`ustack.app`

DNSSEC	⚠️ Not signed
A	2606:4700:3032::ac43:d764^{🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3037::6815:3dd3^{🇺🇸 Cloudflare2606:4700:3037::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.61.211^{Cloudflare104.21.48.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.215.100^{🇺🇸 Cloudflare172.67.208.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`rex.ns.cloudflare.com` ⭐
		A	2606:4700:58::a29f:2c0d^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`rex.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c30d^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`rex.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:230d^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`rex.ns.cloudflare.com`
		A	108.162.195.13^{🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`rex.ns.cloudflare.com`
		A	162.159.44.13^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`rex.ns.cloudflare.com`
		A	172.64.35.13^{🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`rex.ns.cloudflare.com`
NS	`samara.ns.cloudflare.com`
		A	2606:4700:50::a29f:26a0^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`samara.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c2a0^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`samara.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:22a0^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`samara.ns.cloudflare.com`
		A	108.162.194.160^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`samara.ns.cloudflare.com`
		A	162.159.38.160^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`samara.ns.cloudflare.com`
		A	172.64.34.160^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`samara.ns.cloudflare.com`
MX	`route2.mx.cloudflare.net` ⭐
		A	2606:4700:f5::e^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	2606:4700:f5::f^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	2606:4700:f5::10^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.17^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.18^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.19^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
MX	`route3.mx.cloudflare.net`⁽⁴⁰⁾
		A	2606:4700:f5::11^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	2606:4700:f5::12^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	2606:4700:f5::13^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.23^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.24^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.25^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
MX	`route1.mx.cloudflare.net`⁽⁶⁹⁾
		A	2606:4700:f5::b^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	2606:4700:f5::c^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	2606:4700:f5::d^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.11^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.12^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.13^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
TXT	`google-site-verification=1rajCsULWZbeKUpsT779_G29lARiqPeis5HKk80aFGg`
TXT	`v=spf1 include:_spf.mx.cloudflare.net ~all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.61.211, 172.67.215.100
		IPv6 hints	2606:4700:3032::ac43:d764, 2606:4700:3037::6815:3dd3
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=169, name=cloudflare-ech.com
SOA	`rex.ns.cloudflare.com`dns@cloudflare.com serial=2408316187

`app`

	DNSSEC	🔒 Signed (DS record present)
	NS	`ns-tld1.charlestonroadregistry.com` ⭐
	NS	`ns-tld2.charlestonroadregistry.com`
	NS	`ns-tld3.charlestonroadregistry.com`
	NS	`ns-tld4.charlestonroadregistry.com`
	NS	`ns-tld5.charlestonroadregistry.com`
	SOA	`ns-tld1.charlestonroadregistry.com`cloud-dns-hostmaster@google.com serial=101427

🔒 HSTS Preload (+subdomains)

Same first word

ustack.app

ustack.com

Similar names

caktus.ru

sactuk.com

ctkusa.org

kactus.nl

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kactus.com.hk

caktus.com

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ksucta.kg

caktus.ai

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ukcast.net

kactus.cz

tackus.com

kactus.org

caktus.es

skucat.com

ukcast.com

caktus.net

kactus.it

caktus.cz

kctusa.org

kucast.com

ktcusa.com

caktus.fr

kctusa.com

caktus.co

caktus.eu

kactus.es

acktus.com

ksucat.com

ukcats.com

stucka.com

caktus.be

castuk.co.uk

taucks.com

kactus.eu

askcut.com

ukctas.net

castuk.com

kactus.de

kactus.pw

tascuk.com

ktcusa.org

kactus.fr

kcutsa.com

acktus.se

akcuts.com

caktus.de

castku.com

stacku.com

ukcats.org

csutak.com

kactus.co

satuck.com

caktus.nl

kactus.com

kstuca.kharkov.ua

kucast.co.uk

caktus.me

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DNS History

10 records (9 active, 1 former)

●NSrex.ns.cloudflare.com2026-05-25 → 2026-07-15 · 2 obs

● 2026-05-25 21:52:48
● 2026-07-15 20:22:02

●NSsamara.ns.cloudflare.com2026-05-25 → 2026-07-15 · 2 obs

● 2026-05-25 21:52:48
● 2026-07-15 20:22:02

●MXroute1.mx.cloudflare.net2026-05-25 → 2026-07-15 · 2 obs

● 2026-05-25 21:52:48
● 2026-07-15 20:22:02

●MXroute2.mx.cloudflare.net2026-05-25 → 2026-07-15 · 2 obs

● 2026-05-25 21:52:48
● 2026-07-15 20:22:02

●MXroute3.mx.cloudflare.net2026-05-25 → 2026-07-15 · 2 obs

● 2026-05-25 21:52:48
● 2026-07-15 20:22:02

●A104.21.61.2112026-05-25 → 2026-07-15 · 2 obs

● 2026-05-25 21:52:48
● 2026-07-15 20:22:02

●A172.67.215.1002026-05-25 → 2026-07-15 · 2 obs

● 2026-05-25 21:52:48
● 2026-07-15 20:22:02

●A2606:4700:3032::ac43:d7642026-06-20 → 2026-07-15 · 3 obs

○ 2026-06-16 23:54:14
● 2026-06-20 00:15:44
● 2026-07-15 20:22:02

○A2606:4700:3034::ac43:d7642026-05-25 → 2026-06-16 · 4 obs

● 2026-05-25 21:52:48
● 2026-06-16 23:54:14
○ 2026-06-20 00:15:44
○ 2026-07-15 20:22:02

●A2606:4700:3037::6815:3dd32026-05-25 → 2026-07-15 · 2 obs

● 2026-05-25 21:52:48
● 2026-07-15 20:22:02

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
app	ns-tld2.charlestonroadregistry.com, ns-tld4.charlestonroadregistry.com, ns-tld3.charlestonroadregistry.com, ns-tld1.charlestonroadregistry.com...	10 records
ustack.app	samara.ns.cloudflare.com, rex.ns.cloudflare.com	-

✅ Authoritative Response

Server:108.162.194.160

NS records: samara.ns.cloudflare.com, rex.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for ustack.app (unsigned zone)

⏱️ Timing

Total: 4618ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.215.100, 104.21.61.211`
AAAA	2	`2606:4700:3037::6815:3dd3, 2606:4700:3032::ac43:d764`
NS	2	`rex.ns.cloudflare.com, samara.ns.cloudflare.com`
MX	3	`route2.mx.cloudflare.net (pri: 36), route3.mx.cloudflare.net (pri: 40)...`
TXT	2	`google-site-verification=1rajCsULWZbeKUp, v=spf1 include:_spf.mx.cloudflare.net ~a`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`rex.ns.cloudflare.com dns.cloudflare.com`

📌 Glue Records Collected

Total: 10

Out-of-bailiwick: 10 (ns-tld2.charlestonroadregistry.com, ns-tld2.charlestonroadregistry.com, ns-tld4.charlestonroadregistry.com...)

Analysis

IP Addresses

ustack.app directs to four IP numbers, which are 104.21.61.211, 172.67.215.100, 2606:4700:3032::ac43:d764 and 2606:4700:3037::6815:3dd3.

Among the host names that share IP numbers with ustack.app are cv-mallar.nu, wildo.blog, mentoriamapa.alemdospassos.com.br and two others.

Name Servers

DNS delegation for ustack.app points to two name servers: rex.ns.cloudflare.com and samara.ns.cloudflare.com.

ustack.app and other domains — dasmio.com, fmgdenver.com and hidden-zenith.com among them — share the same NS delegation.

There is at least partial name server overlap between ustack.app and other domains — c5xve.top, paidly.site, inboxsurat.com and two more among them.

The name servers tony.ns.cloudflare.com, heather.ns.cloudflare.com and ligia.ns.cloudflare.com are often found in combination with these name servers.

Host names resolving to 6 IP numbers:

rex.ns.cloudflare.com has IP addresses 108.162.195.13, 162.159.44.13 and 172.64.35.13, plus 3 other.

samara.ns.cloudflare.com has IP addresses 108.162.194.160, 162.159.38.160 and 172.64.34.160, plus 3 other.

Mail Servers

Incoming mail for ustack.app is delivered via three mail servers: route1.mx.cloudflare.net, route2.mx.cloudflare.net and route3.mx.cloudflare.net.

ustack.app shares at least some of its mail servers with other domains — for example (0x736578)-prague.com, weldcm.com, mark25llc.com and two more.

Host names resolving to 6 IP numbers:

route1.mx.cloudflare.net has IP addresses 162.159.205.11, 162.159.205.12 and 162.159.205.13, plus 3 other.

route2.mx.cloudflare.net has IP addresses 162.159.205.17, 162.159.205.18 and 162.159.205.19, plus 3 other.

route3.mx.cloudflare.net has IP addresses 162.159.205.23, 162.159.205.24 and 162.159.205.25, plus 3 other.

ustack.app - robtex.com

ustack.app

app

Same first word

Similar names

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

📌 Glue Records Collected

Analysis

IP Addresses

Name Servers

Mail Servers

`ustack.app`

`app`