`quangduc.vn`

DNSSEC	⚠️ Not signed
A	2606:4700:3032::ac43:cf30^{🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3036::6815:4d6e^{🇺🇸 Cloudflare2606:4700:3036::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.77.110^{Cloudflare104.21.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.207.48^{🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`alex.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3b64^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`alex.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c164^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`alex.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2164^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`alex.ns.cloudflare.com`
		A	108.162.193.100^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`alex.ns.cloudflare.com`
		A	172.64.33.100^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`alex.ns.cloudflare.com`
		A	173.245.59.100^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`alex.ns.cloudflare.com`
NS	`eloise.ns.cloudflare.com`
		A	2606:4700:50::a29f:26d0^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`eloise.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c2d0^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`eloise.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:22d0^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`eloise.ns.cloudflare.com`
		A	108.162.194.208^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
		A	162.159.38.208^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
		A	172.64.34.208^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
MX	`quangduc-vn.mail.protection.outlook.com` ⭐
		A	2a01:111:f403:cc09::^{🇸🇬 Microsoft2a01:111:f000::/36}
			PTR	`mail-sg2pr03cu00500.inbound.protection.outlook.com`
		A	2a01:111:f403:cc1a::8^{🇯🇵 Microsoft2a01:111:f000::/36}
			PTR	`mail-tydpr03cu00100.inbound.protection.outlook.com`
		A	2a01:111:f403:cc1f::4^{🇯🇵 Microsoft2a01:111:f000::/36}
			PTR	`mail-os8pr02cu00104.inbound.protection.outlook.com`
		A	52.101.124.117^{🇯🇵 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-tydpr03cu00105.inbound.protection.outlook.com`
		A	52.101.137.0^{🇸🇬 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-sg2pr03cu00500.inbound.protection.outlook.com`
		A	52.101.157.80^{🇺🇸 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-os8pr02cu00100.inbound.protection.outlook.com`
TXT	`MS=ms58084499`
TXT	`facebook-domain-verification=68bho959j16niigrdbbi7yioml1nyk`
TXT	`google-site-verification=ExKMwTu29cV2byVxBlDZLRNPGUKAnEcP6sBrwYnfoO0`
TXT	`google-site-verification=PHsIdiwts8X8_rftTxitD_whG7UCTrP-mLfHvMMtqGc`
TXT	`v=spf1 include:spf.protection.outlook.com -all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.77.110, 172.67.207.48
		IPv6 hints	2606:4700:3032::ac43:cf30, 2606:4700:3036::6815:4d6e
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=199, name=cloudflare-ech.com
SOA	`alex.ns.cloudflare.com`dns@cloudflare.com serial=2409804482

`vn`

	DNSSEC	🔒 Signed (DS record present)
	NS	`dns-master.vnnic.vn` ⭐
	NS	`a.dns-servers.vn`
	NS	`b.dns-servers.vn`
	NS	`c.dns-servers.vn`
	NS	`d.dns-servers.vn`
	NS	`e.dns-servers.vn`
	NS	`f.dns-servers.vn`
	NS	`g.dns-servers.vn`
	NS	`h.dns-servers.vn`
	SOA	`dns-master.vnnic.vn`postmaster@vnnic.vn serial=2031047589

Previously MX for

quangduc.vn

Subdomains

www.quangduc.vn

Same first word

quangduc.vn

quangduc.net

quangduc.org

quangduc.com

Similar names

ducquang.com.vn

DNS History

25 records (7 active, 18 former)

●NSalex.ns.cloudflare.com2026-03-27 → 2026-07-28 · 3 obs

○ 2026-03-19 07:57:18
● 2026-03-27 08:40:32
● 2026-07-28 15:13:20

●NSeloise.ns.cloudflare.com2026-03-27 → 2026-07-28 · 3 obs

○ 2026-03-19 07:57:18
● 2026-03-27 08:40:32
● 2026-07-28 15:13:20

○NSns1.dotvndns.vn2018-05-13 → 2026-03-19 · 4 obs

● 2018-05-13 06:38:42
● 2026-03-19 07:57:18
○ 2026-03-27 08:40:32
○ 2026-07-28 15:13:20

○NSns2.dotvndns.vn2018-05-13 → 2026-03-19 · 4 obs

● 2018-05-13 06:38:42
● 2026-03-19 07:57:18
○ 2026-03-27 08:40:32
○ 2026-07-28 15:13:20

○NSnsbak.dotvndns.com2018-05-13 → 2026-03-19 · 4 obs

● 2018-05-13 06:38:42
● 2026-03-19 07:57:18
○ 2026-03-27 08:40:32
○ 2026-07-28 15:13:20

○MX_dc-mx.f89225944199.quangduc.vn2026-04-21 → 2026-06-08 · 5 obs

○ 2026-03-28 05:58:38
● 2026-04-21 11:02:54
● 2026-06-08 16:31:02
○ 2026-06-22 23:15:28
○ 2026-07-28 15:13:20

○MXalt1.aspmx.l.google.com2018-05-13 → 2026-06-08 · 4 obs

● 2018-05-13 06:38:42
● 2026-06-08 16:31:02
○ 2026-06-22 23:15:28
○ 2026-07-28 15:13:20

○MXalt2.aspmx.l.google.com2018-05-13 → 2026-06-08 · 4 obs

● 2018-05-13 06:38:42
● 2026-06-08 16:31:02
○ 2026-06-22 23:15:28
○ 2026-07-28 15:13:20

○MXalt3.aspmx.l.google.com2018-05-13 → 2026-06-08 · 4 obs

● 2018-05-13 06:38:42
● 2026-06-08 16:31:02
○ 2026-06-22 23:15:28
○ 2026-07-28 15:13:20

○MXalt4.aspmx.l.google.com2018-05-13 → 2026-06-08 · 4 obs

● 2018-05-13 06:38:42
● 2026-06-08 16:31:02
○ 2026-06-22 23:15:28
○ 2026-07-28 15:13:20

○MXaspmx.l.google.com2018-05-13 → 2026-06-08 · 4 obs

● 2018-05-13 06:38:42
● 2026-06-08 16:31:02
○ 2026-06-22 23:15:28
○ 2026-07-28 15:13:20

●MXquangduc-vn.mail.protection.outlook.com2026-06-22 → 2026-07-28 · 3 obs

○ 2026-06-08 16:31:02
● 2026-06-22 23:15:28
● 2026-07-28 15:13:20

○MXquangduc.vn2018-05-13 → 2026-03-28 · 4 obs

● 2018-05-13 06:38:42
● 2026-03-28 05:58:38
○ 2026-04-21 11:02:54
○ 2026-07-28 15:13:20

○A103.154.177.402026-03-19 → 2026-03-28 · 5 obs

○ 2018-05-13 06:38:42
● 2026-03-19 07:57:18
● 2026-03-28 05:58:38
○ 2026-04-21 11:02:54
○ 2026-07-28 15:13:20

●A104.21.77.1102026-04-21 → 2026-07-28 · 5 obs

○ 2026-03-28 05:58:38
● 2026-04-21 11:02:54
○ 2026-07-20 21:40:50
● 2026-07-28 03:35:36
● 2026-07-28 15:13:20

●A172.67.207.482026-04-21 → 2026-07-28 · 5 obs

○ 2026-03-28 05:58:38
● 2026-04-21 11:02:54
○ 2026-07-20 21:40:50
● 2026-07-28 03:35:36
● 2026-07-28 15:13:20

○A188.114.96.02026-07-20 → 2026-07-20 · 4 obs

○ 2026-06-22 23:15:28
● 2026-07-20 21:40:50
○ 2026-07-28 03:35:36
○ 2026-07-28 15:13:20

○A188.114.97.02026-07-20 → 2026-07-20 · 4 obs

○ 2026-06-22 23:15:28
● 2026-07-20 21:40:50
○ 2026-07-28 03:35:36
○ 2026-07-28 15:13:20

○A2606:4700:3031::6815:4d6e2026-04-21 → 2026-06-08 · 5 obs

○ 2026-03-28 05:58:38
● 2026-04-21 11:02:54
● 2026-06-08 16:31:02
○ 2026-06-22 23:15:28
○ 2026-07-28 15:13:20

●A2606:4700:3032::ac43:cf302026-06-22 → 2026-07-28 · 5 obs

○ 2026-06-08 16:31:02
● 2026-06-22 23:15:28
○ 2026-07-20 21:40:50
● 2026-07-28 03:35:36
● 2026-07-28 15:13:20

●A2606:4700:3036::6815:4d6e2026-06-22 → 2026-07-28 · 5 obs

○ 2026-06-08 16:31:02
● 2026-06-22 23:15:28
○ 2026-07-20 21:40:50
● 2026-07-28 03:35:36
● 2026-07-28 15:13:20

○A2606:4700:3036::ac43:cf302026-04-21 → 2026-06-08 · 5 obs

○ 2026-03-28 05:58:38
● 2026-04-21 11:02:54
● 2026-06-08 16:31:02
○ 2026-06-22 23:15:28
○ 2026-07-28 15:13:20

○A2a06:98c1:3120::2026-07-20 → 2026-07-20 · 4 obs

○ 2026-06-22 23:15:28
● 2026-07-20 21:40:50
○ 2026-07-28 03:35:36
○ 2026-07-28 15:13:20

○A2a06:98c1:3121::2026-07-20 → 2026-07-20 · 4 obs

○ 2026-06-22 23:15:28
● 2026-07-20 21:40:50
○ 2026-07-28 03:35:36
○ 2026-07-28 15:13:20

○A42.117.5.122018-05-13 → 2018-05-13 · 3 obs

● 2018-05-13 06:38:42
○ 2026-03-19 07:57:18
○ 2026-07-28 15:13:20

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
vn	a.dns-servers.vn, b.dns-servers.vn, c.dns-servers.vn, d.dns-servers.vn...	16 records
quangduc.vn	eloise.ns.cloudflare.com, alex.ns.cloudflare.com	-

✅ Authoritative Response

Server:172.64.33.100

NS records: eloise.ns.cloudflare.com, alex.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for quangduc.vn (unsigned zone)

⏱️ Timing

Total: 811ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.77.110, 172.67.207.48`
AAAA	2	`2606:4700:3036::6815:4d6e, 2606:4700:3032::ac43:cf30`
NS	2	`alex.ns.cloudflare.com, eloise.ns.cloudflare.com`
MX	1	`quangduc-vn.mail.protection.outlook.com`
TXT	5	`MS=ms58084499, facebook-domain-verification=68bho959j16...`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`alex.ns.cloudflare.com dns.cloudflare.co`

📌 Glue Records Collected

Total: 16

In-bailiwick: 16 (a.dns-servers.vn, a.dns-servers.vn, b.dns-servers.vn...)

Analysis

Hierarchy

www.quangduc.vn is a subdomain of quangduc.vn.

IP Addresses

quangduc.vn points to the four IP addresses 104.21.77.110, 172.67.207.48, 2606:4700:3032::ac43:cf30 and 2606:4700:3036::6815:4d6e.

Additional host names — sastrugipress.com, www.newiweb.info, bbppwgyzxftcx.online and two others — share IP numbers with quangduc.vn.

Name Servers

Two name servers handle the delegation for quangduc.vn: alex.ns.cloudflare.com and eloise.ns.cloudflare.com.

quangduc.vn uses the same name servers as theumbrella.com.pk, auroradsp.com, snowberry.pk and duodaa.pages.dev, among others.

The name servers of quangduc.vn overlap at least partially with those of other domains — among them hilang.app, conradspainting.com, littlefingersindia.com and two more.

These name servers commonly appear alongside the name servers ivan.ns.cloudflare.com and norman.ns.cloudflare.com.

Host names with 6 IP numbers:

alex.ns.cloudflare.com resolves to 108.162.193.100, 172.64.33.100 and 173.245.59.100 among others, with 3 other IP addresses in total.

eloise.ns.cloudflare.com resolves to 108.162.194.208, 162.159.38.208 and 172.64.34.208 among others, with 3 other IP addresses in total.

Mail Servers

quangduc.vn has one mail server: quangduc-vn.mail.protection.outlook.com.

quangduc-vn.mail.protection.outlook.com points to 6 IP numbers: 52.101.124.117, 52.101.137.0, 52.101.157.80 and 3 other.

quangduc.vn - robtex.com

quangduc.vn

vn

Previously MX for

Subdomains

Same first word

Similar names

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

📌 Glue Records Collected

Analysis

Hierarchy

IP Addresses

Name Servers

Mail Servers

`quangduc.vn`

`vn`