`textbooks.dad`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::6815:5e9a^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3032::ac43:89c9^{🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.94.154^{Cloudflare104.21.80.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.137.201^{🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`chad.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3b52^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`chad.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c152^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`chad.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2152^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`chad.ns.cloudflare.com`
		A	108.162.193.82^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`chad.ns.cloudflare.com`
		A	172.64.33.82^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`chad.ns.cloudflare.com`
		A	173.245.59.82^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`chad.ns.cloudflare.com`
NS	`ivy.ns.cloudflare.com`
		A	2606:4700:50::adf5:3a78^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`ivy.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c078^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`ivy.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2078^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`ivy.ns.cloudflare.com`
		A	108.162.192.120^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`ivy.ns.cloudflare.com`
		A	172.64.32.120^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`ivy.ns.cloudflare.com`
		A	173.245.58.120^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`ivy.ns.cloudflare.com`
MX	`mx2.zoho.com` ⭐
		A	136.143.183.44^{🇺🇸 ZohoAS136.143.182.0/23 Zoho}
			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	`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	136.143.183.44^{🇺🇸 ZohoAS136.143.182.0/23 Zoho}
			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	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`
TXT	`ahrefs-site-verification_ff42bf92166e1844182fa1e9bd13fdcae3d581c73f13373c1713...`
TXT	`google-site-verification=HDXH9_9rWCT-sBT0tyfQ52zanxOEwW5isPjKSxI292Y`
TXT	`pinterest-site-verification=d5e760be93763e9ceba5189af35fd5ab`
TXT	`underestimate-6242f485-b707-45d3-bde7-16c678cab9a6`
TXT	`v=spf1 include:zohomail.com include:zoho.com ~all`
TXT	`zoho-verification=zb68452083.zmverify.zoho.com`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4	104.21.94.154, 172.67.137.201
		IPv6	2606:4700:3030::6815:5e9a, 2606:4700:3032::ac43:89c9
SOA	`chad.ns.cloudflare.com`dns@cloudflare.com serial=2398505604

`dad`

	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=1

🔒 HSTS Preload (+subdomains)

Same first word

textbooks.co

textbooks.org

textbooks.at

textbooks.com

textbooks.pro

textbooks.dad

textbooks.education

textbooks.com.ua

textbooks.net.ua

textbooks.com.cn

textbooks.de

textbooks.studio

textbooks.ca

textbooks.ir

textbooks.co.kr

textbooks.name

textbooks.direct

textbooks.co.uk

textbooks.net

textbooks.ltd

textbooks.info

DNS History

9 records (9 active, 0 former)

●NSchad.ns.cloudflare.com2026-03-03 → 2026-03-26 · 2 obs

● 2026-03-03 04:46:20
● 2026-03-26 09:14:10

●NSivy.ns.cloudflare.com2026-03-03 → 2026-03-26 · 2 obs

● 2026-03-03 04:46:20
● 2026-03-26 09:14:10

●MXmx.zoho.com2026-03-03 → 2026-03-26 · 2 obs

● 2026-03-03 04:46:20
● 2026-03-26 09:14:10

●MXmx2.zoho.com2026-03-03 → 2026-03-26 · 2 obs

● 2026-03-03 04:46:20
● 2026-03-26 09:14:10

●MXmx3.zoho.com2026-03-03 → 2026-03-26 · 2 obs

● 2026-03-03 04:46:20
● 2026-03-26 09:14:10

●A104.21.94.1542026-03-03 → 2026-03-26 · 2 obs

● 2026-03-03 04:46:20
● 2026-03-26 09:14:10

●A172.67.137.2012026-03-03 → 2026-03-26 · 2 obs

● 2026-03-03 04:46:20
● 2026-03-26 09:14:10

●A2606:4700:3030::6815:5e9a2026-03-03 → 2026-03-26 · 2 obs

● 2026-03-03 04:46:20
● 2026-03-26 09:14:10

●A2606:4700:3032::ac43:89c92026-03-03 → 2026-03-26 · 2 obs

● 2026-03-03 04:46:20
● 2026-03-26 09:14:10

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
dad	ns-tld4.charlestonroadregistry.com, ns-tld2.charlestonroadregistry.com, ns-tld1.charlestonroadregistry.com, ns-tld5.charlestonroadregistry.com...	10 records
textbooks.dad	chad.ns.cloudflare.com, ivy.ns.cloudflare.com	-

✅ Authoritative Response

Server:173.245.58.120

NS records: chad.ns.cloudflare.com, ivy.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for textbooks.dad (unsigned zone)

⏱️ Timing

Total: 453ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.137.201, 104.21.94.154`
AAAA	2	`2606:4700:3032::ac43:89c9, 2606:4700:3030::6815:5e9a`
NS	2	`chad.ns.cloudflare.com, ivy.ns.cloudflare.com`
MX	3	`mx.zoho.com (pri: 10), mx2.zoho.com (pri: 20)...`
TXT	6	`ahrefs-site-verification_ff42bf92166e184, google-site-verification=HDXH9_9rWCT-sBT...`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`chad.ns.cloudflare.com dns.cloudflare.co`

📌 Glue Records Collected

Total: 10

Out-of-bailiwick: 10 (ns-tld4.charlestonroadregistry.com, ns-tld4.charlestonroadregistry.com, ns-tld2.charlestonroadregistry.com...)

Analysis

IP Addresses

textbooks.dad maps to four IP numbers: 2606:4700:3030::6815:5e9a, 2606:4700:3032::ac43:89c9, 104.21.94.154 and 172.67.137.201.

other host names include atgastro.com, www.xhyxbjc.com, originroasting.com, shjinqi.com and brand028.com; they share IP numbers with textbooks.dad.

Name Servers

Two name servers chad.ns.cloudflare.com and ivy.ns.cloudflare.com handle the delegation for textbooks.dad.

textbooks.dad shares the same name server setup as other domains, for instance fokstatic.nl, (0x6f726761736d)sgif.com, craftico.in, mixaula.com and gistlover.com.

textbooks.dad at least partially shares name servers with other domains, for instance trailerpartskingdom.com, k(0x616e616c)sanierung.ch, dfdi.net, y0ev1.com and coocravea.ru.

These name servers are commonly used alongside lina.ns.cloudflare.com.

Six IP addresses per host:

chad.ns.cloudflare.com points to 2606:4700:58::adf5:3b52, 2803:f800:50::6ca2:c152, 2a06:98c1:50::ac40:2152, 108.162.193.82, 172.64.33.82 and 173.245.59.82; ivy.ns.cloudflare.com points to 2606:4700:50::adf5:3a78, 2803:f800:50::6ca2:c078, 2a06:98c1:50::ac40:2078, 108.162.192.120, 172.64.32.120 and 173.245.58.120

Mail Servers

Three mail servers handle textbooks.dad: mx2.zoho.com, mx3.zoho.com and mx.zoho.com.

textbooks.dad shares at least partially some mail servers with other domains, for instance aitacs.com, roselabel.com, gohighvoltage.com, itod.org and ashesoul.com.

Host names by IP count:

Two IP numbers: mx.zoho.com points to 136.143.183.44 and 136.143.191.44.

One IP number: mx2.zoho.com points to 136.143.183.44; mx3.zoho.com points to 136.143.191.44.

Host names that point to 136.143.183.44: mx.zoho.com and mx2.zoho.com.

Host names that point to 136.143.191.44: mx.zoho.com and mx3.zoho.com.

textbooks.dad - robtex.com

textbooks.dad

dad

Same first word

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

📌 Glue Records Collected

Analysis

IP Addresses

Name Servers

Mail Servers

`textbooks.dad`

`dad`