`ducid.openlearning.edu.vn`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::ac43:acba^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3031::6815:1e63^{🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.30.99^{Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.172.186^{🇺🇸 Cloudflare172.67.160.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.30.99, 172.67.172.186
		IPv6 hints	2606:4700:3030::ac43:acba, 2606:4700:3031::6815:1e63
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=108, name=cloudflare-ech.com

`openlearning.edu.vn`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::ac43:acba^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3031::6815:1e63^{🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.30.99^{Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.172.186^{🇺🇸 Cloudflare172.67.160.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`angela.ns.cloudflare.com` ⭐
NS	`toby.ns.cloudflare.com`
MX	`aspmx.l.google.com` ⭐
MX	`alt1.aspmx.l.google.com`⁽⁵⁾
MX	`alt2.aspmx.l.google.com`⁽⁵⁾
MX	`alt3.aspmx.l.google.com`⁽¹⁰⁾
MX	`alt4.aspmx.l.google.com`⁽¹⁰⁾
TXT	`ca3-fd8cb94f36254132bb51b08742a487e1`
TXT	`google-site-verification=39evECCU9AmkGN64QzX0bdpUR78xEH9DaFlC4CGEQhw`
TXT	`google-site-verification=XdyNg3w3d_Pl4HWIQ-19p_x8fBmkvunxbhWMRuwotDk`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.30.99, 172.67.172.186
		IPv6 hints	2606:4700:3030::ac43:acba, 2606:4700:3031::6815:1e63
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=108, name=cloudflare-ech.com
SOA	`angela.ns.cloudflare.com`dns@cloudflare.com serial=2403586217

Similar names

diduc.com

cuddi.pl

dcdui.com

diduc.tv

uiddc.com

cuidd.com

idcdu.cn

DNS History

4 records (4 active, 0 former)

●A104.21.30.992026-05-01 → 2026-05-13 · 2 obs

● 2026-05-01 00:43:28
● 2026-05-13 10:26:06

●A172.67.172.1862026-05-01 → 2026-05-13 · 2 obs

● 2026-05-01 00:43:28
● 2026-05-13 10:26:06

●A2606:4700:3030::ac43:acba2026-05-01 → 2026-05-13 · 2 obs

● 2026-05-01 00:43:28
● 2026-05-13 10:26:06

●A2606:4700:3031::6815:1e632026-05-01 → 2026-05-13 · 2 obs

● 2026-05-01 00:43:28
● 2026-05-13 10:26:06

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
vn	a.dns-servers.vn, b.dns-servers.vn, c.dns-servers.vn, d.dns-servers.vn...	-
openlearning.edu.vn	toby.ns.cloudflare.com, angela.ns.cloudflare.com	-

✅ Authoritative Response

Server:172.64.33.239

NS records: toby.ns.cloudflare.com, angela.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

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

⏱️ Timing

Total: 697ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.172.186, 104.21.30.99`
AAAA	2	`2606:4700:3030::ac43:acba, 2606:4700:3031::6815:1e63`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`

Analysis

IP Addresses

ducid.openlearning.edu.vn points to four IP numbers: 2606:4700:3030::ac43:acba, 2606:4700:3031::6815:1e63, 104.21.30.99 and 172.67.172.186.

For instance, other host names dung2.openlearning.edu.vn, meu22.bio, trxnsdemo.openlearning.edu.vn, standartnews.eu and tieuhoc.openlearning.edu.vn share IP numbers with ducid.openlearning.edu.vn.

ducid.openlearning.edu.vn - robtex.com