techknowledge.vn - dns.ninja

`techknowledge.vn`

DNSSEC	⚠️ Not signed
A	112.213.88.238^{🇻🇳 SUPERDATA112.213.88.0/24 Vietnam Internet Network Information Center (VNNIC) 18 Nguyen Du Str, Hai Ba Trung District, Hanoi City, Vietnam 24th floor, VNTA Tower, Duong Dinh Nghe, Cau Giay, Hanoi}
		PTR	`mx88238.superdata.vn`
NS	`ns1.dotvndns.vn` ⭐ ⚠️ Not in parent delegation
		A	2406:9c80::66^{🇻🇳 SUPERDATA2406:9c80::/48 -VN}
		A	112.213.89.3^{🇻🇳 SUPERDATA112.213.89.0/24 Vietnam Internet Network Information Center (VNNIC) 18 Nguyen Du Str, Hai Ba Trung District, Hanoi City, Vietnam 24th floor, VNTA Tower, Duong Dinh Nghe, Cau Giay, Hanoi}
			PTR	`ns1.dotvndns.vn`
NS	`ns1.pavietnam.vn` ⚠️ Not in zone NS records
		A	2406:9c80::66^{🇻🇳 SUPERDATA2406:9c80::/48 -VN}
		A	112.213.89.3^{🇻🇳 SUPERDATA112.213.89.0/24 Vietnam Internet Network Information Center (VNNIC) 18 Nguyen Du Str, Hai Ba Trung District, Hanoi City, Vietnam 24th floor, VNTA Tower, Duong Dinh Nghe, Cau Giay, Hanoi}
			PTR	`ns1.dotvndns.vn`
NS	`ns2.dotvndns.vn` ⚠️ Not in parent delegation
		A	2406:9c80::9000:111^{🇻🇳 SUPERDATA2406:9c80::/48 -VN}
			PTR	`ns2.dotvndns.vn`
		A	222.255.121.247^{🇻🇳 VDC222.255.121.0/24 VNPT}
			PTR	`static.vdc.vn`
			PTR	`static.vnpt.vn`
NS	`ns2.pavietnam.vn` ⚠️ Not in zone NS records
		A	2406:9c80::9000:111^{🇻🇳 SUPERDATA2406:9c80::/48 -VN}
			PTR	`ns2.dotvndns.vn`
		A	222.255.121.247^{🇻🇳 VDC222.255.121.0/24 VNPT}
			PTR	`static.vdc.vn`
			PTR	`static.vnpt.vn`
NS	`nsbak.pavietnam.net` ⚠️ Not in zone NS records
		A	2406:9c80::9000:302^{🇻🇳 SUPERDATA2406:9c80::/48 -VN}
			PTR	`nsbak.dotvndns.com`
		A	112.213.89.22^{🇻🇳 SUPERDATA112.213.89.0/24 Vietnam Internet Network Information Center (VNNIC) 18 Nguyen Du Str, Hai Ba Trung District, Hanoi City, Vietnam 24th floor, VNTA Tower, Duong Dinh Nghe, Cau Giay, Hanoi}
			PTR	`ns8922.dotvndns.vn`
NS	`nsbak.pavietnam.vn` ⚠️ Not in zone NS records
		A	2406:9c80::9000:302^{🇻🇳 SUPERDATA2406:9c80::/48 -VN}
			PTR	`nsbak.dotvndns.com`
		A	112.213.89.3^{🇻🇳 SUPERDATA112.213.89.0/24 Vietnam Internet Network Information Center (VNNIC) 18 Nguyen Du Str, Hai Ba Trung District, Hanoi City, Vietnam 24th floor, VNTA Tower, Duong Dinh Nghe, Cau Giay, Hanoi}
			PTR	`ns1.dotvndns.vn`
MX	`aspmx.l.google.com` ⭐
		A	2607:f8b0:4004:c07::1b^{🇺🇸 Google2607:f8b0:4004::/48}
			PTR	`bc-in-f27.1e100.net`
		A	192.178.155.27^{🇺🇸 Google192.178.155.0/24}
			PTR	`yuiadrs-in-f27.1e100.net`
MX	`alt1.aspmx.l.google.com`⁽⁵⁾
		A	2800:3f0:4003:c14::1b^{🇨🇱 Google2800:3f0:4003::/48}
		A	192.178.234.26^{🇺🇸 Google192.178.0.0/15}
			PTR	`ncsclj-in-f26.1e100.net`
MX	`alt2.aspmx.l.google.com`⁽⁵⁾
		A	2a00:1450:400b:c02::1b^{🇮🇪 Google2a00:1450:400b::/48}
			PTR	`dj-in-f27.1e100.net`
		A	172.253.116.27^{🇺🇸 Google172.253.116.0/24}
			PTR	`dj-in-f27.1e100.net`
MX	`aspmx2.googlemail.com`⁽¹⁰⁾
		A	2800:3f0:4003:c14::1b^{🇨🇱 Google2800:3f0:4003::/48}
		A	192.178.234.27^{🇺🇸 Google192.178.0.0/15}
			PTR	`ncsclj-in-f27.1e100.net`
MX	`aspmx3.googlemail.com`⁽¹⁰⁾
		A	2a00:1450:400b:c02::1a^{🇮🇪 Google2a00:1450:400b::/48}
			PTR	`dj-in-f26.1e100.net`
		A	172.253.116.26^{🇺🇸 Google172.253.116.0/24}
			PTR	`dj-in-f26.1e100.net`
MX	`mail.techknowledge.vn`⁽¹⁰⁾
SOA	`ns1.dotvndns.vn`hostmaster@techknowledge.vn 2017-11-21 #0

`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=2031096147

Subdomains

mail.techknowledge.vn

www.techknowledge.vn

Same first word

Similar names

knowledgetech.com

knowledgetech.org

DNS History

13 records (13 active, 0 former)

●NSns1.dotvndns.vn2015-07-01 → 2026-08-11 · 2 obs

● 2015-07-01 14:40:14
● 2026-08-11 06:46:30

●NSns1.pavietnam.vn2026-02-14 → 2026-08-11 · 3 obs

○ 2015-07-01 14:40:14
● 2026-02-14 23:09:40
● 2026-08-11 06:46:30

●NSns2.dotvndns.vn2015-07-01 → 2026-08-11 · 2 obs

● 2015-07-01 14:40:14
● 2026-08-11 06:46:30

●NSns2.pavietnam.vn2026-02-14 → 2026-08-11 · 3 obs

○ 2015-07-01 14:40:14
● 2026-02-14 23:09:40
● 2026-08-11 06:46:30

●NSnsbak.pavietnam.net2026-02-14 → 2026-08-11 · 3 obs

○ 2015-07-01 14:40:14
● 2026-02-14 23:09:40
● 2026-08-11 06:46:30

●NSnsbak.pavietnam.vn2026-02-14 → 2026-08-11 · 3 obs

○ 2015-07-01 14:40:14
● 2026-02-14 23:09:40
● 2026-08-11 06:46:30

●MXalt1.aspmx.l.google.com2015-07-01 → 2026-08-11 · 2 obs

● 2015-07-01 14:40:14
● 2026-08-11 06:46:30

●MXalt2.aspmx.l.google.com2015-07-01 → 2026-08-11 · 2 obs

● 2015-07-01 14:40:14
● 2026-08-11 06:46:30

●MXaspmx.l.google.com2015-07-01 → 2026-08-11 · 2 obs

● 2015-07-01 14:40:14
● 2026-08-11 06:46:30

●MXaspmx2.googlemail.com2015-07-01 → 2026-08-11 · 2 obs

● 2015-07-01 14:40:14
● 2026-08-11 06:46:30

●MXaspmx3.googlemail.com2015-07-01 → 2026-08-11 · 2 obs

● 2015-07-01 14:40:14
● 2026-08-11 06:46:30

●MXmail.techknowledge.vn2015-07-01 → 2026-08-11 · 2 obs

● 2015-07-01 14:40:14
● 2026-08-11 06:46:30

●A112.213.88.2382015-07-01 → 2026-08-11 · 5 obs

● 2015-07-01 14:40:14
● 2017-12-12 10:18:04
○ 2026-07-31 05:07:40
● 2026-08-02 14:44:52
● 2026-08-11 06:46:30

🔍 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
techknowledge.vn	ns1.pavietnam.vn, ns2.pavietnam.vn, nsbak.pavietnam.vn, nsbak.pavietnam.net	4 records

✅ Authoritative Response

Server:112.213.89.3

NS records: ns1.pavietnam.vn, ns2.pavietnam.vn, nsbak.pavietnam.vn, nsbak.pavietnam.net

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for techknowledge.vn (unsigned zone)

⏱️ Timing

Total: 2136ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`112.213.88.238`
NS	2	`ns1.dotvndns.vn, ns2.dotvndns.vn`
MX	6	`ASPMX.L.GOOGLE.COM (pri: 1), ALT1.ASPMX.L.GOOGLE.COM (pri: 5)...`
SOA	1	`ns1.dotvndns.vn hostmaster.techknowledge`

📌 Glue Records Collected

Total: 20

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

Out-of-bailiwick: 4 (ns2.pavietnam.vn, ns2.pavietnam.vn, ns1.pavietnam.vn...)

Analysis

Hierarchy

mail.techknowledge.vn and www.techknowledge.vn each fall under techknowledge.vn as their parent domain.

IP Addresses

techknowledge.vn resolves to just one IP address, 112.213.88.238.

Further host names like mx88238.superdata.vn and www.techknowledge.vn overlap in IP numbers with techknowledge.vn.

Name Servers

techknowledge.vn is served by 6 authoritative name servers — among them nsbak.pavietnam.net, ns1.dotvndns.vn, ns2.dotvndns.vn and 3 others.

There is at least partial name server overlap between techknowledge.vn and other domains — detkimminhanh.com, lemino.mobi, csphoto.vn and two more among them.

These name servers regularly appear alongside ns1.pavietnam.vn, ns2.pavietnam.vn, nsbak.dotvndns.com and 3 other name servers in NS record sets.

Host names that have two IP addresses:

nsbak.pavietnam.net resolves to two addresses: 112.213.89.22 and 2406:9c80::9000:302.

ns1.dotvndns.vn resolves to two addresses: 112.213.89.3 and 2406:9c80::66.

ns2.dotvndns.vn resolves to two addresses: 222.255.121.247 and 2406:9c80::9000:111.

ns1.pavietnam.vn resolves to two addresses: 112.213.89.3 and 2406:9c80::66.

ns2.pavietnam.vn resolves to two addresses: 222.255.121.247 and 2406:9c80::9000:111.

nsbak.pavietnam.vn resolves to two addresses: 112.213.89.3 and 2406:9c80::9000:302.

nsbak.pavietnam.net along with nsbak.pavietnam.vn each resolve to 2406:9c80::9000:302 IP addresses.

ns1.dotvndns.vn along with ns1.pavietnam.vn each resolve to 2406:9c80::66 IP addresses.

Each of ns1.dotvndns.vn, ns1.pavietnam.vn and nsbak.pavietnam.vn resolves to 112.213.89.3.

ns2.dotvndns.vn along with ns2.pavietnam.vn each resolve to 2406:9c80::9000:111 IP addresses.

ns2.dotvndns.vn along with ns2.pavietnam.vn each resolve to 222.255.121.247 IP addresses.

Mail Servers

techknowledge.vn accepts email via 6 mail servers: aspmx2.googlemail.com, aspmx3.googlemail.com, mail.techknowledge.vn and 3 other.

There is at least a partial MX overlap between techknowledge.vn and other domains, including media-more.de, scotsmanconferences.com, cspgv.com.ar and two others.

These mail servers tend to appear in combination with mail servers alt2.aspmx.l.google.com, aspmx.l.google.com, alt1.aspmx.l.google.com and 4 others.

Host names that have two IP addresses:

aspmx2.googlemail.com resolves to two addresses: 192.178.234.27 and 2800:3f0:4003:c14::1b.

aspmx3.googlemail.com resolves to two addresses: 172.253.116.26 and 2a00:1450:400b:c02::1a.

aspmx.l.google.com resolves to two addresses: 192.178.155.27 and 2607:f8b0:4004:c07::1b.

alt1.aspmx.l.google.com resolves to two addresses: 192.178.234.26 and 2800:3f0:4003:c14::1b.

alt2.aspmx.l.google.com resolves to two addresses: 172.253.116.27 and 2a00:1450:400b:c02::1b.

aspmx2.googlemail.com along with alt1.aspmx.l.google.com each resolve to 2800:3f0:4003:c14::1b IP addresses.