`vietnamknowledge.com`

DNSSEC	⚠️ Not signed
A	104.26.1.226^{Cloudflare104.26.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
NS	`ns1.matbao.com` ⭐ ⚠️ Not in zone NS records
		A	13.250.228.99^{🇸🇬 Amazon13.250.0.0/15 EC2 SIN prefix}
			PTR	`ec2-13-250-228-99.ap-southeast-1.compute.amazonaws.com`
		A	103.110.128.60^{🇻🇳 AXYS-VN103.110.128.0/23}
NS	`ns1.infinityfree.com` ⚠️ Not in parent delegation
		A	198.251.90.216^{FRANTECH198.251.90.0/24 More specific route.}
			PTR	`ns1.byet.org`
NS	`ns2.infinityfree.com` ⚠️ Not in parent delegation
		A	198.251.86.153^{🇺🇸 FRANTECH198.251.86.0/24 More specific route.}
			PTR	`ns3.byet.org`
NS	`ns2.matbao.com` ⚠️ Not in zone NS records
		A	35.198.203.127^{🇸🇬 Google35.198.192.0/20}
			PTR	`127.203.198.35.bc.googleusercontent.com`
		A	103.138.89.11^{🇻🇳 VNPT-AS-VN103.138.88.0/23 VNPT-NET}
MX	`mail.vietnamknowledge.com` ⭐
TXT	`v=spf1 mx include:104.26.1.226 -all`
SOA	`ns1.matbao.com`admin@matbao.com 2023-12-08 #1

`com`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.gtld-servers.net` ⭐
	NS	`b.gtld-servers.net`
	NS	`c.gtld-servers.net`
	NS	`d.gtld-servers.net`
	NS	`e.gtld-servers.net`
	NS	`f.gtld-servers.net`
	NS	`g.gtld-servers.net`
	NS	`h.gtld-servers.net`
	NS	`i.gtld-servers.net`
	NS	`j.gtld-servers.net`
	NS	`k.gtld-servers.net`
	NS	`l.gtld-servers.net`
	NS	`m.gtld-servers.net`
	SOA	`a.gtld-servers.net`nstld@verisign-grs.com serial=1778397246

Subdomains

mail.vietnamknowledge.com

Same first word

vietnamknowledge.com

DNS History

15 records (6 active, 9 former)

○NSns05.domaincontrol.com2016-09-14 → 2016-09-14 · 4 obs

○ 2016-04-04 11:31:46
● 2016-09-14 02:19:56
○ 2017-10-03 00:34:42
○ 2026-05-10 07:22:30

○NSns06.domaincontrol.com2016-09-14 → 2016-09-14 · 4 obs

○ 2016-04-04 11:31:46
● 2016-09-14 02:19:56
○ 2017-10-03 00:34:42
○ 2026-05-10 07:22:30

●NSns1.infinityfree.com2026-03-09 → 2026-05-10 · 3 obs

○ 2017-10-03 00:34:42
● 2026-03-09 18:48:48
● 2026-05-10 07:22:30

●NSns1.matbao.com2026-03-09 → 2026-05-10 · 3 obs

○ 2017-10-03 00:34:42
● 2026-03-09 18:48:48
● 2026-05-10 07:22:30

●NSns2.infinityfree.com2026-03-09 → 2026-05-10 · 3 obs

○ 2017-10-03 00:34:42
● 2026-03-09 18:48:48
● 2026-05-10 07:22:30

●NSns2.matbao.com2026-03-09 → 2026-05-10 · 3 obs

○ 2017-10-03 00:34:42
● 2026-03-09 18:48:48
● 2026-05-10 07:22:30

○NSns27.ixwebhosting.com2015-10-17 → 2016-04-04 · 4 obs

● 2015-10-17 12:12:32
● 2016-04-04 11:31:46
○ 2016-09-14 02:19:56
○ 2026-05-10 07:22:30

○NSns28.ixwebhosting.com2015-10-17 → 2016-04-04 · 4 obs

● 2015-10-17 12:12:32
● 2016-04-04 11:31:46
○ 2016-09-14 02:19:56
○ 2026-05-10 07:22:30

●MXmail.vietnamknowledge.com2026-03-09 → 2026-05-10 · 3 obs

○ 2017-10-03 00:34:42
● 2026-03-09 18:48:48
● 2026-05-10 07:22:30

○MXmail1408.ixwebhosting.com2015-10-17 → 2016-04-04 · 4 obs

● 2015-10-17 12:12:32
● 2016-04-04 11:31:46
○ 2016-09-14 02:19:56
○ 2026-05-10 07:22:30

○MXmailstore1.secureserver.net2016-09-14 → 2016-09-14 · 4 obs

○ 2016-04-04 11:31:46
● 2016-09-14 02:19:56
○ 2017-10-03 00:34:42
○ 2026-05-10 07:22:30

○MXsmtp.secureserver.net2016-09-14 → 2016-09-14 · 4 obs

○ 2016-04-04 11:31:46
● 2016-09-14 02:19:56
○ 2017-10-03 00:34:42
○ 2026-05-10 07:22:30

●A104.26.1.2262026-03-09 → 2026-05-10 · 3 obs

○ 2017-10-03 00:34:42
● 2026-03-09 18:48:48
● 2026-05-10 07:22:30

○A184.168.221.632016-09-14 → 2016-09-14 · 4 obs

○ 2016-04-04 11:31:46
● 2016-09-14 02:19:56
○ 2017-10-03 00:34:42
○ 2026-05-10 07:22:30

○A50.118.76.22015-10-17 → 2016-04-04 · 4 obs

● 2015-10-17 12:12:32
● 2016-04-04 11:31:46
○ 2016-09-14 02:19:56
○ 2026-05-10 07:22:30

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
vietnamknowledge.com	ns1.matbao.com, ns2.matbao.com	4 records

✅ Authoritative Response

Server:103.110.128.60

NS records: ns1.matbao.com, ns2.matbao.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for vietnamknowledge.com (unsigned zone)

⏱️ Timing

Total: 608ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`104.26.1.226`
NS	2	`ns1.infinityfree.com, ns2.infinityfree.com`
MX	1	`mail.vietnamknowledge.com (pri: 10)`
TXT	1	`v=spf1 mx include:104.26.1.226 -all`
SOA	1	`ns1.matbao.com admin.matbao.com`

📌 Glue Records Collected

Total: 4

Out-of-bailiwick: 4 (ns1.matbao.com, ns1.matbao.com, ns2.matbao.com...)

Analysis

Hierarchy

vietnamknowledge.com is the parent of mail.vietnamknowledge.com.

IP Addresses

vietnamknowledge.com resolves to one IP number: 104.26.1.226.

other host names including www.intramuros.gov.ph, forum.infinityfree.com, christmastreeworld.co.uk, isarcolor.de and proprivacy.com share IP numbers with vietnamknowledge.com.

Name Servers

vietnamknowledge.com is delegated to four name servers: ns1.infinityfree.com, ns2.infinityfree.com, ns1.matbao.com and ns2.matbao.com.

vietnamknowledge.com at least partially shares name servers with other domains, for instance jantungaman.asia, vinahic.com, nhuadongtam.com, spencil.vn and thelinkcitykimoanh.xyz.

these name servers are commonly used with the name servers ns1.byet.org, ns2.byet.org, ns3.byet.org, ns4.byet.org, ns5.byet.org, ns1.matbao.vn, ns2.matbao.vn and ns-bak.matbao.com.

Host names with two IP numbers:

ns1.matbao.com points to 13.250.228.99 and 103.110.128.60; ns2.matbao.com points to 35.198.203.127 and 103.138.89.11.

Host names with one IP number:

ns1.infinityfree.com points to 198.251.90.216; ns2.infinityfree.com points to 198.251.86.153.

Mail Servers

vietnamknowledge.com is handled by a single mail server, mail.vietnamknowledge.com.

vietnamknowledge.com - robtex.com