`free-courses.dev`

DNSSEC	⚠️ Not signed
A	2606:4700:3031::ac43:c4bb^{🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3037::6815:2218^{🇺🇸 Cloudflare2606:4700:3037::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.34.24^{Cloudflare104.21.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.196.187^{🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`maxim.ns.cloudflare.com` ⭐
		A	2606:4700:58::a29f:2cc6^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`maxim.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c3c6^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`maxim.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:23c6^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`maxim.ns.cloudflare.com`
		A	108.162.195.198^{🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`maxim.ns.cloudflare.com`
		A	162.159.44.198^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`maxim.ns.cloudflare.com`
		A	172.64.35.198^{🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`maxim.ns.cloudflare.com`
NS	`nelci.ns.cloudflare.com`
		A	2606:4700:50::a29f:2698^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`nelci.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c298^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`nelci.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2298^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`nelci.ns.cloudflare.com`
		A	108.162.194.152^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`nelci.ns.cloudflare.com`
		A	162.159.38.152^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`nelci.ns.cloudflare.com`
		A	172.64.34.152^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`nelci.ns.cloudflare.com`
MX	`route3.mx.cloudflare.net` ⭐
		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	`route2.mx.cloudflare.net`⁽⁷⁰⁾
		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	`route1.mx.cloudflare.net`⁽⁸²⁾
		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	`v=spf1 include:_spf.mx.cloudflare.net ~all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.34.24, 172.67.196.187
		IPv6 hints	2606:4700:3031::ac43:c4bb, 2606:4700:3037::6815:2218
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=104, name=cloudflare-ech.com
SOA	`maxim.ns.cloudflare.com`dns@cloudflare.com serial=2398494018

`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

api.free-courses.dev

Same first word

free-courses.top

free-courses.dev

free-courses.com

Similar names

free-sources.blogspot.com

courses-free.com

DNS History

9 records (9 active, 0 former)

●NSmaxim.ns.cloudflare.com2026-04-01 → 2026-04-02 · 2 obs

● 2026-04-01 07:25:28
● 2026-04-02 10:18:12

●NSnelci.ns.cloudflare.com2026-04-01 → 2026-04-02 · 2 obs

● 2026-04-01 07:25:28
● 2026-04-02 10:18:12

●MXroute1.mx.cloudflare.net2026-04-01 → 2026-04-02 · 2 obs

● 2026-04-01 07:25:28
● 2026-04-02 10:18:12

●MXroute2.mx.cloudflare.net2026-04-01 → 2026-04-02 · 2 obs

● 2026-04-01 07:25:28
● 2026-04-02 10:18:12

●MXroute3.mx.cloudflare.net2026-04-01 → 2026-04-02 · 2 obs

● 2026-04-01 07:25:28
● 2026-04-02 10:18:12

●A104.21.34.242026-04-01 → 2026-04-02 · 2 obs

● 2026-04-01 07:25:28
● 2026-04-02 10:18:12

●A172.67.196.1872026-04-01 → 2026-04-02 · 2 obs

● 2026-04-01 07:25:28
● 2026-04-02 10:18:12

●A2606:4700:3031::ac43:c4bb2026-04-01 → 2026-04-02 · 2 obs

● 2026-04-01 07:25:28
● 2026-04-02 10:18:12

●A2606:4700:3037::6815:22182026-04-01 → 2026-04-02 · 2 obs

● 2026-04-01 07:25:28
● 2026-04-02 10:18:12

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
dev	ns-tld1.charlestonroadregistry.com, ns-tld2.charlestonroadregistry.com, ns-tld3.charlestonroadregistry.com, ns-tld4.charlestonroadregistry.com...	10 records
free-courses.dev	maxim.ns.cloudflare.com, nelci.ns.cloudflare.com	-

✅ Authoritative Response

Server:172.64.34.152

NS records: maxim.ns.cloudflare.com, nelci.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for free-courses.dev (unsigned zone)

⏱️ Timing

Total: 681ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.34.24, 172.67.196.187`
AAAA	2	`2606:4700:3031::ac43:c4bb, 2606:4700:3037::6815:2218`
NS	2	`maxim.ns.cloudflare.com, nelci.ns.cloudflare.com`
MX	3	`route3.mx.cloudflare.net (pri: 7), route2.mx.cloudflare.net (pri: 70)...`
TXT	1	`v=spf1 include:_spf.mx.cloudflare.net ~a`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`maxim.ns.cloudflare.com dns.cloudflare.c`

📌 Glue Records Collected

Total: 10

Out-of-bailiwick: 10 (ns-tld1.charlestonroadregistry.com, ns-tld2.charlestonroadregistry.com, ns-tld3.charlestonroadregistry.com...)

Analysis

Hierarchy

The parent of api.free-courses.dev is free-courses.dev.

IP Addresses

free-courses.dev maps to four IP numbers: 2606:4700:3031::ac43:c4bb, 2606:4700:3037::6815:2218, 104.21.34.24 and 172.67.196.187.

other host names include maridesk.com, kabarkampus.id, buntogelreward.com, api.free-courses.dev and ty1722.com; they share IP numbers with free-courses.dev.

Name Servers

Two name servers maxim.ns.cloudflare.com and nelci.ns.cloudflare.com handle the delegation for free-courses.dev.

free-courses.dev shares the same name server setup as other domains, for instance obukhov.kyiv.ua, stroimdom.kr.ua, goledu.ir, pin-up-azer.com and samrem.kharkiv.ua.

free-courses.dev at least partially shares name servers with other domains, for instance snbzj.cn, gptpermax.net, promovare-site.biz, jettools.bg and painelnetempresapj.com.

These name servers are commonly used alongside fattouche.ns.cloudflare.com.

Six IP addresses per host:

maxim.ns.cloudflare.com points to 2606:4700:58::a29f:2cc6, 2803:f800:50::6ca2:c3c6, 2a06:98c1:50::ac40:23c6, 108.162.195.198, 162.159.44.198 and 172.64.35.198; nelci.ns.cloudflare.com points to 2606:4700:50::a29f:2698, 2803:f800:50::6ca2:c298, 2a06:98c1:50::ac40:2298, 108.162.194.152, 162.159.38.152 and 172.64.34.152

Mail Servers

Three mail servers handle free-courses.dev: route1.mx.cloudflare.net, route2.mx.cloudflare.net and route3.mx.cloudflare.net.

free-courses.dev shares at least partially some mail servers with other domains, for instance sutlac.com, programmer.help, klabbe.net, u2b.eu and cbici.ca.

Host names with six IP numbers:

- route1.mx.cloudflare.net points to 2606:4700:f5::b, 2606:4700:f5::c, 2606:4700:f5::d, 162.159.205.11, 162.159.205.12 and 162.159.205.13

- route2.mx.cloudflare.net points to 2606:4700:f5::e, 2606:4700:f5::f, 2606:4700:f5::10, 162.159.205.17, 162.159.205.18 and 162.159.205.19

- route3.mx.cloudflare.net points to 2606:4700:f5::11, 2606:4700:f5::12, 2606:4700:f5::13, 162.159.205.23, 162.159.205.24 and 162.159.205.25

free-courses.dev - robtex.com

free-courses.dev

dev

Subdomains

Same first word

Similar names

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

📌 Glue Records Collected

Analysis

Hierarchy

IP Addresses

Name Servers

Mail Servers

`free-courses.dev`

`dev`