`cirtech.edu.vn`

DNSSEC	⚠️ Not signed
NS	`ns1.viettelidc.com.vn` ⭐ ⚠️ Not in parent delegation
		A	2401:5f80:2000:2::4^{🇻🇳 VTDC-AS-VN2401:5f80:2000::/36 VTDC-VN}
		A	115.84.177.33^{🇻🇳 VTDC-AS-VN115.84.176.0/22 Proxy-registered route object}
			PTR	`ns1.vtdc.net`
			PTR	`ns1.viettelidc.com.vn`
NS	`ns.viettelidc.com.vn`
		A	2401:5f80:2000:1::5^{🇻🇳 VTDC-AS-VN2401:5f80:2000::/36 VTDC-VN}
		A	115.84.177.8^{🇻🇳 VTDC-AS-VN115.84.176.0/22 Proxy-registered route object}
			PTR	`ns.vtdc.net`
			PTR	`ns.viettelidc.com.vn`
NS	`ns2.viettelidc.com.vn`
		A	2401:5f80:4000:1::4^{🇻🇳 VTDC-AS-VN2401:5f80:4000::/36 VTDC-VN}
		A	115.84.181.10^{🇻🇳 VTDC-AS-VN115.84.180.0/22 Proxy-registered route object}
			PTR	`ns2.vtdc.net`
			PTR	`ns2.viettelidc.com.vn`
MX	`aspmx.l.google.com` ⭐
		A	2607:f8b0:4023:c06::1b^{🇺🇸 Google2607:f8b0::/32}
			PTR	`dz-in-f27.1e100.net`
		A	142.250.101.27^{🇺🇸 Google142.250.101.0/24}
			PTR	`dz-in-f27.1e100.net`
MX	`alt1.aspmx.l.google.com`⁽⁵⁾
		A	2800:3f0:4003:c0f::1a^{🇨🇱 Google2800:3f0:4003::/48}
		A	108.177.123.26^{🇺🇸 Google108.177.123.0/24}
			PTR	`lcscld-in-f26.1e100.net`
MX	`alt2.aspmx.l.google.com`⁽⁵⁾
		A	2607:f8b0:4023:3003::1a^{🇺🇸 Google2607:f8b0::/32}
			PTR	`yulnkjt-in-f26.1e100.net`
		A	172.253.145.27^{🇺🇸 Google172.253.145.0/24}
			PTR	`yulnkjt-in-f27.1e100.net`
MX	`alt3.aspmx.l.google.com`⁽¹⁰⁾
		A	2607:f8b0:4023:1015::1b^{🇺🇸 Google2607:f8b0::/32}
			PTR	`yudfwta-in-f27.1e100.net`
		A	172.253.135.27^{🇺🇸 Google172.253.135.0/24}
			PTR	`yudfwta-in-f27.1e100.net`
MX	`alt4.aspmx.l.google.com`⁽¹⁰⁾
		A	2a00:1450:400c:c00::1b^{🇧🇪 Google2a00:1450:400c::/48}
			PTR	`ws-in-f27.1e100.net`
			PTR	`ws-in-x1b.1e100.net`
		A	173.194.76.26^{🇺🇸 Google173.194.76.0/24}
			PTR	`ws-in-f26.1e100.net`
MX	`mx1.improvmx.com`⁽¹⁰⁾
		A	2a05:d012:412:e201:88aa:e7b9:7a43:12d7^{🇫🇷 Amazon2a05:d012:400::/38 AMAZON AWS}
		A	2a05:d012:412:e202:f36:2c1f:1a49:d38a^{🇫🇷 Amazon2a05:d012:400::/38 AMAZON AWS}
		A	2a05:d012:412:e203:373a:f51a:4a85:1d25^{🇫🇷 Amazon2a05:d012:400::/38 AMAZON AWS}
		A	13.37.195.136^{🇫🇷 Amazon13.36.0.0/14 EC2 CDG Prefix}
			PTR	`ec2-13-37-195-136.eu-west-3.compute.amazonaws.com`
		A	15.236.236.160^{🇫🇷 Amazon15.236.0.0/15 EC2 CDG prefix}
			PTR	`ec2-15-236-236-160.eu-west-3.compute.amazonaws.com`
		A	35.181.18.45^{🇫🇷 Amazon35.181.0.0/16 EC2 CDG prefix}
			PTR	`ec2-35-181-18-45.eu-west-3.compute.amazonaws.com`
MX	`mx2.improvmx.com`⁽²⁰⁾
		A	2a05:d012:412:e201:1f6e:f6e4:8fd7:4678^{🇫🇷 Amazon2a05:d012:400::/38 AMAZON AWS}
		A	2a05:d012:412:e202:e81e:cc44:3b53:8a3d^{🇫🇷 Amazon2a05:d012:400::/38 AMAZON AWS}
		A	2a05:d012:412:e203:7e33:3d9c:28d7:ee20^{🇫🇷 Amazon2a05:d012:400::/38 AMAZON AWS}
		A	13.36.107.63^{🇫🇷 Amazon13.36.0.0/14 EC2 CDG Prefix}
			PTR	`ec2-13-36-107-63.eu-west-3.compute.amazonaws.com`
		A	13.36.222.39^{🇫🇷 Amazon13.36.0.0/14 EC2 CDG Prefix}
			PTR	`ec2-13-36-222-39.eu-west-3.compute.amazonaws.com`
		A	15.236.61.92^{🇫🇷 Amazon15.236.0.0/15 EC2 CDG prefix}
			PTR	`ec2-15-236-61-92.eu-west-3.compute.amazonaws.com`
TXT	`v=spf1 include:spf.improvmx.com ~all`
TXT	`google-site-verification=JozLwjTMk2GaUj1PMv7M9ee82iVYzkwJaDrTXN_M1I0`
SOA	`ns.viettelidc.com.vn`hostmaster@cirtech.edu.vn serial=1778338508

`edu.vn`

	DNSSEC	⚠️ Not signed
	NS	`dns-master.vnnic.vn` ⭐
	NS	`a.dns-servers.vn` ⚠️ Not in parent delegation
	NS	`b.dns-servers.vn` ⚠️ Not in parent delegation
	NS	`c.dns-servers.vn` ⚠️ Not in parent delegation
	NS	`d.dns-servers.vn` ⚠️ Not in parent delegation
	NS	`e.dns-servers.vn` ⚠️ Not in parent delegation
	NS	`f.dns-servers.vn` ⚠️ Not in parent delegation
	NS	`g.dns-servers.vn` ⚠️ Not in parent delegation
	NS	`h.dns-servers.vn` ⚠️ Not in parent delegation
	SOA	`dns-master.vnnic.vn`postmaster@vnnic.vn serial=2018564640

Subdomains

dlc.cirtech.edu.vn

Same first word

cirtech.co.nz

cirtech.edu.vn

cirtech.co.uk

cirtech.org

cirtech.us

cirtech.com

cirtech.biz

Similar names

techirc.com

critech.dk

chitrec.org

critech.biz

hirtecc.de

crichet.com

rictech.ru

thercci.com

richtec.de

irctech.com

theiccr.com

ticcher.com

rcitech.com

rictech.com

thericc.com

richtec.com

itechcr.net

theicrc.org

thecric.com

hitecrc.de

cihcert.com

itechcr.com

richtec.in

richtec.com.tw

techric.com

critech.com

rcitech.ca

chicret.com

chertic.ru

thecirc.com

thcrice.com

ccthire.com

thercci.org

techicr.com

thericc.org

irctech.net

critech.ru

chicret.gr

DNS History

10 records (10 active, 0 former)

●NSns.viettelidc.com.vn2026-05-08 → 2026-05-09 · 2 obs

● 2026-05-08 13:17:44
● 2026-05-09 14:59:32

●NSns1.viettelidc.com.vn2026-05-08 → 2026-05-09 · 2 obs

● 2026-05-08 13:17:44
● 2026-05-09 14:59:32

●NSns2.viettelidc.com.vn2026-05-08 → 2026-05-09 · 2 obs

● 2026-05-08 13:17:44
● 2026-05-09 14:59:32

●MXalt1.aspmx.l.google.com2026-05-08 → 2026-05-09 · 2 obs

● 2026-05-08 13:17:44
● 2026-05-09 14:59:32

●MXalt2.aspmx.l.google.com2026-05-08 → 2026-05-09 · 2 obs

● 2026-05-08 13:17:44
● 2026-05-09 14:59:32

●MXalt3.aspmx.l.google.com2026-05-08 → 2026-05-09 · 2 obs

● 2026-05-08 13:17:44
● 2026-05-09 14:59:32

●MXalt4.aspmx.l.google.com2026-05-08 → 2026-05-09 · 2 obs

● 2026-05-08 13:17:44
● 2026-05-09 14:59:32

●MXaspmx.l.google.com2026-05-08 → 2026-05-09 · 2 obs

● 2026-05-08 13:17:44
● 2026-05-09 14:59:32

●MXmx1.improvmx.com2026-05-08 → 2026-05-09 · 2 obs

● 2026-05-08 13:17:44
● 2026-05-09 14:59:32

●MXmx2.improvmx.com2026-05-08 → 2026-05-09 · 2 obs

● 2026-05-08 13:17:44
● 2026-05-09 14:59:32

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
vn	a.dns-servers.vn, b.dns-servers.vn, c.dns-servers.vn, d.dns-servers.vn...	-
cirtech.edu.vn	ns1.viettelidc.com.vn, ns2.viettelidc.com.vn	-

✅ Authoritative Response

Server:115.84.177.33

NS records: ns1.viettelidc.com.vn, ns2.viettelidc.com.vn

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

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

⏱️ Timing

Total: 1997ms | Queries: -

📄 Records

Type	Count	Sample Data
NS	3	`ns.viettelidc.com.vn, ns1.viettelidc.com.vn...`
MX	7	`ALT1.ASPMX.L.GOOGLE.COM (pri: 5), ASPMX.L.GOOGLE.COM (pri: 1)...`
TXT	2	`v=spf1 include:spf.improvmx.com ~all, google-site-verification=JozLwjTMk2GaUj1`
SOA	1	`ns.viettelidc.com.vn hostmaster.cirtech.`

Analysis

Hierarchy

cirtech.edu.vn is the parent of dlc.cirtech.edu.vn.

Name Servers

cirtech.edu.vn is delegated to three name servers: ns1.viettelidc.com.vn, ns2.viettelidc.com.vn and ns.viettelidc.com.vn.

cirtech.edu.vn at least partially shares name servers with other domains, for instance mnyenbaia.edu.vn, banhcuontrung.vn, bvlaophoitravinh.org.vn, rakita.vn and dmsviettel.vn.

Host names with two IP numbers:

Host ns1.viettelidc.com.vn points to 2401:5f80:2000:2::4 and 115.84.177.33.

Host ns2.viettelidc.com.vn points to 2401:5f80:4000:1::4 and 115.84.181.10.

Host ns.viettelidc.com.vn points to 2401:5f80:2000:1::5 and 115.84.177.8.

Mail Servers

cirtech.edu.vn is handled by seven mail servers: mx1.improvmx.com, mx2.improvmx.com, aspmx.l.google.com, alt1.aspmx.l.google.com, alt2.aspmx.l.google.com, alt3.aspmx.l.google.com and alt4.aspmx.l.google.com.

cirtech.edu.vn shares mail servers with other domains at least partially, including plingua.com, monicagupta.com, msbi.jp, accaclubindia.in and govelo.com.