0🇸🇬 Microsoft52.96.0.0/12 MICROSOFT
PTRmail-sg2pr03cu00500.inbound.protection.outlook.com
A52.101.157.80🇺🇸 Microsoft52.96.0.0/12 MICROSOFT
PTRmail-os8pr02cu00100.inbound.protection.outlook.com
TXTMS=ms71272379
TXTfacebook-domain-verification=2o02iv3646g882vmbragf7e6vi63cj
TXTgoogle-site-verification=NCZOmyxyK2JZADrW2lGjftvjXYg4kvb_S--hkCjuh2Q
TXTgoogle-site-verification=pjtM60V9F02xboNPOYjkEOuyDapJJou0ce20Hw-wfC0
TXTv=spf1 include:spf.protection.outlook.com -all
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.54.84, 172.67.136.252
IPv6 hints2606:4700:3031::6815:3654, 2606:4700:3033::ac43:88fc
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=139, name=cloudflare-ech.com
SOAbrady.ns.cloudflare.comdns@cloudflare.com serial=2403607903

edu.vn

DNSSEC⚠️ Not signed
NSdns-master.vnnic.vn ⭐
NSa.dns-servers.vn ⚠️ Not in parent delegation
NSb.dns-servers.vn ⚠️ Not in parent delegation
NSc.dns-servers.vn ⚠️ Not in parent delegation
NSd.dns-servers.vn ⚠️ Not in parent delegation
NSe.dns-servers.vn ⚠️ Not in parent delegation
NSf.dns-servers.vn ⚠️ Not in parent delegation
NSg.dns-servers.vn ⚠️ Not in parent delegation
NSh.dns-servers.vn ⚠️ Not in parent delegation
SOAdns-master.vnnic.vnpostmaster@vnnic.vn serial=2018565574

Subdomains

phanmem.ctech.edu.vn
hocbong.ctech.edu.vn
tuyensinh.ctech.edu.vn

Same first word

ctech.se
ctech.dk
ctech.nl
ctech.edu.vn
ctech.ge
ctech.ca
ctech.mx
ctech.cz
ctech.co.il
ctech.com.qa
ctech.net.br
ctech.com.mx
ctech.co.nz
ctech.net.in
ctech.jp
ctech.asia
ctech.co.za
ctech.ru
ctech.systems
ctech.cn
ctech.co
ctech.media
ctech.ac.za
ctech.net.cn
ctech.it
ctech.pl
ctech.co.kr
ctech.com.au
ctech.no-ip.biz
ctech.kz
ctech.com.cn
ctech.in
ctech.eu
ctech.us
ctech.com.tr
ctech.no
ctech.org
ctech.ch
ctech.vn
ctech.support
ctech.net
ctech.de
ctech.com
ctech.ac.th
ctech.com.ua
ctech.co.in

Similar names

chtec.com
tchec.com
chtec.org
tcche.org
chtec.ru
hctec.net
chtce.cn
ctche.cn
ehcct.edu.vn
chcte.com
thecc.com
thecc.nl
chetc.org.ua
hectc.shop
thecc.net
ethcc.org
hecct.com
htcce.com
techc.in
thcec.net
thecc.com.sg
chtec.de
hctec.co.kr
etchc.com
thecc.se
ectch.com
ethcc.us
hctec.de
techc.com
thecc.us
hccet.org
thecc.de
hctec.com.mx
tcche.com
thecc.at
techc.ru
chect.com
ethcc.io
chtec.com.br
chect.org.uk
ehctc.com
cecth.com
cceth.com
chetc.ck.ua
thecc.org
thecc.ws
ctche.com.cn
cthec.be
techc.de
thecc.biz
hctec.com
thecc.co
thecc.ca

DNS History

15 records (7 active, 8 former)

20162017201820192020202120222023202420252026NSbrady.ns.cloudflare.comgrace.ns.cloudflare.comns-master.inet.vnns1.bkdns.vnns1.inet.vnns2.bkdns.vnns2.inet.vnns3.bkdns.vnMXctech-edu-vn.mail.protection.outlook.comA104.21.54.84172.67.136.2522606:4700:3031::6815:36542606:4700:3033::ac43:88fc103.179.173.10123.30.50.111
●NSbrady.ns.cloudflare.com2026-05-08 → 2026-05-13 · 3 obs
○ 2026-05-06 02:40:20
● 2026-05-08 13:58:30
● 2026-05-13 05:47:34
●NSgrace.ns.cloudflare.com2026-05-08 → 2026-05-13 · 3 obs
○ 2026-05-06 02:40:20
● 2026-05-08 13:58:30
● 2026-05-13 05:47:34
○NSns-master.inet.vn2015-09-24 → 2015-12-21 · 4 obs
● 2015-09-24 07:37:24
● 2015-12-21 01:01:44
○ 2016-08-09 04:31:46
○ 2026-05-13 05:47:34
○NSns1.bkdns.vn2026-04-30 → 2026-05-06 · 7 obs
○ 2016-08-09 04:31:46
● 2026-04-30 19:35:22
○ 2026-04-30 22:56:26
● 2026-05-01 06:19:52
● 2026-05-06 02:40:20
○ 2026-05-08 13:58:30
○ 2026-05-13 05:47:34
○NSns1.inet.vn2015-09-24 → 2015-12-21 · 4 obs
● 2015-09-24 07:37:24
● 2015-12-21 01:01:44
○ 2016-08-09 04:31:46
○ 2026-05-13 05:47:34
○NSns2.bkdns.vn2026-04-30 → 2026-05-06 · 7 obs
○ 2016-08-09 04:31:46
● 2026-04-30 19:35:22
○ 2026-04-30 22:56:26
● 2026-05-01 06:19:52
● 2026-05-06 02:40:20
○ 2026-05-08 13:58:30
○ 2026-05-13 05:47:34
○NSns2.inet.vn2015-09-24 → 2015-12-21 · 4 obs
● 2015-09-24 07:37:24
● 2015-12-21 01:01:44
○ 2016-08-09 04:31:46
○ 2026-05-13 05:47:34
○NSns3.bkdns.vn2026-04-30 → 2026-05-06 · 7 obs
○ 2016-08-09 04:31:46
● 2026-04-30 19:35:22
○ 2026-04-30 22:56:26
● 2026-05-01 06:19:52
● 2026-05-06 02:40:20
○ 2026-05-08 13:58:30
○ 2026-05-13 05:47:34
●MXctech-edu-vn.mail.protection.outlook.com2026-04-30 → 2026-05-13 · 4 obs
● 2026-04-30 19:35:22
○ 2026-04-30 22:56:26
● 2026-05-01 06:19:52
● 2026-05-13 05:47:34
○A103.179.173.102026-04-30 → 2026-05-06 · 7 obs
○ 2016-08-09 04:31:46
● 2026-04-30 19:35:22
○ 2026-04-30 22:56:26
● 2026-05-01 06:19:52
● 2026-05-06 02:40:20
○ 2026-05-08 13:58:30
○ 2026-05-13 05:47:34
●A104.21.54.842026-05-08 → 2026-05-13 · 3 obs
○ 2026-05-06 02:40:20
● 2026-05-08 13:58:30
● 2026-05-13 05:47:34
○A123.30.50.1112015-05-16 → 2015-12-21 · 4 obs
● 2015-05-16 15:37:38
● 2015-12-21 01:01:44
○ 2016-08-09 04:31:46
○ 2026-05-13 05:47:34
●A172.67.136.2522026-05-08 → 2026-05-13 · 3 obs
○ 2026-05-06 02:40:20
● 2026-05-08 13:58:30
● 2026-05-13 05:47:34
●A2606:4700:3031::6815:36542026-05-08 → 2026-05-13 · 3 obs
○ 2026-05-06 02:40:20
● 2026-05-08 13:58:30
● 2026-05-13 05:47:34
●A2606:4700:3033::ac43:88fc2026-05-08 → 2026-05-13 · 3 obs
○ 2026-05-06 02:40:20
● 2026-05-08 13:58:30
● 2026-05-13 05:47:34

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
vne.dns-servers.vn, g.dns-servers.vn, b.dns-servers.vn, d.dns-servers.vn...-
ctech.edu.vnbrady.ns.cloudflare.com, grace.ns.cloudflare.com-

✅ Authoritative Response

Server:172.64.35.215

NS records: brady.ns.cloudflare.com, grace.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for ctech.edu.vn (unsigned zone)

⏱️ Timing

Total: 1453ms | Queries: -

📄 Records

TypeCountSample Data
A2172.67.136.252, 104.21.54.84
AAAA22606:4700:3031::6815:3654, 2606:4700:3033::ac43:88fc
NS2brady.ns.cloudflare.com, grace.ns.cloudflare.com
MX1ctech-edu-vn.mail.protection.outlook.com
TXT5MS=ms71272379, facebook-domain-verification=2o02iv3646g...
HTTPS1{"priority":1,"target":".","alpn":["h3",
SOA1brady.ns.cloudflare.com dns.cloudflare.c

Analysis

Hierarchy

ctech.edu.vn is the parent of phanmem.ctech.edu.vn, hocbong.ctech.edu.vn and tuyensinh.ctech.edu.vn.

IP Addresses

Four IP numbers are pointed to by ctech.edu.vn: 2606:4700:3031::6815:3654, 2606:4700:3033::ac43:88fc, 104.21.54.84 and 172.67.136.252.

other host names including suanming168.com, prohost.sa, ijunmeng.com, t.f732.cc and rm4.amazingviewsofthesmokies.com share IP numbers with ctech.edu.vn.

Name Servers

ctech.edu.vn is delegated to two name servers brady.ns.cloudflare.com and grace.ns.cloudflare.com.

ctech.edu.vn shares the same name server setup as other domains, for instance ctool.edu.vn, mikrotikwarehouse.ru, acumulado.com.br, brusselshotelsassociation.com and rcnavarra.org.

ctech.edu.vn at least partially shares name servers with other domains, for instance elaw911.com, dyrdekmachine.com, baraneks.com, twin24.ai and oxefuje.top.

These name servers are commonly used alongside pablo.ns.cloudflare.com and alexia.ns.cloudflare.com.

Host names with six IP numbers:

Host name brady.ns.cloudflare.com points to: 2606:4700:58::a29f:2cd7, 2803:f800:50::6ca2:c3d7, 2a06:98c1:50::ac40:23d7, 108.162.195.215, 162.159.44.215 and 172.64.35.215.

Host name grace.ns.cloudflare.com points to: 2606:4700:50::adf5:3a9f, 2803:f800:50::6ca2:c09f, 2a06:98c1:50::ac40:209f, 108.162.192.159, 172.64.32.159 and 173.245.58.159.

Mail Servers

ctech.edu.vn is handled by a single mail server, ctech-edu-vn.mail.protection.outlook.com.

The host name ctech-edu-vn.mail.protection.outlook.com resolves to six IP numbers: 2a01:111:f403:cc09::, 2a01:111:f403:cc1a::8, 2a01:111:f403:cc1f::4, 52.101.124.117, 52.101.137.0 and 52.101.157.80.