course.edu.vn - robtex.com

course.edu.vn

DNSSEC⚠️ Not signed
A2606:4700:3034::ac43:997b🇺🇸 Cloudflare2606:4700:3034::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3035::6815:346🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.3.70Cloudflare104.21.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.153.123🇺🇸 Cloudflare172.67.144.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NScoby.ns.cloudflare.com ⭐
A2606:4700:58::adf5:3b5c🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRcoby.ns.cloudflare.com
A2803:f800:50::6ca2:c15c🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRcoby.ns.cloudflare.com
A2a06:98c1:50::ac40:215c🇺🇸 Cloudflare2a06:98c1:50::/45
PTRcoby.ns.cloudflare.com
A108.162.193.92🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRcoby.ns.cloudflare.com
A172.64.33.92🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRcoby.ns.cloudflare.com
A173.245.59.92🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRcoby.ns.cloudflare.com
NSlinda.ns.cloudflare.com
A2606:4700:50::adf5:3afa🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRlinda.ns.cloudflare.com
A2803:f800:50::6ca2:c0fa🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRlinda.ns.cloudflare.com
A2a06:98c1:50::ac40:20fa🇺🇸 Cloudflare2a06:98c1:50::/45
PTRlinda.ns.cloudflare.com
A108.162.192.250🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRlinda.ns.cloudflare.com
A172.64.32.250🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRlinda.ns.cloudflare.com
A173.245.58.250🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRlinda.ns.cloudflare.com
MXmx1.privateemail.com ⭐
A162.255.118.7🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES
PTRmx1.privateemail.com
MXmx2.privateemail.com ⭐
A162.255.118.8🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES
PTRmx2.privateemail.com
TXTgoogle-site-verification=rKRjsbHsKIbrPjsgOs9vj1fcihqzWbEERx62tPJ5xZE
TXTv=spf1 include:spf.privateemail.com ~all
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.3.70, 172.67.153.123
IPv6 hints2606:4700:3034::ac43:997b, 2606:4700:3035::6815:346
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=114, name=cloudflare-ech.com
SOAcoby.ns.cloudflare.comdns@cloudflare.com serial=2403523401

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=2018564758

Subdomains

autoconfig.course.edu.vn

Same first word

course.co.za
course.org
course.world
course.dk
course.center
course.rs
course.work
course.link
course.ist
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course.is
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course.istanbul
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course.company
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course.it
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course.coach
course.pub
course.careers
course.chat
course.ru
course.online
course.co.uk
course.cc
course.fr
course.us
course.pro

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source.us
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DNS History

8 records (8 active, 0 former)

NScoby.ns.cloudflare.comlinda.ns.cloudflare.comMXmx1.privateemail.commx2.privateemail.comA104.21.3.70172.67.153.1232606:4700:3034::ac43:997b2606:4700:3035::6815:346
●NScoby.ns.cloudflare.com2026-05-01 → 2026-05-10 · 2 obs
● 2026-05-01 01:16:32
● 2026-05-10 02:25:34
●NSlinda.ns.cloudflare.com2026-05-01 → 2026-05-10 · 2 obs
● 2026-05-01 01:16:32
● 2026-05-10 02:25:34
●MXmx1.privateemail.com2026-05-01 → 2026-05-10 · 2 obs
● 2026-05-01 01:16:32
● 2026-05-10 02:25:34
●MXmx2.privateemail.com2026-05-01 → 2026-05-10 · 2 obs
● 2026-05-01 01:16:32
● 2026-05-10 02:25:34
●A104.21.3.702026-05-01 → 2026-05-10 · 2 obs
● 2026-05-01 01:16:32
● 2026-05-10 02:25:34
●A172.67.153.1232026-05-01 → 2026-05-10 · 2 obs
● 2026-05-01 01:16:32
● 2026-05-10 02:25:34
●A2606:4700:3034::ac43:997b2026-05-01 → 2026-05-10 · 2 obs
● 2026-05-01 01:16:32
● 2026-05-10 02:25:34
●A2606:4700:3035::6815:3462026-05-01 → 2026-05-10 · 2 obs
● 2026-05-01 01:16:32
● 2026-05-10 02:25:34

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
vna.dns-servers.vn, b.dns-servers.vn, c.dns-servers.vn, d.dns-servers.vn...-
course.edu.vnlinda.ns.cloudflare.com, coby.ns.cloudflare.com-

✅ Authoritative Response

Server:108.162.193.92

NS records: linda.ns.cloudflare.com, coby.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

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

⏱️ Timing

Total: 581ms | Queries: -

📄 Records

TypeCountSample Data
A2104.21.3.70, 172.67.153.123
AAAA22606:4700:3035::6815:346, 2606:4700:3034::ac43:997b
NS2coby.ns.cloudflare.com, linda.ns.cloudflare.com
MX2mx1.privateemail.com (pri: 10), mx2.privateemail.com (pri: 10)
TXT2google-site-verification=rKRjsbHsKIbrPjs, v=spf1 include:spf.privateemail.com ~all
HTTPS1{"priority":1,"target":".","alpn":["h3",
SOA1coby.ns.cloudflare.com dns.cloudflare.co

Analysis

Hierarchy

The parent of autoconfig.course.edu.vn is course.edu.vn.

IP Addresses

course.edu.vn maps to four IP numbers: 2606:4700:3034::ac43:997b, 2606:4700:3035::6815:346, 104.21.3.70 and 172.67.153.123.

Other host names, for instance nvy.eu, kioumourtzoglou.gr, desalescatholicschool.org, dated.co.nz and bdt1005.kjcrtp.com share IP numbers with course.edu.vn.

Name Servers

Two name servers coby.ns.cloudflare.com and linda.ns.cloudflare.com handle delegation for course.edu.vn.

course.edu.vn uses the same name server setup as other domains, for example kingsroom.bg, directpayments.org, steamcmd.net, siriussoftware.bg and theemotion(0x736578)pert.com.

course.edu.vn partially shares name servers with other domains; examples include 867755.com, lowsidemedia.com, shnocoo.com, proventmed.com and pjgblog.com.

these name servers are commonly used with the name servers jarred.ns.cloudflare.com.

Host names with six IP numbers: coby.ns.cloudflare.com points to: 2606:4700:58::adf5:3b5c, 2803:f800:50::6ca2:c15c, 2a06:98c1:50::ac40:215c, 108.162.193.92, 172.64.33.92 and 173.245.59.92; linda.ns.cloudflare.com points to: 2606:4700:50::adf5:3afa, 2803:f800:50::6ca2:c0fa, 2a06:98c1:50::ac40:20fa, 108.162.192.250, 172.64.32.250 and 173.245.58.250.

Mail Servers

course.edu.vn is handled by two mail servers: mx1.privateemail.com and mx2.privateemail.com.

course.edu.vn has the same mail server setup as other domains, including alliancegoods.com, ambaministries.com, jykcakes.com, elderlyfriend.com and brightable.com.

course.edu.vn shares some mail servers with other domains, at least partially, such as rentutk.com, pesashayo.com, timetableworld.com, lunasimaginarium.com and imperfectly-perfect.shop.

Host names with one IP number: The host name mx1.privateemail.com points to 162.255.118.7 and the host name mx2.privateemail.com points to 162.255.118.8.