🛡️Domain Reputation CheckBlocklist, phishing & malware status→

`engineeringnotes.org`

DNSSEC	⚠️ Not signed
A	2606:4700:3033::6815:4cc0^{🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3036::ac43:c774^{🇺🇸 Cloudflare2606:4700:3036::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.76.192^{Cloudflare104.21.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.199.116^{🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`asa.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3af6^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`asa.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c0f6^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`asa.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:20f6^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`asa.ns.cloudflare.com`
		A	108.162.192.246^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`asa.ns.cloudflare.com`
		A	172.64.32.246^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`asa.ns.cloudflare.com`
		A	173.245.58.246^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`asa.ns.cloudflare.com`
NS	`jeff.ns.cloudflare.com`
		A	2606:4700:58::adf5:3b7c^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jeff.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c17c^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`jeff.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:217c^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`jeff.ns.cloudflare.com`
		A	108.162.193.124^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jeff.ns.cloudflare.com`
		A	172.64.33.124^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jeff.ns.cloudflare.com`
		A	173.245.59.124^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jeff.ns.cloudflare.com`
MX	`mail.engineeringnotes.org` ⭐
		A	66.29.141.225^{🇺🇸 NAMCHEAP-PH66.29.141.0/24}
			PTR	`server313-3.web-hosting.com`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.76.192, 172.67.199.116
		IPv6 hints	2606:4700:3033::6815:4cc0, 2606:4700:3036::ac43:c774
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=178, name=cloudflare-ech.com
SOA	`asa.ns.cloudflare.com`dns@cloudflare.com serial=2411317920

`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=1788007013

Subdomains

mail.engineeringnotes.org

www.engineeringnotes.org

Same first word

engineeringnotes.org

Similar names

stoneengineering.com

stoneengineering.be

Previous names

Next names

DNS History

15 records (7 active, 8 former)

●NSasa.ns.cloudflare.com2016-12-25 → 2026-08-29 · 2 obs

● 2016-12-25 17:20:38
● 2026-08-29 12:53:04

●NSjeff.ns.cloudflare.com2016-12-25 → 2026-08-29 · 2 obs

● 2016-12-25 17:20:38
● 2026-08-29 12:53:04

●MXmail.engineeringnotes.org2016-12-25 → 2026-08-29 · 2 obs

● 2016-12-25 17:20:38
● 2026-08-29 12:53:04

●A104.21.76.1922026-08-24 → 2026-08-29 · 3 obs

○ 2018-08-21 17:07:34
● 2026-08-24 21:30:58
● 2026-08-29 12:53:04

○A104.27.148.1092018-08-21 → 2018-08-21 · 4 obs

○ 2016-12-25 17:20:38
● 2018-08-21 17:07:34
○ 2026-08-24 21:30:58
○ 2026-08-29 12:53:04

○A104.27.149.1092018-08-21 → 2018-08-21 · 4 obs

○ 2016-12-25 17:20:38
● 2018-08-21 17:07:34
○ 2026-08-24 21:30:58
○ 2026-08-29 12:53:04

○A104.28.0.1252016-12-25 → 2016-12-25 · 3 obs

● 2016-12-25 17:20:38
○ 2018-08-21 17:07:34
○ 2026-08-29 12:53:04

○A104.28.1.1252016-12-25 → 2016-12-25 · 3 obs

● 2016-12-25 17:20:38
○ 2018-08-21 17:07:34
○ 2026-08-29 12:53:04

●A172.67.199.1162026-08-24 → 2026-08-29 · 3 obs

○ 2018-08-21 17:07:34
● 2026-08-24 21:30:58
● 2026-08-29 12:53:04

○A2400:cb00:2048:1::681b:946d2018-08-21 → 2018-08-21 · 4 obs

○ 2016-12-25 17:20:38
● 2018-08-21 17:07:34
○ 2026-08-24 21:30:58
○ 2026-08-29 12:53:04

○A2400:cb00:2048:1::681b:956d2018-08-21 → 2018-08-21 · 4 obs

○ 2016-12-25 17:20:38
● 2018-08-21 17:07:34
○ 2026-08-24 21:30:58
○ 2026-08-29 12:53:04

○A2400:cb00:2048:1::681c:17d2016-12-25 → 2016-12-25 · 3 obs

● 2016-12-25 17:20:38
○ 2018-08-21 17:07:34
○ 2026-08-29 12:53:04

○A2400:cb00:2048:1::681c:7d2016-12-25 → 2016-12-25 · 3 obs

● 2016-12-25 17:20:38
○ 2018-08-21 17:07:34
○ 2026-08-29 12:53:04

●A2606:4700:3033::6815:4cc02026-08-24 → 2026-08-29 · 3 obs

○ 2018-08-21 17:07:34
● 2026-08-24 21:30:58
● 2026-08-29 12:53:04

●A2606:4700:3036::ac43:c7742026-08-24 → 2026-08-29 · 3 obs

○ 2018-08-21 17:07:34
● 2026-08-24 21:30:58
● 2026-08-29 12:53:04

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
org	d0.org.afilias-nst.org, b0.org.afilias-nst.org, b2.org.afilias-nst.org	-
engineeringnotes.org	asa.ns.cloudflare.com, jeff.ns.cloudflare.com	-

✅ Authoritative Response

Server:173.245.58.246

NS records: asa.ns.cloudflare.com, jeff.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for engineeringnotes.org (unsigned zone)

⏱️ Timing

Total: 691ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.199.116, 104.21.76.192`
AAAA	2	`2606:4700:3036::ac43:c774, 2606:4700:3033::6815:4cc0`
NS	2	`asa.ns.cloudflare.com, jeff.ns.cloudflare.com`
MX	1	`mail.engineeringnotes.org (pri: 0)`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`asa.ns.cloudflare.com dns.cloudflare.com`

Analysis

Hierarchy

The parent domain of mail.engineeringnotes.org and www.engineeringnotes.org is engineeringnotes.org.

IP Addresses

engineeringnotes.org has four IP addresses: 104.21.76.192, 172.67.199.116, 2606:4700:3033::6815:4cc0 and 2606:4700:3036::ac43:c774.

Among the host names that share IP numbers with engineeringnotes.org are glinmet.pl, ayunoxa.top, arrobbelut.cyou and two others.

Name Servers

engineeringnotes.org uses two name servers for its delegation: asa.ns.cloudflare.com and jeff.ns.cloudflare.com.

engineeringnotes.org has the same name server delegation as a number of other domains, such as chirotalk.com, bulldoglocks.com, whitelistads.com and two more.

engineeringnotes.org has at least partial name server overlap with other domains, such as omegatakilyfj.shop, techroll.gg, lauranhollmannb4a1v.pages.dev and two others.

It is common to find these name servers paired with the name servers kai.ns.cloudflare.com.

Host names resolving to 6 IP numbers:

Hostname asa.ns.cloudflare.com directs to 108.162.192.246, 172.64.32.246 and 173.245.58.246 along with 3 other IP addresses.

Hostname jeff.ns.cloudflare.com directs to 108.162.193.124, 172.64.33.124 and 173.245.59.124 along with 3 other IP addresses.

Mail Servers

engineeringnotes.org routes its mail through a single mail server, mail.engineeringnotes.org.

mail.engineeringnotes.org directs to just one IP number, 66.29.141.225.

engineeringnotes.org - robtex.com