`fundamentalsof.com`

DNSSEC	⚠️ Not signed
A	2606:4700:3033::6815:1990^{🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3033::ac43:864e^{🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.25.144^{Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.134.78^{🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`dora.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3a6c^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`dora.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c06c^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`dora.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:206c^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`dora.ns.cloudflare.com`
		A	108.162.192.108^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`dora.ns.cloudflare.com`
		A	172.64.32.108^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`dora.ns.cloudflare.com`
		A	173.245.58.108^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`dora.ns.cloudflare.com`
NS	`ivan.ns.cloudflare.com`
		A	2606:4700:58::adf5:3b78^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`ivan.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c178^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`ivan.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2178^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`ivan.ns.cloudflare.com`
		A	108.162.193.120^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`ivan.ns.cloudflare.com`
		A	172.64.33.120^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`ivan.ns.cloudflare.com`
		A	173.245.59.120^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`ivan.ns.cloudflare.com`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.25.144, 172.67.134.78
		IPv6 hints	2606:4700:3033::6815:1990, 2606:4700:3033::ac43:864e
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=13, name=cloudflare-ech.com
SOA	`dora.ns.cloudflare.com`dns@cloudflare.com serial=2400335526

`com`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.gtld-servers.net` ⭐
	NS	`b.gtld-servers.net`
	NS	`c.gtld-servers.net`
	NS	`d.gtld-servers.net`
	NS	`e.gtld-servers.net`
	NS	`f.gtld-servers.net`
	NS	`g.gtld-servers.net`
	NS	`h.gtld-servers.net`
	NS	`i.gtld-servers.net`
	NS	`j.gtld-servers.net`
	NS	`k.gtld-servers.net`
	NS	`l.gtld-servers.net`
	NS	`m.gtld-servers.net`
	SOA	`a.gtld-servers.net`nstld@verisign-grs.com serial=1778531671

Same first word

fundamentalsof.com

DNS History

20 records (6 active, 14 former)

●NSdora.ns.cloudflare.com2026-03-03 → 2026-05-11 · 3 obs

○ 2015-07-02 20:42:46
● 2026-03-03 14:48:10
● 2026-05-11 20:58:04

●NSivan.ns.cloudflare.com2026-03-03 → 2026-05-11 · 3 obs

○ 2015-07-02 20:42:46
● 2026-03-03 14:48:10
● 2026-05-11 20:58:04

○NSyns1.yahoo.com2008-03-18 → 2008-03-18 · 3 obs

● 2008-03-18 01:39:52
○ 2015-07-02 20:42:46
○ 2026-05-11 20:58:04

○NSyns2.yahoo.com2008-03-18 → 2008-03-18 · 3 obs

● 2008-03-18 01:39:52
○ 2015-07-02 20:42:46
○ 2026-05-11 20:58:04

○MXmx1.biz.mail.yahoo.com2008-03-18 → 2008-03-18 · 3 obs

● 2008-03-18 01:39:52
○ 2015-07-02 20:42:46
○ 2026-05-11 20:58:04

○MXmx5.biz.mail.yahoo.com2008-03-18 → 2008-03-18 · 3 obs

● 2008-03-18 01:39:52
○ 2015-07-02 20:42:46
○ 2026-05-11 20:58:04

●A104.21.25.1442026-03-03 → 2026-05-11 · 6 obs

○ 2015-07-02 20:42:46
● 2026-03-03 14:48:10
● 2026-03-27 03:20:00
○ 2026-04-15 02:51:26
● 2026-04-15 07:40:42
● 2026-05-11 20:58:04

●A172.67.134.782026-03-03 → 2026-05-11 · 6 obs

○ 2015-07-02 20:42:46
● 2026-03-03 14:48:10
● 2026-03-27 03:20:00
○ 2026-04-15 02:51:26
● 2026-04-15 07:40:42
● 2026-05-11 20:58:04

○A188.114.96.02026-04-15 → 2026-04-15 · 4 obs

○ 2026-03-27 03:20:00
● 2026-04-15 02:51:26
○ 2026-04-15 07:40:42
○ 2026-05-11 20:58:04

○A188.114.97.02026-04-15 → 2026-04-15 · 4 obs

○ 2026-03-27 03:20:00
● 2026-04-15 02:51:26
○ 2026-04-15 07:40:42
○ 2026-05-11 20:58:04

○A216.39.62.1122008-03-18 → 2008-03-18 · 3 obs

● 2008-03-18 01:39:52
○ 2015-07-02 20:42:46
○ 2026-05-11 20:58:04

○A216.39.62.1132008-03-18 → 2008-03-18 · 3 obs

● 2008-03-18 01:39:52
○ 2015-07-02 20:42:46
○ 2026-05-11 20:58:04

○A216.39.62.1142008-03-18 → 2008-03-18 · 3 obs

● 2008-03-18 01:39:52
○ 2015-07-02 20:42:46
○ 2026-05-11 20:58:04

○A216.39.62.1152008-03-18 → 2008-03-18 · 3 obs

● 2008-03-18 01:39:52
○ 2015-07-02 20:42:46
○ 2026-05-11 20:58:04

○A216.39.62.1162008-03-18 → 2008-03-18 · 3 obs

● 2008-03-18 01:39:52
○ 2015-07-02 20:42:46
○ 2026-05-11 20:58:04

○A216.39.62.1172008-03-18 → 2008-03-18 · 3 obs

● 2008-03-18 01:39:52
○ 2015-07-02 20:42:46
○ 2026-05-11 20:58:04

●A2606:4700:3033::6815:19902026-03-03 → 2026-05-11 · 6 obs

○ 2015-07-02 20:42:46
● 2026-03-03 14:48:10
● 2026-03-27 03:20:00
○ 2026-04-15 02:51:26
● 2026-04-15 07:40:42
● 2026-05-11 20:58:04

●A2606:4700:3033::ac43:864e2026-03-03 → 2026-05-11 · 6 obs

○ 2015-07-02 20:42:46
● 2026-03-03 14:48:10
● 2026-03-27 03:20:00
○ 2026-04-15 02:51:26
● 2026-04-15 07:40:42
● 2026-05-11 20:58:04

○A2a06:98c1:3120::2026-04-15 → 2026-04-15 · 4 obs

○ 2026-03-27 03:20:00
● 2026-04-15 02:51:26
○ 2026-04-15 07:40:42
○ 2026-05-11 20:58:04

○A2a06:98c1:3121::2026-04-15 → 2026-04-15 · 4 obs

○ 2026-03-27 03:20:00
● 2026-04-15 02:51:26
○ 2026-04-15 07:40:42
○ 2026-05-11 20:58:04

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
fundamentalsof.com	dora.ns.cloudflare.com, ivan.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.193.120

NS records: dora.ns.cloudflare.com, ivan.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for fundamentalsof.com (unsigned zone)

⏱️ Timing

Total: 378ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.25.144, 172.67.134.78`
AAAA	2	`2606:4700:3033::6815:1990, 2606:4700:3033::ac43:864e`
NS	2	`dora.ns.cloudflare.com, ivan.ns.cloudflare.com`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`dora.ns.cloudflare.com dns.cloudflare.co`

📌 Glue Records Collected

Total: 12

Out-of-bailiwick: 12 (dora.ns.cloudflare.com, dora.ns.cloudflare.com, dora.ns.cloudflare.com...)

Analysis

IP Addresses

fundamentalsof.com points to four IP numbers: 2606:4700:3033::6815:1990, 2606:4700:3033::ac43:864e, 104.21.25.144 and 172.67.134.78.

Other host names including convince.me, odin.houstondad.com, unifiedit.nl, www.thefontdetective.com and hdc.net share IP numbers with fundamentalsof.com.

Name Servers

fundamentalsof.com's delegation uses two name servers, dora.ns.cloudflare.com and ivan.ns.cloudflare.com.

fundamentalsof.com shares the same name server setup as other domains, for example journalofmicroscopy.org.uk, motherofallbooks.com, blackwellurology.com, maplestory.network and optimalperformance.com.

fundamentalsof.com at least partially shares name servers with other domains, including com-hkky.com, brooklyn-harvest.pbis-cf.instacart.com, asc-toner.ch, bazapgn.pl and jc.se.

These name servers are often used together with major.ns.cloudflare.com.

Host names with six IP numbers:

dora.ns.cloudflare.com points to: 2606:4700:50::adf5:3a6c, 2803:f800:50::6ca2:c06c, 2a06:98c1:50::ac40:206c, 108.162.192.108, 172.64.32.108 and 173.245.58.108.

ivan.ns.cloudflare.com points to: 2606:4700:58::adf5:3b78, 2803:f800:50::6ca2:c178, 2a06:98c1:50::ac40:2178, 108.162.193.120, 172.64.33.120 and 173.245.59.120.

fundamentalsof.com - robtex.com