`studer.dev`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::ac43:cc0e^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3032::6815:3a85^{🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.58.133^{Cloudflare104.21.48.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.204.14^{🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`eric.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3b70^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`eric.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c170^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`eric.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2170^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`eric.ns.cloudflare.com`
		A	108.162.193.112^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`eric.ns.cloudflare.com`
		A	172.64.33.112^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`eric.ns.cloudflare.com`
		A	173.245.59.112^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`eric.ns.cloudflare.com`
NS	`lisa.ns.cloudflare.com`
		A	2606:4700:50::adf5:3a83^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`lisa.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c083^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`lisa.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2083^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`lisa.ns.cloudflare.com`
		A	108.162.192.131^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`lisa.ns.cloudflare.com`
		A	172.64.32.131^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`lisa.ns.cloudflare.com`
		A	173.245.58.131^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`lisa.ns.cloudflare.com`
MX	`mail.studer.dev` ⭐
TXT	`google-site-verification=mlCKjTHjVft6DimXvYSu-0ZQNKeBjZF-OsjvQ_zEP1Y`
TXT	`v=spf1 include:_spf.studer.dev ~all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.58.133, 172.67.204.14
		IPv6 hints	2606:4700:3030::ac43:cc0e, 2606:4700:3032::6815:3a85
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=80, name=cloudflare-ech.com
SOA	`eric.ns.cloudflare.com`dns@cloudflare.com serial=2403565322

`dev`

	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=1

🔒 HSTS Preload (+subdomains)

Subdomains

mail.studer.dev

Same first word

studer.ca

studer.org

studer.at

studer.world

studer.nu

studer.co.ke

studer.info

studer.us

studer.me

studer.net

studer.ru

studer.com

studer.eu

studer.ch

studer.dev

studer.com.pl

studer.cn

studer.agency

studer.in

studer.de

studer.archi

studer.fr

studer.se

studer.xyz

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suerdt.com

sterud.com

duster.ch

trueds.io

duster.me

rudest.com

duster.com.br

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rusted.co

utrsed.com

duster.fr

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duster.de

dersut.org

durest.com

rusted.xyz

rudets.com

dersut.info

trudes.co.uk

destur.com.cn

tuders.de

edstur.com

duster.sk

derust.nl

trudes.net

duerst.de

dersut.net

dersut.coffee

tusder.com

sterud.be

rusted.su

rudest.net

rusted.co.uk

duster.nl

studre.ru

restud.org

rtsedu.com

destur.org

duster.by

rusted.com.au

dstrue.com

trsedu.com

reduts.com.py

rusted.de

duerst.eu

sturde.com

rusted.org

udtres.ru

surdet.com

duster.ru

duster.us

rusted.pl

destru.com

restud.co.uk

duster.se

tersud.com

derust.co.za

reduts.fr

durtes.com.tr

dersut.sk

derust.com

tresud.ru

duerst.events

edutrs.com

dertus.com

rusted.net

dtuser.com

duster.in

trueds.nl

dtsure.net

destur.com

reduts.com.uy

duster.co.uk

reduts.com

dersut.com

duster.com

reduts.net

rusted.cc

duster.jp

detrus.com

rusted.se

trudes.se

duerst.org

duster.it

duster.be

duster.co.jp

DNS History

15 records (7 active, 8 former)

●NSeric.ns.cloudflare.com2020-03-09 → 2026-05-09 · 2 obs

● 2020-03-09 05:22:20
● 2026-05-09 20:33:34

●NSlisa.ns.cloudflare.com2020-03-09 → 2026-05-09 · 2 obs

● 2020-03-09 05:22:20
● 2026-05-09 20:33:34

●MXmail.studer.dev2020-03-09 → 2026-05-09 · 2 obs

● 2020-03-09 05:22:20
● 2026-05-09 20:33:34

●A104.21.58.1332026-05-09 → 2026-05-09 · 2 obs

○ 2026-04-13 16:43:08
● 2026-05-09 20:33:34

○A104.27.128.882020-03-09 → 2020-03-09 · 3 obs

● 2020-03-09 05:22:20
○ 2026-03-03 11:42:22
○ 2026-05-09 20:33:34

○A104.27.129.882020-03-09 → 2020-03-09 · 3 obs

● 2020-03-09 05:22:20
○ 2026-03-03 11:42:22
○ 2026-05-09 20:33:34

●A172.67.204.142026-05-09 → 2026-05-09 · 2 obs

○ 2026-04-13 16:43:08
● 2026-05-09 20:33:34

○A188.114.96.02026-03-03 → 2026-04-13 · 4 obs

○ 2020-03-09 05:22:20
● 2026-03-03 11:42:22
● 2026-04-13 16:43:08
○ 2026-05-09 20:33:34

○A188.114.97.02026-03-03 → 2026-04-13 · 4 obs

○ 2020-03-09 05:22:20
● 2026-03-03 11:42:22
● 2026-04-13 16:43:08
○ 2026-05-09 20:33:34

●A2606:4700:3030::ac43:cc0e2026-05-09 → 2026-05-09 · 2 obs

○ 2026-04-13 16:43:08
● 2026-05-09 20:33:34

●A2606:4700:3032::6815:3a852026-05-09 → 2026-05-09 · 2 obs

○ 2026-04-13 16:43:08
● 2026-05-09 20:33:34

○A2606:4700:3033::681b:81582020-03-09 → 2020-03-09 · 3 obs

● 2020-03-09 05:22:20
○ 2026-03-03 11:42:22
○ 2026-05-09 20:33:34

○A2606:4700:3035::681b:80582020-03-09 → 2020-03-09 · 3 obs

● 2020-03-09 05:22:20
○ 2026-03-03 11:42:22
○ 2026-05-09 20:33:34

○A2a06:98c1:3120::2026-03-03 → 2026-04-13 · 4 obs

○ 2020-03-09 05:22:20
● 2026-03-03 11:42:22
● 2026-04-13 16:43:08
○ 2026-05-09 20:33:34

○A2a06:98c1:3121::2026-03-03 → 2026-04-13 · 4 obs

○ 2020-03-09 05:22:20
● 2026-03-03 11:42:22
● 2026-04-13 16:43:08
○ 2026-05-09 20:33:34

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
dev	ns-tld1.charlestonroadregistry.com, ns-tld5.charlestonroadregistry.com, ns-tld4.charlestonroadregistry.com, ns-tld2.charlestonroadregistry.com...	-
studer.dev	lisa.ns.cloudflare.com, eric.ns.cloudflare.com	-

✅ Authoritative Response

Server:172.64.33.112

NS records: lisa.ns.cloudflare.com, eric.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for studer.dev (unsigned zone)

⏱️ Timing

Total: 651ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.204.14, 104.21.58.133`
AAAA	2	`2606:4700:3030::ac43:cc0e, 2606:4700:3032::6815:3a85`
NS	2	`eric.ns.cloudflare.com, lisa.ns.cloudflare.com`
MX	1	`mail.studer.dev (pri: 1)`
TXT	2	`google-site-verification=mlCKjTHjVft6Dim, v=spf1 include:_spf.studer.dev ~all`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`eric.ns.cloudflare.com dns.cloudflare.co`

Analysis

Hierarchy

studer.dev is a parent of mail.studer.dev.

IP Addresses

studer.dev points to four IP numbers: 2606:4700:3030::ac43:cc0e, 2606:4700:3032::6815:3a85, 104.21.58.133 and 172.67.204.14.

Other host names, for instance bath.black, goldenrubygames.com, artekaritim.com.tr, cityrent-online.de and hugnjump.com share IP numbers with studer.dev.

Name Servers

Delegation for studer.dev rests with two name servers, eric.ns.cloudflare.com and lisa.ns.cloudflare.com.

studer.dev shares the same name server setup as other domains, including jangafx.com, lerenaissance.ca, unimac.gr, el-jouren.se and justicehardcore.com.

studer.dev at least partially shares name servers with other domains, for instance lasagna.horse, fishfromgreece.com, artbydirk.com, pkdavies.co.uk and cerebrawl.com.

These name servers are commonly used with ken.ns.cloudflare.com and kay.ns.cloudflare.com.

Host names with six IP numbers: eric.ns.cloudflare.com points to: 2606:4700:58::adf5:3b70, 2803:f800:50::6ca2:c170, 2a06:98c1:50::ac40:2170, 108.162.193.112, 172.64.33.112 and 173.245.59.112. lisa.ns.cloudflare.com points to: 2606:4700:50::adf5:3a83, 2803:f800:50::6ca2:c083, 2a06:98c1:50::ac40:2083, 108.162.192.131, 172.64.32.131 and 173.245.58.131.

Mail Servers

studer.dev is handled by a single mail server, mail.studer.dev.

studer.dev uses the same mail server setup as other domains, such as myhomework.space.

studer.dev - robtex.com

studer.dev

dev

Subdomains

Same first word

Similar names

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

Analysis

Hierarchy

IP Addresses

Name Servers

Mail Servers

`studer.dev`

`dev`