`pdftextbooks.org`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::6815:41ad^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3037::ac43:a4f2^{🇺🇸 Cloudflare2606:4700:3037::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.65.173^{Cloudflare104.21.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.164.242^{🇺🇸 Cloudflare172.67.160.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`arya.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3a46^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`arya.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c046^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`arya.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2046^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`arya.ns.cloudflare.com`
		A	108.162.192.70^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`arya.ns.cloudflare.com`
		A	172.64.32.70^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`arya.ns.cloudflare.com`
		A	173.245.58.70^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`arya.ns.cloudflare.com`
NS	`rodney.ns.cloudflare.com`
		A	2606:4700:58::adf5:3be4^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`rodney.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c1e4^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`rodney.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:21e4^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`rodney.ns.cloudflare.com`
		A	108.162.193.228^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`rodney.ns.cloudflare.com`
		A	172.64.33.228^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`rodney.ns.cloudflare.com`
		A	173.245.59.228^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`rodney.ns.cloudflare.com`
MX	`route1.mx.cloudflare.net` ⭐
		A	2606:4700:f5::b^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	2606:4700:f5::c^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	2606:4700:f5::d^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.11^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.12^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.13^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
MX	`route2.mx.cloudflare.net`⁽²⁸⁾
		A	2606:4700:f5::e^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	2606:4700:f5::f^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	2606:4700:f5::10^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.17^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.18^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.19^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
MX	`route3.mx.cloudflare.net`⁽⁴⁰⁾
		A	2606:4700:f5::11^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	2606:4700:f5::12^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	2606:4700:f5::13^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.23^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.24^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.25^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
TXT	`brevo-code:c49b8d72be87d7edece596637bf2b001`
TXT	`google-site-verification=2HCbKIe0Ei5U7gDw2hbNa85a-zfAm3fqYrhSmKNgNOw`
TXT	`v=spf1 include:_spf.mx.cloudflare.net ~all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.65.173, 172.67.164.242
		IPv6 hints	2606:4700:3030::6815:41ad, 2606:4700:3037::ac43:a4f2
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=91, name=cloudflare-ech.com
SOA	`arya.ns.cloudflare.com`dns@cloudflare.com serial=2409577858

`org`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a0.org.afilias-nst.info` ⭐ ⚠️ Not in parent delegation
	NS	`a2.org.afilias-nst.info` ⚠️ Not in parent delegation
	NS	`b0.org.afilias-nst.org`
	NS	`b2.org.afilias-nst.org`
	NS	`c0.org.afilias-nst.info` ⚠️ Not in parent delegation
	NS	`d0.org.afilias-nst.org`
	SOA	`a0.org.afilias-nst.info`hostmaster@donuts.email serial=1784173286

Same first word

pdftextbooks.org

pdftextbooks.com

Similar names

textbookspdf.com

textbookpdfs.com

DNS History

15 records (9 active, 6 former)

●NSarya.ns.cloudflare.com2026-06-28 → 2026-07-16 · 3 obs

○ 2018-10-22 12:15:56
● 2026-06-28 20:09:36
● 2026-07-16 03:48:24

○NScns1.sedoparking.com2018-10-22 → 2018-10-22 · 3 obs

● 2018-10-22 12:15:56
○ 2026-06-28 20:09:36
○ 2026-07-16 03:48:24

○NScns2.sedoparking.com2018-10-22 → 2018-10-22 · 3 obs

● 2018-10-22 12:15:56
○ 2026-06-28 20:09:36
○ 2026-07-16 03:48:24

●NSrodney.ns.cloudflare.com2026-06-28 → 2026-07-16 · 3 obs

○ 2018-10-22 12:15:56
● 2026-06-28 20:09:36
● 2026-07-16 03:48:24

○MXmail.nickstel.com2018-10-22 → 2018-10-22 · 3 obs

● 2018-10-22 12:15:56
○ 2026-06-28 20:09:36
○ 2026-07-16 03:48:24

●MXroute1.mx.cloudflare.net2026-06-28 → 2026-07-16 · 3 obs

○ 2018-10-22 12:15:56
● 2026-06-28 20:09:36
● 2026-07-16 03:48:24

●MXroute2.mx.cloudflare.net2026-06-28 → 2026-07-16 · 3 obs

○ 2018-10-22 12:15:56
● 2026-06-28 20:09:36
● 2026-07-16 03:48:24

●MXroute3.mx.cloudflare.net2026-06-28 → 2026-07-16 · 3 obs

○ 2018-10-22 12:15:56
● 2026-06-28 20:09:36
● 2026-07-16 03:48:24

●A104.21.65.1732026-06-28 → 2026-07-16 · 3 obs

○ 2018-10-22 12:15:56
● 2026-06-28 20:09:36
● 2026-07-16 03:48:24

●A172.67.164.2422026-06-28 → 2026-07-16 · 3 obs

○ 2018-10-22 12:15:56
● 2026-06-28 20:09:36
● 2026-07-16 03:48:24

●A2606:4700:3030::6815:41ad2026-07-14 → 2026-07-16 · 3 obs

○ 2026-06-28 20:09:36
● 2026-07-14 15:50:46
● 2026-07-16 03:48:24

○A2606:4700:3033::ac43:a4f22026-06-28 → 2026-06-28 · 4 obs

○ 2018-10-22 12:15:56
● 2026-06-28 20:09:36
○ 2026-07-14 15:50:46
○ 2026-07-16 03:48:24

○A2606:4700:3035::6815:41ad2026-06-28 → 2026-06-28 · 4 obs

○ 2018-10-22 12:15:56
● 2026-06-28 20:09:36
○ 2026-07-14 15:50:46
○ 2026-07-16 03:48:24

●A2606:4700:3037::ac43:a4f22026-07-14 → 2026-07-16 · 3 obs

○ 2026-06-28 20:09:36
● 2026-07-14 15:50:46
● 2026-07-16 03:48:24

○A93.191.169.2102018-10-22 → 2018-10-22 · 3 obs

● 2018-10-22 12:15:56
○ 2026-06-28 20:09:36
○ 2026-07-16 03:48:24

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
org	b0.org.afilias-nst.org, b2.org.afilias-nst.org, d0.org.afilias-nst.org	-
pdftextbooks.org	rodney.ns.cloudflare.com, arya.ns.cloudflare.com	-

✅ Authoritative Response

Server:172.64.33.228

NS records: rodney.ns.cloudflare.com, arya.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for pdftextbooks.org (unsigned zone)

⏱️ Timing

Total: 1640ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.164.242, 104.21.65.173`
AAAA	2	`2606:4700:3037::ac43:a4f2, 2606:4700:3030::6815:41ad`
NS	2	`arya.ns.cloudflare.com, rodney.ns.cloudflare.com`
MX	3	`route1.mx.cloudflare.net (pri: 21), route2.mx.cloudflare.net (pri: 28)...`
TXT	3	`brevo-code:c49b8d72be87d7edece596637bf2b, google-site-verification=2HCbKIe0Ei5U7gD...`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`arya.ns.cloudflare.com dns.cloudflare.co`

Analysis

IP Addresses

pdftextbooks.org points to the four IP addresses 104.21.65.173, 172.67.164.242, 2606:4700:3030::6815:41ad and 2606:4700:3037::ac43:a4f2.

Additional host names — hpdirect.com.hk, www.tourscoil.click, hj260501c85.top and two others — share IP numbers with pdftextbooks.org.

Name Servers

pdftextbooks.org has two authoritative name servers — arya.ns.cloudflare.com and rodney.ns.cloudflare.com.

pdftextbooks.org shares its name server setup with other domains, including deodapolisnews.com.br, culturalcare.com.pe, henftricot.com.br and two others.

The name servers of pdftextbooks.org overlap at least partially with those of other domains — among them ministeringprintables.com, austo.cn, drpchiropractic.com and two more.

These name servers commonly appear alongside the name servers kinsley.ns.cloudflare.com and algin.ns.cloudflare.com.

Host names with 6 IP numbers:

arya.ns.cloudflare.com points to 108.162.192.70, 172.64.32.70, 173.245.58.70 and 3 other IP addresses.

rodney.ns.cloudflare.com points to 108.162.193.228, 172.64.33.228, 173.245.59.228 and 3 other IP addresses.

Mail Servers

Mail for pdftextbooks.org is routed through three mail servers — route1.mx.cloudflare.net, route2.mx.cloudflare.net and route3.mx.cloudflare.net.

pdftextbooks.org shares mail servers — at least in part — with other domains, including playtalkcentral.com, pierwon.com, panta.in and two others.

Host names with 6 IP numbers:

route1.mx.cloudflare.net points to 162.159.205.11, 162.159.205.12, 162.159.205.13 and 3 other IP addresses.

route2.mx.cloudflare.net points to 162.159.205.17, 162.159.205.18, 162.159.205.19 and 3 other IP addresses.

route3.mx.cloudflare.net points to 162.159.205.23, 162.159.205.24, 162.159.205.25 and 3 other IP addresses.

pdftextbooks.org - robtex.com