mail.knowapp.com - dns.ninja

`mail.knowapp.com`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::ac43:ac37^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3031::6815:1e43^{🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.30.67^{Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.172.55^{🇺🇸 Cloudflare172.67.160.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
MX	`alt1.aspmx.l.google.com` ⭐
		A	2800:3f0:4003:c0f::1a^{🇨🇱 Google2800:3f0:4003::/48}
		A	108.177.123.26^{🇺🇸 Google108.177.123.0/24}
			PTR	`lcscld-in-f26.1e100.net`
MX	`alt2.aspmx.l.google.com` ⭐
		A	2a00:1450:400b:c02::1b^{🇮🇪 Google2a00:1450:400b::/48}
			PTR	`dj-in-f27.1e100.net`
		A	172.253.116.27^{🇺🇸 Google172.253.116.0/24}
			PTR	`dj-in-f27.1e100.net`
MX	`alt3.aspmx.l.google.com` ⭐
		A	2a00:1450:4009:c0f::1b^{🇬🇧 Google2a00:1450:4009::/48}
			PTR	`yulhrs-in-f27.1e100.net`
		A	192.178.223.26^{🇺🇸 Google192.178.223.0/24}
			PTR	`yulhrs-in-f26.1e100.net`
MX	`alt4.aspmx.l.google.com` ⭐
		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`
MX	`aspmx.l.google.com` ⭐
		A	2607:f8b0:4004:c1f::1a^{🇺🇸 Google2607:f8b0:4004::/48}
			PTR	`pd-in-f26.1e100.net`
		A	172.253.63.27^{🇺🇸 Google172.253.63.0/24}
			PTR	`bi-in-f27.1e100.net`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.30.67, 172.67.172.55
		IPv6 hints	2606:4700:3030::ac43:ac37, 2606:4700:3031::6815:1e43
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=187, name=cloudflare-ech.com

`knowapp.com`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::ac43:ac37^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3031::6815:1e43^{🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.30.67^{Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.172.55^{🇺🇸 Cloudflare172.67.160.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`courtney.ns.cloudflare.com` ⭐
NS	`rex.ns.cloudflare.com`
MX	`alt1.aspmx.l.google.com` ⭐
MX	`alt2.aspmx.l.google.com` ⭐
MX	`alt3.aspmx.l.google.com` ⭐
MX	`alt4.aspmx.l.google.com` ⭐
MX	`aspmx.l.google.com` ⭐
TXT	`google-site-verification=1QEm7q00dgWUWEzSGH3w88pWPDJf8GRRzm8WDey8xX0`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.30.67, 172.67.172.55
		IPv6 hints	2606:4700:3030::ac43:ac37, 2606:4700:3031::6815:1e43
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=187, name=cloudflare-ech.com
SOA	`courtney.ns.cloudflare.com`dns@cloudflare.com serial=2408694264

Previously MX for

knowapp.com

Same first word

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DNS History

36 records (9 active, 27 former)

●MXalt1.aspmx.l.google.com2026-03-09 → 2026-08-07 · 2 obs

● 2026-03-09 04:55:34
● 2026-08-07 04:44:14

●MXalt2.aspmx.l.google.com2026-03-09 → 2026-08-07 · 2 obs

● 2026-03-09 04:55:34
● 2026-08-07 04:44:14

●MXalt3.aspmx.l.google.com2026-03-09 → 2026-08-07 · 2 obs

● 2026-03-09 04:55:34
● 2026-08-07 04:44:14

●MXalt4.aspmx.l.google.com2026-03-09 → 2026-08-07 · 2 obs

● 2026-03-09 04:55:34
● 2026-08-07 04:44:14

●MXaspmx.l.google.com2026-03-09 → 2026-08-07 · 2 obs

● 2026-03-09 04:55:34
● 2026-08-07 04:44:14

●A104.21.30.672026-03-09 → 2026-08-07 · 3 obs

○ 2016-12-24 17:19:24
● 2026-03-09 04:55:34
● 2026-08-07 04:44:14

○A172.64.80.12026-03-09 → 2026-08-07 · 2 obs

○ 2026-03-09 04:55:34
○ 2026-08-07 04:44:14

●A172.67.172.552026-03-09 → 2026-08-07 · 3 obs

○ 2016-12-24 17:19:24
● 2026-03-09 04:55:34
● 2026-08-07 04:44:14

○A173.194.208.1212015-05-08 → 2015-05-08 · 3 obs

● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○ 2026-08-07 04:44:14

○A173.194.67.1212015-11-10 → 2015-11-10 · 4 obs

○ 2015-05-08 18:24:20
● 2015-11-10 01:01:46
○ 2016-03-08 12:02:02
○ 2026-08-07 04:44:14

○A173.194.72.1212015-05-08 → 2015-05-08 · 3 obs

● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○ 2026-08-07 04:44:14

○A2001:4860:400b:c01::792015-05-08 → 2015-05-08 · 3 obs

● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○ 2026-08-07 04:44:14

○A216.70.64.1002016-12-24 → 2016-12-24 · 4 obs

○ 2016-06-29 12:30:06
● 2016-12-24 17:19:24
○ 2026-03-09 04:55:34
○ 2026-08-07 04:44:14

○A2404:6800:4008:c01::792015-05-08 → 2015-05-08 · 3 obs

● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○ 2026-08-07 04:44:14

○A2606:4700:130:436c:6f75:6466:6c61:72652026-03-09 → 2026-08-07 · 2 obs

○ 2026-03-09 04:55:34
○ 2026-08-07 04:44:14

●A2606:4700:3030::ac43:ac372026-07-04 → 2026-08-07 · 3 obs

○ 2026-06-10 23:00:08
● 2026-07-04 16:01:22
● 2026-08-07 04:44:14

●A2606:4700:3031::6815:1e432026-07-04 → 2026-08-07 · 3 obs

○ 2026-06-10 23:00:08
● 2026-07-04 16:01:22
● 2026-08-07 04:44:14

○A2606:4700:3035::6815:1e432026-03-09 → 2026-06-10 · 5 obs

○ 2016-12-24 17:19:24
● 2026-03-09 04:55:34
● 2026-06-10 23:00:08
○ 2026-07-04 16:01:22
○ 2026-08-07 04:44:14

○A2606:4700:3036::ac43:ac372026-03-09 → 2026-06-10 · 5 obs

○ 2016-12-24 17:19:24
● 2026-03-09 04:55:34
● 2026-06-10 23:00:08
○ 2026-07-04 16:01:22
○ 2026-08-07 04:44:14

○A2607:f8b0:400c:c06::792015-05-08 → 2015-05-08 · 3 obs

● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○ 2026-08-07 04:44:14

○A2607:f8b0:400d:c04::792015-05-08 → 2015-05-08 · 3 obs

● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○ 2026-08-07 04:44:14

○A2607:f8b0:400d:c0a::792015-05-08 → 2015-05-08 · 3 obs

● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○ 2026-08-07 04:44:14

○A2607:f8b0:400e:c02::792015-05-08 → 2015-05-08 · 3 obs

● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○ 2026-08-07 04:44:14

○A2a00:1450:400b:c02::792015-05-08 → 2015-05-08 · 3 obs

● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○ 2026-08-07 04:44:14

○A2a00:1450:400c:c05::792015-11-10 → 2015-11-10 · 4 obs

○ 2015-05-08 18:24:20
● 2015-11-10 01:01:46
○ 2016-03-08 12:02:02
○ 2026-08-07 04:44:14

○A2a00:1450:400c:c09::792016-03-08 → 2016-03-08 · 4 obs

○ 2015-11-10 01:01:46
● 2016-03-08 12:02:02
○ 2016-06-29 12:30:06
○ 2026-08-07 04:44:14

○A2a00:1450:400c:c0b::792016-06-29 → 2016-06-29 · 4 obs

○ 2016-03-08 12:02:02
● 2016-06-29 12:30:06
○ 2016-12-24 17:19:24
○ 2026-08-07 04:44:14

○A64.233.166.1212016-03-08 → 2016-03-08 · 4 obs

○ 2015-11-10 01:01:46
● 2016-03-08 12:02:02
○ 2016-06-29 12:30:06
○ 2026-08-07 04:44:14

○A64.233.184.1212016-06-29 → 2016-06-29 · 4 obs

○ 2016-03-08 12:02:02
● 2016-06-29 12:30:06
○ 2016-12-24 17:19:24
○ 2026-08-07 04:44:14

○A74.125.129.1212015-05-08 → 2015-05-08 · 3 obs

● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○ 2026-08-07 04:44:14

○A74.125.130.1212015-05-08 → 2015-05-08 · 3 obs

● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○ 2026-08-07 04:44:14

○A74.125.141.1212015-05-08 → 2015-05-08 · 3 obs

● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○ 2026-08-07 04:44:14

○A74.125.20.1212015-05-08 → 2015-05-08 · 3 obs

● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○ 2026-08-07 04:44:14

○A74.125.24.1212015-05-08 → 2015-05-08 · 3 obs

● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○ 2026-08-07 04:44:14

○CNAMEghs.google.com2015-05-08 → 2016-06-29 · 4 obs

● 2015-05-08 18:24:20
● 2016-06-29 12:30:06
○ 2016-12-24 17:19:24
○ 2026-08-07 04:44:14

○CNAMEghs.l.google.com2015-11-10 → 2016-06-29 · 5 obs

○ 2015-05-08 18:24:20
● 2015-11-10 01:01:46
● 2016-06-29 12:30:06
○ 2016-12-24 17:19:24
○ 2026-08-07 04:44:14

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
knowapp.com	courtney.ns.cloudflare.com, rex.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.195.13

NS records: courtney.ns.cloudflare.com, rex.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for knowapp.com (unsigned zone)

⏱️ Timing

Total: 191ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.172.55, 104.21.30.67`
AAAA	2	`2606:4700:3030::ac43:ac37, 2606:4700:3031::6815:1e43`
MX	5	`ALT1.ASPMX.L.GOOGLE.com (pri: 0), ALT2.ASPMX.L.GOOGLE.com (pri: 0)...`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`

📌 Glue Records Collected

Total: 12

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

Analysis

IP Addresses

mail.knowapp.com directs to four IP numbers, which are 104.21.30.67, 172.67.172.55, 2606:4700:3030::ac43:ac37 and 2606:4700:3031::6815:1e43.

Two other host names, along with mail.all4u.pl, alexandercossio.com and sektinfo.org, also share IP numbers with mail.knowapp.com.

Mail Servers

Five mail servers handle mail.knowapp.com: aspmx.l.google.com, alt1.aspmx.l.google.com, alt2.aspmx.l.google.com and two others.

There is at least a partial MX overlap between mail.knowapp.com and other domains, including wcircle.net, sidelar.com, ns500731.ns500731.ns500754.ns500704.ns500705.ns500671.ns500688.ns500291.ns500291.ns500291.ns500649.ns500153.tenderladiesbz.com and two others.

alt3.aspmx.l.google.com, alt4.aspmx.l.google.com, aspmx2.googlemail.com and aspmx3.googlemail.com are mail servers that frequently appear together with these mail servers.

Host names that have two IP addresses:

aspmx.l.google.com resolves to two addresses: 172.253.63.27 and 2607:f8b0:4004:c1f::1a.

alt1.aspmx.l.google.com resolves to two addresses: 108.177.123.26 and 2800:3f0:4003:c0f::1a.

alt2.aspmx.l.google.com resolves to two addresses: 172.253.116.27 and 2a00:1450:400b:c02::1b.

alt3.aspmx.l.google.com resolves to two addresses: 192.178.223.26 and 2a00:1450:4009:c0f::1b.

alt4.aspmx.l.google.com resolves to two addresses: 172.253.157.26 and 2a00:1450:400c:c23::1a.