mail.knowapp.com - robtex.com

mail.knowapp.com

DNSSEC⚠️ Not signed
A2606:4700:3035::6815:1e43🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3036::ac43:ac37🇺🇸 Cloudflare2606:4700:3036::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.30.67Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.172.55🇺🇸 Cloudflare172.67.160.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
MXalt1.aspmx.l.google.com ⭐
A2607:f8b0:4003:c30::1b🇺🇸 Google2607:f8b0:4003::/48
PTRyutulis-in-f27.1e100.net
A74.125.27.26🇺🇸 Google74.125.27.0/24
PTRyutulis-in-f26.1e100.net
MXalt2.aspmx.l.google.com ⭐
A2607:f8b0:4001:c70::1a🇺🇸 Google2607:f8b0:4001::/48
PTRyucbful-in-f26.1e100.net
A192.178.209.26🇺🇸 Google192.178.209.0/24
PTRyucbful-in-f26.1e100.net
MXalt3.aspmx.l.google.com ⭐
A2607:f8b0:4024:c0d::1b🇺🇸 Google2607:f8b0::/32
PTRmj-in-f27.1e100.net
A192.178.152.26🇺🇸 Google192.178.152.0/24
PTRmj-in-f26.1e100.net
MXalt4.aspmx.l.google.com ⭐
A2607:f8b0:4023:403::1a🇺🇸 Google2607:f8b0::/32
PTRgg-in-f26.1e100.net
A142.250.96.27🇺🇸 Google142.250.96.0/24
PTRgg-in-f27.1e100.net
MXaspmx.l.google.com ⭐
A2607:f8b0:4004:c19::1b🇺🇸 Google2607:f8b0:4004::/48
PTRbk-in-f27.1e100.net
A172.253.62.27🇺🇸 Google172.253.62.0/24
PTRbc-in-f27.1e100.net
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4104.21.30.67, 172.67.172.55
IPv62606:4700:3035::6815:1e43, 2606:4700:3036::ac43:ac37

knowapp.com

DNSSEC⚠️ Not signed
A2606:4700:3035::6815:1e43🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3036::ac43:ac37🇺🇸 Cloudflare2606:4700:3036::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.30.67Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.172.55🇺🇸 Cloudflare172.67.160.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NScourtney.ns.cloudflare.com ⭐
NSrex.ns.cloudflare.com
MXalt1.aspmx.l.google.com ⭐
MXalt2.aspmx.l.google.com ⭐
MXalt3.aspmx.l.google.com ⭐
MXalt4.aspmx.l.google.com ⭐
MXaspmx.l.google.com ⭐
TXTgoogle-site-verification=1QEm7q00dgWUWEzSGH3w88pWPDJf8GRRzm8WDey8xX0
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4104.21.30.67, 172.67.172.55
IPv62606:4700:3035::6815:1e43, 2606:4700:3036::ac43:ac37
SOAcourtney.ns.cloudflare.comdns@cloudflare.com serial=2398497073

Previously MX for

knowapp.com

Same first word

mail.co.kr
mail.rv.ua
mail.ox.rs
mail.idv.tw
mail.pt
mail.ke
mail.net.sa
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mail.sc
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mail.company
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mail.health
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mail.com.kg
mail.nra
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mail.radio.fm
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mail.ms
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mail.tc
mail.gda.pl
mail.world
mail.pe
mail.sunnyday.jp
mail.group
mail.gov
mail.org.za
mail.mx
mail.cy
mail.supply

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DNS History

34 records (9 active, 25 former)

20162017201820192020202120222023202420252026MXalt1.aspmx.l.google.comalt2.aspmx.l.google.comalt3.aspmx.l.google.comalt4.aspmx.l.google.comaspmx.l.google.comA104.21.30.67172.67.172.552606:4700:3035::6815:1e432606:4700:3036::ac43:ac37172.64.80.1173.194.208.121173.194.67.121173.194.72.1212001:4860:400b:c01::79216.70.64.1002404:6800:4008:c01::792606:4700:130:436c:6f75:6466:6c61:72652607:f8b0:400c:c06::792607:f8b0:400d:c04::792607:f8b0:400d:c0a::792607:f8b0:400e:c02::792a00:1450:400b:c02::792a00:1450:400c:c05::792a00:1450:400c:c09::792a00:1450:400c:c0b::7964.233.166.12164.233.184.12174.125.129.12174.125.130.12174.125.141.12174.125.20.12174.125.24.121CNAMEghs.google.comghs.l.google.com
●MXalt1.aspmx.l.google.com2026-03-09 → 2026-03-09 · 1 obs
● 2026-03-09 04:55:34
●MXalt2.aspmx.l.google.com2026-03-09 → 2026-03-09 · 1 obs
● 2026-03-09 04:55:34
●MXalt3.aspmx.l.google.com2026-03-09 → 2026-03-09 · 1 obs
● 2026-03-09 04:55:34
●MXalt4.aspmx.l.google.com2026-03-09 → 2026-03-09 · 1 obs
● 2026-03-09 04:55:34
●MXaspmx.l.google.com2026-03-09 → 2026-03-09 · 1 obs
● 2026-03-09 04:55:34
●A104.21.30.672026-03-09 → 2026-03-09 · 2 obs
○ 2016-12-24 17:19:24
● 2026-03-09 04:55:34
○A172.64.80.12026-03-09 → 2026-03-09 · 1 obs
○ 2026-03-09 04:55:34
●A172.67.172.552026-03-09 → 2026-03-09 · 2 obs
○ 2016-12-24 17:19:24
● 2026-03-09 04:55:34
○A173.194.208.1212015-05-08 → 2015-05-08 · 2 obs
● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○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
○ 2026-03-09 04:55:34
○A173.194.72.1212015-05-08 → 2015-05-08 · 2 obs
● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○A2001:4860:400b:c01::792015-05-08 → 2015-05-08 · 2 obs
● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○A216.70.64.1002016-12-24 → 2016-12-24 · 3 obs
○ 2016-06-29 12:30:06
● 2016-12-24 17:19:24
○ 2026-03-09 04:55:34
○A2404:6800:4008:c01::792015-05-08 → 2015-05-08 · 2 obs
● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○A2606:4700:130:436c:6f75:6466:6c61:72652026-03-09 → 2026-03-09 · 1 obs
○ 2026-03-09 04:55:34
●A2606:4700:3035::6815:1e432026-03-09 → 2026-03-09 · 2 obs
○ 2016-12-24 17:19:24
● 2026-03-09 04:55:34
●A2606:4700:3036::ac43:ac372026-03-09 → 2026-03-09 · 2 obs
○ 2016-12-24 17:19:24
● 2026-03-09 04:55:34
○A2607:f8b0:400c:c06::792015-05-08 → 2015-05-08 · 2 obs
● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○A2607:f8b0:400d:c04::792015-05-08 → 2015-05-08 · 2 obs
● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○A2607:f8b0:400d:c0a::792015-05-08 → 2015-05-08 · 2 obs
● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○A2607:f8b0:400e:c02::792015-05-08 → 2015-05-08 · 2 obs
● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○A2a00:1450:400b:c02::792015-05-08 → 2015-05-08 · 2 obs
● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○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
○ 2026-03-09 04:55:34
○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
○ 2026-03-09 04:55:34
○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
○ 2026-03-09 04:55:34
○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
○ 2026-03-09 04:55:34
○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
○ 2026-03-09 04:55:34
○A74.125.129.1212015-05-08 → 2015-05-08 · 2 obs
● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○A74.125.130.1212015-05-08 → 2015-05-08 · 2 obs
● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○A74.125.141.1212015-05-08 → 2015-05-08 · 2 obs
● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○A74.125.20.1212015-05-08 → 2015-05-08 · 2 obs
● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○A74.125.24.1212015-05-08 → 2015-05-08 · 2 obs
● 2015-05-08 18:24:20
○ 2026-03-09 04:55:34
○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
○ 2026-03-09 04:55:34
○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
○ 2026-03-09 04:55:34

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coma.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...-
knowapp.comcourtney.ns.cloudflare.com, rex.ns.cloudflare.com12 records

✅ Authoritative Response

Server: 108.162.194.130

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: 242ms | Queries: -

📄 Records

TypeCountSample Data
A2172.67.172.55, 104.21.30.67
AAAA22606:4700:3036::ac43:ac37, 2606:4700:3035::6815:1e43
MX5ALT1.ASPMX.L.GOOGLE.com (pri: 0), ALT2.ASPMX.L.GOOGLE.com (pri: 0)...
HTTPS1{"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 resolves to four IP numbers: 2606:4700:3035::6815:1e43, 2606:4700:3036::ac43:ac37, 104.21.30.67 and 172.67.172.55.

other host names for instance mail.all4u.pl, alexandercossio.com, testbanklib.com, xhuaw.com.cn and www.fsfbcitas.co share IP numbers with mail.knowapp.com.

Mail Servers

mail.knowapp.com is handled by five mail servers: aspmx.l.google.com, alt1.aspmx.l.google.com, alt2.aspmx.l.google.com, alt3.aspmx.l.google.com and alt4.aspmx.l.google.com.

mail.knowapp.com shares mail servers with other domains at least partially, including wcircle.net, sidelar.com, ns500731.ns500731.ns500754.ns500704.ns500705.ns500671.ns500688.ns500291.ns500291.ns500291.ns500649.ns500153.tenderladiesbz.com, ns500758.ns500759.ns500759.ns500698.ns500735.ns500735.ns500698.ns500698.ns500735.ns500698.ns500576.ns500619.ns500576.ns500619.ns500619.trackreceptor.com and ns500768.ns500759.ns500698.ns500759.ns500758.ns500698.ns500698.ns500736.ns500698.ns500576.ns500686.ns500698.ns500619.ns500619.trackreceptor.com.

these mail servers are often used with the mail servers aspmx2.googlemail.com, aspmx3.googlemail.com, aspmx4.googlemail.com and aspmx5.googlemail.com.

Hosts with two IP numbers:

aspmx.l.google.com points to 2607:f8b0:4004:c19::1b and 172.253.62.27.

alt1.aspmx.l.google.com points to 2607:f8b0:4003:c30::1b and 74.125.27.26.

alt2.aspmx.l.google.com points to 2607:f8b0:4001:c70::1a and 192.178.209.26.

alt3.aspmx.l.google.com points to 2607:f8b0:4024:c0d::1b and 192.178.152.26.

alt4.aspmx.l.google.com points to 2607:f8b0:4023:403::1a and 142.250.96.27.