`certificationbusiness.school`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::6815:2a82^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3037::ac43:cddf^{🇺🇸 Cloudflare2606:4700:3037::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.42.130^{Cloudflare104.21.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.205.223^{🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`angelina.ns.cloudflare.com` ⭐
		A	2606:4700:50::a29f:26e8^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`angelina.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c2e8^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`angelina.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:22e8^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`angelina.ns.cloudflare.com`
		A	108.162.194.232^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`angelina.ns.cloudflare.com`
		A	162.159.38.232^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`angelina.ns.cloudflare.com`
		A	172.64.34.232^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`angelina.ns.cloudflare.com`
NS	`chris.ns.cloudflare.com`
		A	2606:4700:58::adf5:3b55^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`chris.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c155^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`chris.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2155^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`chris.ns.cloudflare.com`
		A	108.162.193.85^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`chris.ns.cloudflare.com`
		A	172.64.33.85^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`chris.ns.cloudflare.com`
		A	173.245.59.85^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`chris.ns.cloudflare.com`
MX	`mx.certificationbusiness.school` ⭐
		A	62.149.128.72^{🇮🇹 ARUBA-ASN62.149.128.0/19 Aruba S.p.A. Network}
			PTR	`mxd4.aruba.it`
		A	62.149.128.74^{🇮🇹 ARUBA-ASN62.149.128.0/19 Aruba S.p.A. Network}
			PTR	`mxd5.aruba.it`
		A	62.149.128.151^{🇮🇹 ARUBA-ASN62.149.128.0/19 Aruba S.p.A. Network}
			PTR	`mxd6.aruba.it`
		A	62.149.128.154^{🇮🇹 ARUBA-ASN62.149.128.0/19 Aruba S.p.A. Network}
			PTR	`mxd7.aruba.it`
		A	62.149.128.157^{🇮🇹 ARUBA-ASN62.149.128.0/19 Aruba S.p.A. Network}
			PTR	`mxd8.aruba.it`
		A	62.149.128.160^{🇮🇹 ARUBA-ASN62.149.128.0/19 Aruba S.p.A. Network}
			PTR	`mxd1.aruba.it`
		A	62.149.128.163^{🇮🇹 ARUBA-ASN62.149.128.0/19 Aruba S.p.A. Network}
			PTR	`mxd2.aruba.it`
		A	62.149.128.166^{🇮🇹 ARUBA-ASN62.149.128.0/19 Aruba S.p.A. Network}
			PTR	`mxd3.aruba.it`
TXT	`v=spf1 include:spf.sendinblue.com mx include:_6f23f8ebd20910869497220b07e73a3...`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.42.130, 172.67.205.223
		IPv6 hints	2606:4700:3030::6815:2a82, 2606:4700:3037::ac43:cddf
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=110, name=cloudflare-ech.com
SOA	`angelina.ns.cloudflare.com`dns@cloudflare.com serial=2402728036

`school`

	DNSSEC	🔒 Signed (DS record present)
	NS	`v0n0.nic.school` ⭐
	NS	`v0n1.nic.school`
	NS	`v0n2.nic.school`
	NS	`v0n3.nic.school`
	NS	`v2n0.nic.school`
	NS	`v2n1.nic.school`
	SOA	`v0n0.nic.school`hostmaster@donuts.email serial=1778349645

⚠️ On DNS blocklist: tif

Subdomains

www.certificationbusiness.school

Same first word

certificationbusiness.blogspot.nl

certificationbusiness.school

DNS History

7 records (7 active, 0 former)

●NSangelina.ns.cloudflare.com2026-05-06 → 2026-05-09 · 2 obs

● 2026-05-06 18:15:18
● 2026-05-09 18:31:00

●NSchris.ns.cloudflare.com2026-05-06 → 2026-05-09 · 2 obs

● 2026-05-06 18:15:18
● 2026-05-09 18:31:00

●MXmx.certificationbusiness.school2026-05-06 → 2026-05-09 · 2 obs

● 2026-05-06 18:15:18
● 2026-05-09 18:31:00

●A104.21.42.1302026-05-06 → 2026-05-09 · 2 obs

● 2026-05-06 18:15:18
● 2026-05-09 18:31:00

●A172.67.205.2232026-05-06 → 2026-05-09 · 2 obs

● 2026-05-06 18:15:18
● 2026-05-09 18:31:00

●A2606:4700:3030::6815:2a822026-05-06 → 2026-05-09 · 2 obs

● 2026-05-06 18:15:18
● 2026-05-09 18:31:00

●A2606:4700:3037::ac43:cddf2026-05-06 → 2026-05-09 · 2 obs

● 2026-05-06 18:15:18
● 2026-05-09 18:31:00

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
school	v0n0.nic.school, v0n1.nic.school, v0n2.nic.school, v0n3.nic.school...	12 records
certificationbusiness.school	chris.ns.cloudflare.com, angelina.ns.cloudflare.com	-

✅ Authoritative Response

Server:162.159.38.232

NS records: chris.ns.cloudflare.com, angelina.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for certificationbusiness.school (unsigned zone)

⏱️ Timing

Total: 344ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.42.130, 172.67.205.223`
AAAA	2	`2606:4700:3037::ac43:cddf, 2606:4700:3030::6815:2a82`
NS	2	`angelina.ns.cloudflare.com, chris.ns.cloudflare.com`
MX	1	`mx.certificationbusiness.school (pri: 10`
TXT	1	`v=spf1 include:spf.sendinblue.com mx inc`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`angelina.ns.cloudflare.com dns.cloudflar`

📌 Glue Records Collected

Total: 12

In-bailiwick: 12 (v0n0.nic.school, v0n1.nic.school, v0n2.nic.school...)

Analysis

Hierarchy

certificationbusiness.school is the parent of www.certificationbusiness.school.

IP Addresses

certificationbusiness.school points to four IP numbers: 2606:4700:3030::6815:2a82, 2606:4700:3037::ac43:cddf, 104.21.42.130 and 172.67.205.223.

For instance, other host names www.activeplc.com, dns-2.cae-ebc.com, rotorsoft.org, zepfilms.com and bargainmarge.com share IP numbers with certificationbusiness.school.

Name Servers

certificationbusiness.school is delegated to two name servers: angelina.ns.cloudflare.com and chris.ns.cloudflare.com.

certificationbusiness.school uses the same name server setup as other domains such as campingcaladostia.com, fitavatrading.com, njqit.com, ordinadalmenu.it and hrczone.com.

certificationbusiness.school shares name servers with other domains at least partially, for example stat-data.com, abet.ru, orthofriedrich.at, pacificinstitute.com.au and tdskv-whatsapp.hl.cn.

These name servers are commonly used with norm.ns.cloudflare.com.

Host names with six IP numbers: host name angelina.ns.cloudflare.com points to: 2606:4700:50::a29f:26e8, 2803:f800:50::6ca2:c2e8, 2a06:98c1:50::ac40:22e8, 108.162.194.232, 162.159.38.232 and 172.64.34.232; host name chris.ns.cloudflare.com points to: 2606:4700:58::adf5:3b55, 2803:f800:50::6ca2:c155, 2a06:98c1:50::ac40:2155, 108.162.193.85, 172.64.33.85 and 173.245.59.85.

Mail Servers

certificationbusiness.school is handled by a single mail server, mx.certificationbusiness.school.

Host name mx.certificationbusiness.school points to eight IP numbers: 62.149.128.72, 62.149.128.74, 62.149.128.151, 62.149.128.154, 62.149.128.157, 62.149.128.160, 62.149.128.163 and 62.149.128.166.

certificationbusiness.school - robtex.com