`api.nextschool.vn`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::6815:15f3^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3031::ac43:c970^{🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.21.243^{Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.201.112^{🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.21.243, 172.67.201.112
		IPv6 hints	2606:4700:3030::6815:15f3, 2606:4700:3031::ac43:c970
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=92, name=cloudflare-ech.com

`nextschool.vn`

	DNSSEC	⚠️ Not signed
	A	185.158.133.1^{🇩🇪 Cloudflare185.158.133.0/24}
	NS	`abby.ns.cloudflare.com` ⭐
	NS	`andy.ns.cloudflare.com`
	SOA	`abby.ns.cloudflare.com`dns@cloudflare.com serial=2409506282

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DNS History

6 records (4 active, 2 former)

●A104.21.21.2432026-05-01 → 2026-07-17 · 2 obs

● 2026-05-01 13:51:12
● 2026-07-17 23:34:40

●A172.67.201.1122026-05-01 → 2026-07-17 · 2 obs

● 2026-05-01 13:51:12
● 2026-07-17 23:34:40

●A2606:4700:3030::6815:15f32026-06-23 → 2026-07-17 · 3 obs

○ 2026-06-02 10:58:24
● 2026-06-23 14:00:22
● 2026-07-17 23:34:40

○A2606:4700:3030::ac43:c9702026-05-01 → 2026-06-02 · 4 obs

● 2026-05-01 13:51:12
● 2026-06-02 10:58:24
○ 2026-06-23 14:00:22
○ 2026-07-17 23:34:40

●A2606:4700:3031::ac43:c9702026-06-23 → 2026-07-17 · 3 obs

○ 2026-06-02 10:58:24
● 2026-06-23 14:00:22
● 2026-07-17 23:34:40

○A2606:4700:3034::6815:15f32026-05-01 → 2026-06-02 · 4 obs

● 2026-05-01 13:51:12
● 2026-06-02 10:58:24
○ 2026-06-23 14:00:22
○ 2026-07-17 23:34:40

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
vn	a.dns-servers.vn, b.dns-servers.vn, c.dns-servers.vn, d.dns-servers.vn...	16 records
nextschool.vn	abby.ns.cloudflare.com, andy.ns.cloudflare.com	-

✅ Authoritative Response

Server:108.162.192.100

NS records: abby.ns.cloudflare.com, andy.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for nextschool.vn (unsigned zone)

⏱️ Timing

Total: 767ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.21.243, 172.67.201.112`
AAAA	2	`2606:4700:3030::6815:15f3, 2606:4700:3031::ac43:c970`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`

📌 Glue Records Collected

Total: 16

In-bailiwick: 16 (a.dns-servers.vn, a.dns-servers.vn, b.dns-servers.vn...)

Analysis

IP Addresses

api.nextschool.vn resolves to four IP addresses: 104.21.21.243, 172.67.201.112, 2606:4700:3030::6815:15f3 and 2606:4700:3031::ac43:c970.

58zfdao.com, slon-02.ru, lima-city.evisos.com.pe plus two other host names have IP numbers in common with api.nextschool.vn.

api.nextschool.vn - robtex.com