back.engineering - dns.ninja

`back.engineering`

DNSSEC	⚠️ Not signed
A	2606:4700:3037::6815:5219^{🇺🇸 Cloudflare2606:4700:3037::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3037::ac43:975d^{🇺🇸 Cloudflare2606:4700:3037::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.82.25^{Cloudflare104.21.80.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.151.93^{🇺🇸 Cloudflare172.67.144.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`memphis.ns.cloudflare.com` ⭐
		A	2606:4700:58::a29f:2cbd^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`memphis.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c3bd^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`memphis.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:23bd^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`memphis.ns.cloudflare.com`
		A	108.162.195.189^{🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`memphis.ns.cloudflare.com`
		A	162.159.44.189^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`memphis.ns.cloudflare.com`
		A	172.64.35.189^{🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`memphis.ns.cloudflare.com`
NS	`veronica.ns.cloudflare.com`
		A	2606:4700:50::a29f:26ad^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`veronica.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c2ad^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`veronica.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:22ad^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`veronica.ns.cloudflare.com`
		A	108.162.194.173^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`veronica.ns.cloudflare.com`
		A	162.159.38.173^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`veronica.ns.cloudflare.com`
		A	172.64.34.173^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`veronica.ns.cloudflare.com`
MX	`aspmx.l.google.com` ⭐
		A	2607:f8b0:4004:c17::1a^{🇺🇸 Google2607:f8b0:4004::/48}
			PTR	`bl-in-f26.1e100.net`
		A	192.178.218.27^{🇺🇸 Google192.178.218.0/24}
			PTR	`yuiadtq-in-f27.1e100.net`
MX	`alt2.aspmx.l.google.com`⁽⁵⁾
		A	2a00:1450:400b:c02::1a^{🇮🇪 Google2a00:1450:400b::/48}
			PTR	`dj-in-f26.1e100.net`
		A	172.253.116.27^{🇺🇸 Google172.253.116.0/24}
			PTR	`dj-in-f27.1e100.net`
MX	`alt4.aspmx.l.google.com`⁽¹⁰⁾
		A	2a00:1450:400c:c23::1a^{🇧🇪 Google2a00:1450:400c::/48}
			PTR	`yubrupd-in-f26.1e100.net`
		A	172.253.157.26^{🇺🇸 Google172.253.0.0/16}
			PTR	`yubrupd-in-f26.1e100.net`
TXT	`google-site-verification=QFVanmps5d2gA1j3C5EJtK5koNAzSKMXFJ4kWEhP__U`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.82.25, 172.67.151.93
		IPv6 hints	2606:4700:3037::6815:5219, 2606:4700:3037::ac43:975d
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=240, name=cloudflare-ech.com
SOA	`memphis.ns.cloudflare.com`dns@cloudflare.com serial=2409905824

`engineering`

	DNSSEC	🔒 Signed (DS record present)
	NS	`v0n0.nic.engineering` ⭐
	NS	`v0n1.nic.engineering`
	NS	`v0n2.nic.engineering`
	NS	`v0n3.nic.engineering`
	NS	`v2n0.nic.engineering`
	NS	`v2n1.nic.engineering`
	SOA	`v0n0.nic.engineering`hostmaster@donuts.email serial=1785261802

Same first word

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back.schule

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back.ly

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bakc.nl

ackb.com

kcab.be

cbak.de

cabk.com

kcab.se

ckba.co.kr

akcb.de

abck.org

cbka.fr

acbk.org

kbca.co.nz

DNS History

21 records (9 active, 12 former)

●NSmemphis.ns.cloudflare.com2026-02-21 → 2026-07-28 · 2 obs

● 2026-02-21 12:54:10
● 2026-07-28 18:08:52

●NSveronica.ns.cloudflare.com2026-02-21 → 2026-07-28 · 2 obs

● 2026-02-21 12:54:10
● 2026-07-28 18:08:52

●MXalt2.aspmx.l.google.com2026-02-21 → 2026-07-28 · 2 obs

● 2026-02-21 12:54:10
● 2026-07-28 18:08:52

●MXalt4.aspmx.l.google.com2026-02-21 → 2026-07-28 · 2 obs

● 2026-02-21 12:54:10
● 2026-07-28 18:08:52

●MXaspmx.l.google.com2026-02-21 → 2026-07-28 · 2 obs

● 2026-02-21 12:54:10
● 2026-07-28 18:08:52

●A104.21.82.252026-03-27 → 2026-07-28 · 11 obs

○ 2026-02-21 12:54:10
● 2026-03-27 16:24:06
○ 2026-03-31 04:28:14
● 2026-04-09 13:02:18
● 2026-04-29 00:03:32
○ 2026-05-01 13:14:42
● 2026-05-09 19:58:20
● 2026-06-07 19:34:42
○ 2026-06-15 07:02:06
● 2026-06-15 07:36:54
● 2026-07-28 18:08:52

○A172.64.80.12026-02-21 → 2026-07-28 · 2 obs

○ 2026-02-21 12:54:10
○ 2026-07-28 18:08:52

●A172.67.151.932026-03-27 → 2026-07-28 · 11 obs

○A188.114.96.02026-02-21 → 2026-05-01 · 8 obs

● 2026-02-21 12:54:10
○ 2026-03-27 16:24:06
● 2026-03-31 04:28:14
○ 2026-04-09 13:02:18
○ 2026-04-29 00:03:32
● 2026-05-01 13:14:42
○ 2026-05-09 19:58:20
○ 2026-07-28 18:08:52

○A188.114.96.42026-06-15 → 2026-06-15 · 4 obs

○ 2026-06-07 19:34:42
● 2026-06-15 07:02:06
○ 2026-06-15 07:36:54
○ 2026-07-28 18:08:52

○A188.114.97.02026-02-21 → 2026-05-01 · 8 obs

● 2026-02-21 12:54:10
○ 2026-03-27 16:24:06
● 2026-03-31 04:28:14
○ 2026-04-09 13:02:18
○ 2026-04-29 00:03:32
● 2026-05-01 13:14:42
○ 2026-05-09 19:58:20
○ 2026-07-28 18:08:52

○A188.114.97.42026-06-15 → 2026-06-15 · 4 obs

○ 2026-06-07 19:34:42
● 2026-06-15 07:02:06
○ 2026-06-15 07:36:54
○ 2026-07-28 18:08:52

○A2606:4700:130:436c:6f75:6466:6c61:72652026-02-21 → 2026-07-28 · 2 obs

○ 2026-02-21 12:54:10
○ 2026-07-28 18:08:52

○A2606:4700:3035::6815:52192026-03-27 → 2026-06-15 · 12 obs

○A2606:4700:3036::ac43:975d2026-03-27 → 2026-06-15 · 12 obs

●A2606:4700:3037::6815:52192026-07-02 → 2026-07-28 · 3 obs

○ 2026-06-15 07:36:54
● 2026-07-02 12:11:12
● 2026-07-28 18:08:52

●A2606:4700:3037::ac43:975d2026-07-02 → 2026-07-28 · 3 obs

○ 2026-06-15 07:36:54
● 2026-07-02 12:11:12
● 2026-07-28 18:08:52

○A2a06:98c1:3120::2026-02-21 → 2026-05-01 · 8 obs

● 2026-02-21 12:54:10
○ 2026-03-27 16:24:06
● 2026-03-31 04:28:14
○ 2026-04-09 13:02:18
○ 2026-04-29 00:03:32
● 2026-05-01 13:14:42
○ 2026-05-09 19:58:20
○ 2026-07-28 18:08:52

○A2a06:98c1:3120::42026-06-15 → 2026-06-15 · 4 obs

○ 2026-06-07 19:34:42
● 2026-06-15 07:02:06
○ 2026-06-15 07:36:54
○ 2026-07-28 18:08:52

○A2a06:98c1:3121::2026-02-21 → 2026-05-01 · 8 obs

● 2026-02-21 12:54:10
○ 2026-03-27 16:24:06
● 2026-03-31 04:28:14
○ 2026-04-09 13:02:18
○ 2026-04-29 00:03:32
● 2026-05-01 13:14:42
○ 2026-05-09 19:58:20
○ 2026-07-28 18:08:52

○A2a06:98c1:3121::42026-06-15 → 2026-06-15 · 4 obs

○ 2026-06-07 19:34:42
● 2026-06-15 07:02:06
○ 2026-06-15 07:36:54
○ 2026-07-28 18:08:52

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
engineering	v0n2.nic.engineering, v0n3.nic.engineering, v2n0.nic.engineering, v2n1.nic.engineering...	12 records
back.engineering	memphis.ns.cloudflare.com, veronica.ns.cloudflare.com	-

✅ Authoritative Response

Server:162.159.38.173

NS records: memphis.ns.cloudflare.com, veronica.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for back.engineering (unsigned zone)

⏱️ Timing

Total: 683ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.151.93, 104.21.82.25`
AAAA	2	`2606:4700:3037::6815:5219, 2606:4700:3037::ac43:975d`
NS	2	`memphis.ns.cloudflare.com, veronica.ns.cloudflare.com`
MX	3	`aspmx.l.google.com (pri: 1), alt4.aspmx.l.google.com (pri: 10)...`
TXT	1	`google-site-verification=QFVanmps5d2gA1j`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`memphis.ns.cloudflare.com dns.cloudflare`

📌 Glue Records Collected

Total: 12

In-bailiwick: 12 (v0n0.nic.engineering, v0n1.nic.engineering, v0n2.nic.engineering...)

Analysis

IP Addresses

back.engineering resolves to four IP addresses: 104.21.82.25, 172.67.151.93, 2606:4700:3037::6815:5219 and 2606:4700:3037::ac43:975d.

Additional host names — ufabet.cologne, deja.bg, www.pdmusic.org.cdn.cloudflare.net and two others — share IP numbers with back.engineering.

Name Servers

back.engineering is served by two delegated name servers, memphis.ns.cloudflare.com and veronica.ns.cloudflare.com.

back.engineering shares its name server setup with other domains, including freegoogleai.top, ambassen.dk, demoprise.com and two others.

back.engineering has at least partial name server overlap with other domains, such as smilestudio.com, musicgearcenter.com, softs32.com and two others.

These name servers tend to appear together with the name servers venus.ns.cloudflare.com, major.ns.cloudflare.com and jonah.ns.cloudflare.com.

Host names with 6 IP numbers:

memphis.ns.cloudflare.com carries IP addresses 108.162.195.189, 162.159.44.189 and 172.64.35.189, with 3 other addresses beyond those.

veronica.ns.cloudflare.com carries IP addresses 108.162.194.173, 162.159.38.173 and 172.64.34.173, with 3 other addresses beyond those.

Mail Servers

back.engineering has three mail servers: aspmx.l.google.com, alt2.aspmx.l.google.com and alt4.aspmx.l.google.com.

back.engineering shares mail servers — at least in part — with other domains, including finhydro.com, ns500731.ns500671.ns500754.ns500731.ns500688.ns500688.ns500688.ns500678.ns500666.ns500291.ns500291.ns500291.ns500131.lustychickser.com, port5.net and two others.

These mail servers are frequently paired with the mail servers alt1.aspmx.l.google.com, alt3.aspmx.l.google.com, aspmx2.googlemail.com and aspmx3.googlemail.com.

aspmx.l.google.com resolves to 192.178.218.27 and 2607:f8b0:4004:c17::1a. alt2.aspmx.l.google.com resolves to 172.253.116.27 and 2a00:1450:400b:c02::1a. alt4.aspmx.l.google.com resolves to 172.253.157.26 and 2a00:1450:400c:c23::1a. All three hostnames point to two IP numbers each.