leetcode.study - dns.ninja

🛡️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=89, name=cloudflare-ech.com
SOA	`donald.ns.cloudflare.com`dns@cloudflare.com serial=2410429312

`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=1788763739

Same first word

Similar names

Previous names

Next names

DNS History

10 records (6 active, 4 former)

●NSdonald.ns.cloudflare.com2026-08-20 → 2026-09-07 · 2 obs

● 2026-08-20 05:12:54
● 2026-09-07 07:15:54

●NSjill.ns.cloudflare.com2026-08-20 → 2026-09-07 · 2 obs

● 2026-08-20 05:12:54
● 2026-09-07 07:15:54

●A104.21.39.442026-08-20 → 2026-09-07 · 14 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
● 2026-09-07 07:15:54

●A172.67.143.512026-08-20 → 2026-09-07 · 14 obs

○A188.114.96.02026-08-23 → 2026-09-05 · 14 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
○ 2026-09-07 07:15:54

○A188.114.97.02026-08-23 → 2026-09-05 · 14 obs

●A2606:4700:3032::ac43:8f332026-08-20 → 2026-09-07 · 14 obs

●A2606:4700:3034::6815:272c2026-08-20 → 2026-09-07 · 14 obs

○A2a06:98c1:3120::2026-08-23 → 2026-09-05 · 14 obs

○A2a06:98c1:3121::2026-08-23 → 2026-09-05 · 14 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: 2218ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.39.44, 172.67.143.51`
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 has four IP addresses: 104.21.39.44, 172.67.143.51, 2606:4700:3032::ac43:8f33 and 2606:4700:3034::6815:272c.

Additional host names — create99networks.pro, mail.amdbbs.com, ny644.com and two others — share IP numbers with leetcode.study.

Name Servers

DNS delegation for leetcode.study points to two name servers: donald.ns.cloudflare.com and jill.ns.cloudflare.com.

leetcode.study shares its name server setup with other domains, including a-l-ex6-046star.workers.dev, loyolavenderamb.quest, orbiviewer.cc and two others.

leetcode.study partially shares its NS delegation with several other domains, including infokod.com, dwellrobobrain.com, byam.co.uk and two others.

These name servers often co-occur with the name servers magnolia.ns.cloudflare.com.

Host names with 6 IP numbers:

donald.ns.cloudflare.com has IP addresses 108.162.193.158, 172.64.33.158 and 173.245.59.158, plus 3 other.

jill.ns.cloudflare.com has IP addresses 108.162.192.122, 172.64.32.122 and 173.245.58.122, plus 3 other.