🛡️Domain Reputation CheckBlocklist, phishing & malware status→

`leetcode.study`

DNSSEC	⚠️ Not signed
A	2606:4700:3032::ac43:8f33^{🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3034::6815:272c^{🇺🇸 Cloudflare2606:4700:3034::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.39.44^{Cloudflare104.21.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.143.51^{🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`donald.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3b9e^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`donald.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c19e^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`donald.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:219e^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`donald.ns.cloudflare.com`
		A	108.162.193.158^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`donald.ns.cloudflare.com`
		A	172.64.33.158^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`donald.ns.cloudflare.com`
		A	173.245.59.158^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`donald.ns.cloudflare.com`
NS	`jill.ns.cloudflare.com`
		A	2606:4700:50::adf5:3a7a^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jill.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c07a^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`jill.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:207a^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`jill.ns.cloudflare.com`
		A	108.162.192.122^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jill.ns.cloudflare.com`
		A	172.64.32.122^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jill.ns.cloudflare.com`
		A	173.245.58.122^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jill.ns.cloudflare.com`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.39.44, 172.67.143.51
		IPv6 hints	2606:4700:3032::ac43:8f33, 2606:4700:3034::6815:272c
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=122, name=cloudflare-ech.com
SOA	`donald.ns.cloudflare.com`dns@cloudflare.com serial=2415532793

`study`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.nic.study` ⭐
	NS	`b.nic.study`
	NS	`c.nic.study`
	NS	`x.nic.study`
	NS	`y.nic.study`
	NS	`z.nic.study`
	SOA	`a.nic.study`admin@tldns.godaddy serial=1791029692

Same first word

Similar names

Previous names

Next names

DNS History

10 records (6 active, 4 former)

●NSdonald.ns.cloudflare.com2026-08-20 → 2026-10-03 · 2 obs

● 2026-08-20 05:12:54
● 2026-10-03 13:01:14

●NSjill.ns.cloudflare.com2026-08-20 → 2026-10-03 · 2 obs

● 2026-08-20 05:12:54
● 2026-10-03 13:01:14

●A104.21.39.442026-08-20 → 2026-10-03 · 20 obs

● 2026-08-20 05:12:54
○ 2026-08-23 16:14:16
● 2026-08-24 18:07:40
○ 2026-08-27 17:59:24
● 2026-08-27 18:55:10
○ 2026-08-30 17:30:26
● 2026-08-31 13:06:08
○ 2026-08-31 22:50:52
● 2026-09-01 02:24:42
○ 2026-09-01 22:25:24
● 2026-09-04 04:45:18
○ 2026-09-05 16:49:58
● 2026-09-07 07:15:52
○ 2026-09-09 19:26:14
● 2026-09-11 07:50:52
○ 2026-09-13 21:10:56
● 2026-09-13 22:10:36
○ 2026-09-22 18:00:02
● 2026-09-28 20:56:26
● 2026-10-03 13:01:14

●A172.67.143.512026-08-20 → 2026-10-03 · 20 obs

○A188.114.96.02026-08-23 → 2026-09-22 · 20 obs

○ 2026-08-20 05:12:54
● 2026-08-23 16:14:16
○ 2026-08-24 18:07:40
● 2026-08-27 17:59:24
○ 2026-08-27 18:55:10
● 2026-08-30 17:30:26
○ 2026-08-31 13:06:08
● 2026-08-31 22:50:52
○ 2026-09-01 02:24:42
● 2026-09-01 22:25:24
○ 2026-09-04 04:45:18
● 2026-09-05 16:49:58
○ 2026-09-07 07:15:52
● 2026-09-09 19:26:14
○ 2026-09-11 07:50:52
● 2026-09-13 21:10:56
○ 2026-09-13 22:10:36
● 2026-09-22 18:00:02
○ 2026-09-28 20:56:26
○ 2026-10-03 13:01:14

○A188.114.97.02026-08-23 → 2026-09-22 · 20 obs

●A2606:4700:3032::ac43:8f332026-08-20 → 2026-10-03 · 20 obs

●A2606:4700:3034::6815:272c2026-08-20 → 2026-10-03 · 20 obs

○A2a06:98c1:3120::2026-08-23 → 2026-09-22 · 20 obs

○A2a06:98c1:3121::2026-08-23 → 2026-09-22 · 20 obs

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
study	z.nic.study, x.nic.study, b.nic.study, y.nic.study...	12 records
leetcode.study	jill.ns.cloudflare.com, donald.ns.cloudflare.com	-

✅ Authoritative Response

Server:173.245.58.122

NS records: jill.ns.cloudflare.com, donald.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for leetcode.study (unsigned zone)

⏱️ Timing

Total: 1431ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.143.51, 104.21.39.44`
AAAA	2	`2606:4700:3032::ac43:8f33, 2606:4700:3034::6815:272c`
NS	2	`donald.ns.cloudflare.com, jill.ns.cloudflare.com`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`donald.ns.cloudflare.com dns.cloudflare.`

📌 Glue Records Collected

Total: 12

In-bailiwick: 12 (z.nic.study, z.nic.study, x.nic.study...)

Analysis

IP Addresses

leetcode.study points to the four IP addresses 104.21.39.44, 172.67.143.51, 2606:4700:3032::ac43:8f33 and 2606:4700:3034::6815:272c.

Among the host names that share IP numbers with leetcode.study are landfreedomoffers.com, vintagecapfunds.info, create99networks.pro and two others.

Name Servers

leetcode.study is served by two delegated name servers, donald.ns.cloudflare.com and jill.ns.cloudflare.com.

leetcode.study has the same name server delegation as a number of other domains, such as a-l-ex6-046star.workers.dev, loyolavenderamb.quest, d-degtyar.top and two more.

There is at least partial name server overlap between leetcode.study and other domains — dominikveres.workers.dev, infokod.com, dwellrobobrain.com and two more among them.

The name servers magnolia.ns.cloudflare.com, lucy.ns.cloudflare.com and daphne.ns.cloudflare.com are often found in combination with these name servers.

Host names resolving to 6 IP numbers:

donald.ns.cloudflare.com carries IP addresses 108.162.193.158, 172.64.33.158 and 173.245.59.158, with 3 other addresses beyond those.

jill.ns.cloudflare.com carries IP addresses 108.162.192.122, 172.64.32.122 and 173.245.58.122, with 3 other addresses beyond those.

leetcode.study - robtex.com

leetcode.study

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