`citisys.vn`

DNSSEC	⚠️ Not signed
A	2606:4700:3033::6815:2ce3^{🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3033::ac43:ccbe^{🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.44.227^{Cloudflare104.21.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.204.190^{🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`janet.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3aa9^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`janet.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c0a9^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`janet.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:20a9^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`janet.ns.cloudflare.com`
		A	108.162.192.169^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`janet.ns.cloudflare.com`
		A	172.64.32.169^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`janet.ns.cloudflare.com`
		A	173.245.58.169^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`janet.ns.cloudflare.com`
NS	`leonard.ns.cloudflare.com`
		A	2606:4700:58::a29f:2c36^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`leonard.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c336^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`leonard.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2336^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`leonard.ns.cloudflare.com`
		A	108.162.195.54^{🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`leonard.ns.cloudflare.com`
		A	162.159.44.54^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`leonard.ns.cloudflare.com`
		A	172.64.35.54^{🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`leonard.ns.cloudflare.com`
MX	`aspmx.l.google.com` ⭐
		A	2607:f8b0:4004:c19::1b^{🇺🇸 Google2607:f8b0:4004::/48}
			PTR	`bk-in-f27.1e100.net`
		A	173.194.45.26^{🇺🇸 Google173.194.0.0/16}
MX	`alt1.aspmx.l.google.com`⁽⁵⁾
		A	2800:3f0:4003:c0f::1b^{🇨🇱 Google2800:3f0:4003::/48}
		A	108.177.123.27^{🇺🇸 Google108.177.123.0/24}
			PTR	`lcscld-in-f27.1e100.net`
MX	`alt2.aspmx.l.google.com`⁽⁵⁾
		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	`alt3.aspmx.l.google.com`⁽¹⁰⁾
		A	2a00:1450:4009:c0f::1a^{🇬🇧 Google2a00:1450:4009::/48}
			PTR	`yulhrs-in-f26.1e100.net`
		A	192.178.223.26^{🇺🇸 Google192.178.223.0/24}
			PTR	`yulhrs-in-f26.1e100.net`
MX	`alt4.aspmx.l.google.com`⁽¹⁰⁾
		A	2a00:1450:400c:c23::1a^{🇧🇪 Google2a00:1450:400c::/48}
			PTR	`yubrupd-in-f26.1e100.net`
		A	172.253.157.26^{🇺🇸 Google172.253.0.0/16}
			PTR	`yubrupd-in-f26.1e100.net`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.44.227, 172.67.204.190
		IPv6 hints	2606:4700:3033::6815:2ce3, 2606:4700:3033::ac43:ccbe
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=43, name=cloudflare-ech.com
SOA	`janet.ns.cloudflare.com`dns@cloudflare.com serial=2408904336

`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 2031-01-27 #16

Subdomains

gateway.citisys.vn

Same first word

citisys.vn

DNS History

11 records (11 active, 0 former)

●NSjanet.ns.cloudflare.com2026-07-11 → 2026-07-18 · 2 obs

● 2026-07-11 02:06:06
● 2026-07-18 19:53:52

●NSleonard.ns.cloudflare.com2026-07-11 → 2026-07-18 · 2 obs

● 2026-07-11 02:06:06
● 2026-07-18 19:53:52

●MXalt1.aspmx.l.google.com2026-07-11 → 2026-07-18 · 2 obs

● 2026-07-11 02:06:06
● 2026-07-18 19:53:52

●MXalt2.aspmx.l.google.com2026-07-11 → 2026-07-18 · 2 obs

● 2026-07-11 02:06:06
● 2026-07-18 19:53:52

●MXalt3.aspmx.l.google.com2026-07-11 → 2026-07-18 · 2 obs

● 2026-07-11 02:06:06
● 2026-07-18 19:53:52

●MXalt4.aspmx.l.google.com2026-07-11 → 2026-07-18 · 2 obs

● 2026-07-11 02:06:06
● 2026-07-18 19:53:52

●MXaspmx.l.google.com2026-07-11 → 2026-07-18 · 2 obs

● 2026-07-11 02:06:06
● 2026-07-18 19:53:52

●A104.21.44.2272026-07-11 → 2026-07-18 · 2 obs

● 2026-07-11 02:06:06
● 2026-07-18 19:53:52

●A172.67.204.1902026-07-11 → 2026-07-18 · 2 obs

● 2026-07-11 02:06:06
● 2026-07-18 19:53:52

●A2606:4700:3033::6815:2ce32026-07-11 → 2026-07-18 · 2 obs

● 2026-07-11 02:06:06
● 2026-07-18 19:53:52

●A2606:4700:3033::ac43:ccbe2026-07-11 → 2026-07-18 · 2 obs

● 2026-07-11 02:06:06
● 2026-07-18 19:53:52

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
vn	h.dns-servers.vn, e.dns-servers.vn, a.dns-servers.vn, c.dns-servers.vn...	-
citisys.vn	janet.ns.cloudflare.com, leonard.ns.cloudflare.com	-

✅ Authoritative Response

Server:108.162.195.54

NS records: janet.ns.cloudflare.com, leonard.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for citisys.vn (unsigned zone)

⏱️ Timing

Total: 1160ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.44.227, 172.67.204.190`
AAAA	2	`2606:4700:3033::ac43:ccbe, 2606:4700:3033::6815:2ce3`
NS	2	`janet.ns.cloudflare.com, leonard.ns.cloudflare.com`
MX	5	`aspmx.l.google.com (pri: 1), alt3.aspmx.l.google.com (pri: 10)...`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`janet.ns.cloudflare.com dns.cloudflare.c`

Analysis

Hierarchy

The domain gateway.citisys.vn falls under the parent citisys.vn.

IP Addresses

citisys.vn points to the four IP addresses 104.21.44.227, 172.67.204.190, 2606:4700:3033::6815:2ce3 and 2606:4700:3033::ac43:ccbe.

Two other host names, along with rodtires.com, smeg.com.au and sv388tong.cloud, also share IP numbers with citisys.vn.

Name Servers

citisys.vn is delegated to two name servers: janet.ns.cloudflare.com and leonard.ns.cloudflare.com.

citisys.vn shares its NS records with other domains, for example gigs.com.br, meda.et, rustfinity.com and two others.

At least some of citisys.vn's name servers are shared with other domains, for example business-inform.net, louisianataxlien.com, ancop.org and two more.

These name servers tend to be deployed in combination with the name servers susan.ns.cloudflare.com and wells.ns.cloudflare.com.

DNS names with 6 IP addresses:

janet.ns.cloudflare.com resolves to 108.162.192.169, 172.64.32.169, 173.245.58.169 and 3 other IP addresses.

leonard.ns.cloudflare.com resolves to 108.162.195.54, 162.159.44.54, 172.64.35.54 and 3 other IP addresses.

Mail Servers

citisys.vn has five mail servers, which are aspmx.l.google.com, alt1.aspmx.l.google.com, alt2.aspmx.l.google.com and two others.

There is at least a partial MX overlap between citisys.vn and other domains, including visiteverestrealty.com, the-redonion.co.uk, richardhatcher.com and two others.

These mail servers frequently co-occur with the mail servers alt3.aspmx.l.google.com, alt4.aspmx.l.google.com, aspmx2.googlemail.com and two others.

Host names that have two IP addresses:

aspmx.l.google.com points to 173.194.45.26 and 2607:f8b0:4004:c19::1b.

alt1.aspmx.l.google.com points to 108.177.123.27 and 2800:3f0:4003:c0f::1b.

alt2.aspmx.l.google.com points to 172.253.116.26 and 2a00:1450:400b:c02::1a.

alt3.aspmx.l.google.com points to 192.178.223.26 and 2a00:1450:4009:c0f::1a.

alt4.aspmx.l.google.com points to 172.253.157.26 and 2a00:1450:400c:c23::1a.