mail.linuxinstruction.com - robtex.com

mail.linuxinstruction.com

DNSSEC⚠️ Not signed
A2606:4700:3035::6815:2113🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3035::ac43:9d99🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.33.19Cloudflare104.21.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.157.153🇺🇸 Cloudflare172.67.144.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4104.21.33.19, 172.67.157.153
IPv62606:4700:3035::6815:2113, 2606:4700:3035::ac43:9d99

linuxinstruction.com

DNSSEC⚠️ Not signed
A2606:4700:3035::6815:2113🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3035::ac43:9d99🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.33.19Cloudflare104.21.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.157.153🇺🇸 Cloudflare172.67.144.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSandronicus.ns.cloudflare.com ⭐
NScarioca.ns.cloudflare.com
MX_dc-mx.bd4e04f91788.linuxinstruction.com ⭐
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4104.21.33.19, 172.67.157.153
IPv62606:4700:3035::6815:2113, 2606:4700:3035::ac43:9d99
SOAandronicus.ns.cloudflare.comdns@cloudflare.com serial=2397177750

Previously MX for

linuxinstruction.com

Same first word

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DNS History

7 records (4 active, 3 former)

20162017201820192020202120222023202420252026A104.21.33.19172.67.157.1532606:4700:3035::6815:21132606:4700:3035::ac43:9d99208.110.66.17835.212.105.5952.2.245.98
●A104.21.33.192026-03-27 → 2026-03-28 · 3 obs
○ 2026-02-15 08:29:40
● 2026-03-27 04:02:48
● 2026-03-28 09:31:42
●A172.67.157.1532026-03-27 → 2026-03-28 · 3 obs
○ 2026-02-15 08:29:40
● 2026-03-27 04:02:48
● 2026-03-28 09:31:42
○A208.110.66.1782015-08-04 → 2015-11-22 · 4 obs
● 2015-08-04 03:39:04
● 2015-11-22 10:03:08
○ 2016-03-28 19:31:42
○ 2026-03-28 09:31:42
●A2606:4700:3035::6815:21132026-03-27 → 2026-03-28 · 3 obs
○ 2026-02-15 08:29:40
● 2026-03-27 04:02:48
● 2026-03-28 09:31:42
●A2606:4700:3035::ac43:9d992026-03-27 → 2026-03-28 · 3 obs
○ 2026-02-15 08:29:40
● 2026-03-27 04:02:48
● 2026-03-28 09:31:42
○A35.212.105.592026-02-14 → 2026-02-15 · 5 obs
○ 2016-09-22 17:11:08
● 2026-02-14 21:40:46
● 2026-02-15 08:29:40
○ 2026-03-27 04:02:48
○ 2026-03-28 09:31:42
○A52.2.245.982016-03-28 → 2016-09-22 · 5 obs
○ 2015-11-22 10:03:08
● 2016-03-28 19:31:42
● 2016-09-22 17:11:08
○ 2026-02-14 21:40:46
○ 2026-03-28 09:31:42

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coma.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...-
linuxinstruction.comcarioca.ns.cloudflare.com, andronicus.ns.cloudflare.com12 records

✅ Authoritative Response

Server:108.162.194.20

NS records: carioca.ns.cloudflare.com, andronicus.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for linuxinstruction.com (unsigned zone)

⏱️ Timing

Total: 112ms | Queries: -

📄 Records

TypeCountSample Data
A2104.21.33.19, 172.67.157.153
AAAA22606:4700:3035::6815:2113, 2606:4700:3035::ac43:9d99
HTTPS1{"priority":1,"target":".","alpn":["h3",

📌 Glue Records Collected

Total: 12

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

Analysis

IP Addresses

mail.linuxinstruction.com points to four IP numbers: 2606:4700:3035::6815:2113, 2606:4700:3035::ac43:9d99, 104.21.33.19 and 172.67.157.153.

Other host names, for instance xstxt.net, escala-z.com, berwickmestorage.com, www.nagalocal.com and ha-han.com.tw share IP numbers with mail.linuxinstruction.com.