`gradebook.app`

DNSSEC	🔒 Signed (DS record present)
A	2606:4700:3034::ac43:b679^{🇺🇸 Cloudflare2606:4700:3034::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3035::6815:43e5^{🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.67.229^{Cloudflare104.21.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.182.121^{🇺🇸 Cloudflare172.67.176.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`rita.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3a8c^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`rita.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c08c^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`rita.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:208c^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`rita.ns.cloudflare.com`
		A	108.162.192.140^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`rita.ns.cloudflare.com`
		A	172.64.32.140^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`rita.ns.cloudflare.com`
		A	173.245.58.140^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`rita.ns.cloudflare.com`
NS	`walt.ns.cloudflare.com`
		A	2606:4700:58::adf5:3b94^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`walt.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c194^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`walt.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2194^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`walt.ns.cloudflare.com`
		A	108.162.193.148^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`walt.ns.cloudflare.com`
		A	172.64.33.148^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`walt.ns.cloudflare.com`
		A	173.245.59.148^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`walt.ns.cloudflare.com`
MX	`mx2.zoho.com` ⭐
		A	204.141.33.44^{🇺🇸 ZohoAS204.141.32.0/23 PNAP-DAL CASE00103239}
			PTR	`mx2.zoho.com`
			PTR	`mx3.zoho.com`
			PTR	`mx6.zoho.com`
			PTR	`mx7.zoho.com`
			PTR	`mx8.zoho.com`
			PTR	`mx.zoho.com`
			PTR	`mx2.zohomail.com`
			PTR	`mx3.zohomail.com`
			PTR	`mx.zohomail.com`
MX	`mx3.zoho.com`⁽²⁰⁾
		A	136.143.191.44^{🇺🇸 ZohoAS136.143.190.0/23 Zoho Corporation}
			PTR	`mx2.zoho.com`
			PTR	`mx3.zoho.com`
			PTR	`mx.zoho.com`
			PTR	`mx2.zohomail.com`
			PTR	`mx3.zohomail.com`
			PTR	`mx.zohomail.com`
MX	`mx.zoho.com`⁽⁵⁰⁾
		A	136.143.191.44^{🇺🇸 ZohoAS136.143.190.0/23 Zoho Corporation}
			PTR	`mx2.zoho.com`
			PTR	`mx3.zoho.com`
			PTR	`mx.zoho.com`
			PTR	`mx2.zohomail.com`
			PTR	`mx3.zohomail.com`
			PTR	`mx.zohomail.com`
		A	204.141.33.44^{🇺🇸 ZohoAS204.141.32.0/23 PNAP-DAL CASE00103239}
			PTR	`mx2.zoho.com`
			PTR	`mx3.zoho.com`
			PTR	`mx6.zoho.com`
			PTR	`mx7.zoho.com`
			PTR	`mx8.zoho.com`
			PTR	`mx.zoho.com`
			PTR	`mx2.zohomail.com`
			PTR	`mx3.zohomail.com`
			PTR	`mx.zohomail.com`
TXT	`google-site-verification=4qVEg0p-WfgQwZcwYuKYBrxUAhv91FMmeCZ-_OsF3_8`
TXT	`keybase-site-verification=lx-pyzg_si5uXPItSUDXNXC1hBgL9k31LSeHQ70mtsc`
TXT	`v=spf1 include:zoho.com ~all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.67.229, 172.67.182.121
		IPv6 hints	2606:4700:3034::ac43:b679, 2606:4700:3035::6815:43e5
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=76, name=cloudflare-ech.com
SOA	`rita.ns.cloudflare.com`dns@cloudflare.com serial=2402563743

`app`

	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=101427

🔒 HSTS Preload (+subdomains)

Same first word

gradebook.org

gradebook.cz

gradebook.app

gradebook.net

gradebook.co

gradebook.com

Similar names

goodbrake.com

gerdabook.ru

bookgrade.com

DNS History

13 records (9 active, 4 former)

●NSrita.ns.cloudflare.com2020-01-20 → 2026-05-11 · 2 obs

● 2020-01-20 00:31:00
● 2026-05-11 00:30:44

●NSwalt.ns.cloudflare.com2020-01-20 → 2026-05-11 · 2 obs

● 2020-01-20 00:31:00
● 2026-05-11 00:30:44

●MXmx.zoho.com2020-01-20 → 2026-05-11 · 2 obs

● 2020-01-20 00:31:00
● 2026-05-11 00:30:44

●MXmx2.zoho.com2020-01-20 → 2026-05-11 · 2 obs

● 2020-01-20 00:31:00
● 2026-05-11 00:30:44

●MXmx3.zoho.com2020-01-20 → 2026-05-11 · 2 obs

● 2020-01-20 00:31:00
● 2026-05-11 00:30:44

●A104.21.67.2292026-02-25 → 2026-05-11 · 3 obs

○ 2020-01-20 00:31:00
● 2026-02-25 18:36:46
● 2026-05-11 00:30:44

○A104.24.120.1702020-01-20 → 2020-01-20 · 3 obs

● 2020-01-20 00:31:00
○ 2026-02-25 18:36:46
○ 2026-05-11 00:30:44

○A104.24.121.1702020-01-20 → 2020-01-20 · 3 obs

● 2020-01-20 00:31:00
○ 2026-02-25 18:36:46
○ 2026-05-11 00:30:44

●A172.67.182.1212026-02-25 → 2026-05-11 · 3 obs

○ 2020-01-20 00:31:00
● 2026-02-25 18:36:46
● 2026-05-11 00:30:44

○A2606:4700:3031::6818:78aa2020-01-20 → 2020-01-20 · 3 obs

● 2020-01-20 00:31:00
○ 2026-02-25 18:36:46
○ 2026-05-11 00:30:44

○A2606:4700:3031::6818:79aa2020-01-20 → 2020-01-20 · 3 obs

● 2020-01-20 00:31:00
○ 2026-02-25 18:36:46
○ 2026-05-11 00:30:44

●A2606:4700:3034::ac43:b6792026-02-25 → 2026-05-11 · 3 obs

○ 2020-01-20 00:31:00
● 2026-02-25 18:36:46
● 2026-05-11 00:30:44

●A2606:4700:3035::6815:43e52026-02-25 → 2026-05-11 · 3 obs

○ 2020-01-20 00:31:00
● 2026-02-25 18:36:46
● 2026-05-11 00:30:44

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
app	ns-tld1.charlestonroadregistry.com, ns-tld2.charlestonroadregistry.com, ns-tld3.charlestonroadregistry.com, ns-tld4.charlestonroadregistry.com...	-
gradebook.app	rita.ns.cloudflare.com, walt.ns.cloudflare.com	-

✅ Authoritative Response

Server:172.64.32.140

NS records: rita.ns.cloudflare.com, walt.ns.cloudflare.com

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 775ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.182.121, 104.21.67.229`
AAAA	2	`2606:4700:3034::ac43:b679, 2606:4700:3035::6815:43e5`
NS	2	`rita.ns.cloudflare.com, walt.ns.cloudflare.com`
MX	3	`mx.zoho.com (pri: 10), mx2.zoho.com (pri: 20)...`
TXT	3	`google-site-verification=4qVEg0p-WfgQwZc, keybase-site-verification=lx-pyzg_si5uXP...`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`rita.ns.cloudflare.com dns.cloudflare.co`

Analysis

IP Addresses

gradebook.app points to four IP numbers: 2606:4700:3034::ac43:b679, 2606:4700:3035::6815:43e5, 104.21.67.229 and 172.67.182.121.

Other host names, for instance apexfund24.click, yalomedia.com, dandenong.com.au, www.cristalwhite.com and dlycdc.com share IP numbers with gradebook.app.

Name Servers

gradebook.app is delegated to two name servers: rita.ns.cloudflare.com and walt.ns.cloudflare.com.

gradebook.app uses the same name server setup as other domains, for instance demna.net, pammshouse.com, davien.vn, tuoitredonganh.vn and autodato.com.