smtp.master-dns.com - robtex.com

smtp.master-dns.com

DNSSEC⚠️ Not signed
A2606:4700:3032::6815:46a5🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3034::ac43:89b5🇺🇸 Cloudflare2606:4700:3034::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.70.165Cloudflare104.21.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.137.181🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.70.165, 172.67.137.181
IPv6 hints2606:4700:3032::6815:46a5, 2606:4700:3034::ac43:89b5
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=28, name=cloudflare-ech.com

master-dns.com

DNSSEC⚠️ Not signed
A2606:4700:3032::6815:46a5🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3034::ac43:89b5🇺🇸 Cloudflare2606:4700:3034::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.70.165Cloudflare104.21.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.137.181🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSchan.ns.cloudflare.com ⭐
NSdylan.ns.cloudflare.com
MXsmtp.master-dns.com ⭐
TXTgoogle-site-verification=uWHPAgp33FcTTmEHHBeQcO1H36h_PwUNnxCWS5KiKIM
TXTv=spf1 +a +mx +ip4:163.182.170.162 +ip4:90.84.226.26 +ip4:173.233.68.249 ~all
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.70.165, 172.67.137.181
IPv6 hints2606:4700:3032::6815:46a5, 2606:4700:3034::ac43:89b5
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=28, name=cloudflare-ech.com
SOAchan.ns.cloudflare.comdns@cloudflare.com serial=2399853106

MX for

master-dns.com

Same first word

smtp.gc.ca
smtp.me
smtp.fi.it
smtp.rs.gov.br
smtp.gov.ru
smtp.business
smtp.ooo
smtp.jelastic.saveincloud.net
smtp.in
smtp.net.au
smtp.to.gov.br
smtp.com.br
smtp.fun
smtp.agency
smtp.pt
smtp.myshopify.com
smtp.ee
smtp.im
smtp.jelastic.dogado.eu
smtp.lat
smtp.cl
smtp.mk
smtp.lu
smtp.id
smtp.eu
smtp.fail
smtp.bz
smtp.ro
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smtp.lv
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smtp.store
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smtp.gov.ps
smtp.gouv.sn
smtp.gov.rs
smtp.eu.org
smtp.sc.gov.br
smtp.in-berlin.de
smtp.appengine.flow.ch
smtp.kinghost.net
smtp.org
smtp.es-1.axarnet.cloud
smtp.co.kr
smtp.(0x787878)
smtp.co.nz
smtp.kz
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smtp.jcloud.kz
smtp.sp.gov.br
smtp.net.ru
smtp.edu.ee
smtp.directory
smtp.j.layershift.co.uk
smtp.net.ua
smtp.hu
smtp.mail.pl
smtp.iki.fi
smtp.org.uk
smtp.at
smtp.com.au
smtp.tv
smtp.vg
smtp.ox.rs
smtp.co
smtp.su
smtp.net
smtp.dk
smtp.guru
smtp.io
smtp.cz
smtp.dedibox.fr
smtp.net.in
smtp.network
smtp.co.il
smtp.si
smtp.software
smtp.com.es
smtp.nhs.uk
smtp.ch
smtp.zone
smtp.pub
smtp.hosting
smtp.nu
smtp.tj
smtp.tools
smtp.com
smtp.com.mx
smtp.sk
smtp.co.hu
smtp.ws
smtp.uni5.net
smtp.jc.neen.it
smtp.vn
smtp.to
smtp.mircloud.host

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DNS History

8 records (4 active, 4 former)

A104.21.70.165172.67.137.1812606:4700:3032::6815:46a52606:4700:3034::ac43:89b5188.114.96.0188.114.97.02a06:98c1:3120::2a06:98c1:3121::
●A104.21.70.1652026-02-15 → 2026-04-13 · 9 obs
● 2026-02-15 23:16:00
● 2026-02-21 22:52:12
○ 2026-03-03 02:25:14
● 2026-03-26 22:56:00
○ 2026-03-26 23:43:12
● 2026-03-31 16:44:24
○ 2026-04-01 00:44:12
● 2026-04-03 15:37:16
● 2026-04-13 12:41:02
●A172.67.137.1812026-02-15 → 2026-04-13 · 9 obs
● 2026-02-15 23:16:00
● 2026-02-21 22:52:12
○ 2026-03-03 02:25:14
● 2026-03-26 22:56:00
○ 2026-03-26 23:43:12
● 2026-03-31 16:44:24
○ 2026-04-01 00:44:12
● 2026-04-03 15:37:16
● 2026-04-13 12:41:02
○A188.114.96.02026-03-03 → 2026-04-01 · 8 obs
○ 2026-02-21 22:52:12
● 2026-03-03 02:25:14
○ 2026-03-26 22:56:00
● 2026-03-26 23:43:12
○ 2026-03-31 16:44:24
● 2026-04-01 00:44:12
○ 2026-04-03 15:37:16
○ 2026-04-13 12:41:02
○A188.114.97.02026-03-03 → 2026-04-01 · 8 obs
○ 2026-02-21 22:52:12
● 2026-03-03 02:25:14
○ 2026-03-26 22:56:00
● 2026-03-26 23:43:12
○ 2026-03-31 16:44:24
● 2026-04-01 00:44:12
○ 2026-04-03 15:37:16
○ 2026-04-13 12:41:02
●A2606:4700:3032::6815:46a52026-02-15 → 2026-04-13 · 9 obs
● 2026-02-15 23:16:00
● 2026-02-21 22:52:12
○ 2026-03-03 02:25:14
● 2026-03-26 22:56:00
○ 2026-03-26 23:43:12
● 2026-03-31 16:44:24
○ 2026-04-01 00:44:12
● 2026-04-03 15:37:16
● 2026-04-13 12:41:02
●A2606:4700:3034::ac43:89b52026-02-15 → 2026-04-13 · 9 obs
● 2026-02-15 23:16:00
● 2026-02-21 22:52:12
○ 2026-03-03 02:25:14
● 2026-03-26 22:56:00
○ 2026-03-26 23:43:12
● 2026-03-31 16:44:24
○ 2026-04-01 00:44:12
● 2026-04-03 15:37:16
● 2026-04-13 12:41:02
○A2a06:98c1:3120::2026-03-03 → 2026-04-01 · 8 obs
○ 2026-02-21 22:52:12
● 2026-03-03 02:25:14
○ 2026-03-26 22:56:00
● 2026-03-26 23:43:12
○ 2026-03-31 16:44:24
● 2026-04-01 00:44:12
○ 2026-04-03 15:37:16
○ 2026-04-13 12:41:02
○A2a06:98c1:3121::2026-03-03 → 2026-04-01 · 8 obs
○ 2026-02-21 22:52:12
● 2026-03-03 02:25:14
○ 2026-03-26 22:56:00
● 2026-03-26 23:43:12
○ 2026-03-31 16:44:24
● 2026-04-01 00:44:12
○ 2026-04-03 15:37:16
○ 2026-04-13 12:41:02

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coml.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net...-
master-dns.comchan.ns.cloudflare.com, dylan.ns.cloudflare.com12 records

✅ Authoritative Response

Server:108.162.192.82

NS records: chan.ns.cloudflare.com, dylan.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for master-dns.com (unsigned zone)

⏱️ Timing

Total: 135ms | Queries: -

📄 Records

TypeCountSample Data
A2104.21.70.165, 172.67.137.181
AAAA22606:4700:3032::6815:46a5, 2606:4700:3034::ac43:89b5
HTTPS1{"priority":1,"target":".","alpn":["h3",

📌 Glue Records Collected

Total: 12

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

Analysis

Mail Server Role

smtp.master-dns.com serves as a mail server for master-dns.com.

IP Addresses

smtp.master-dns.com refers to four IP numbers: 2606:4700:3032::6815:46a5, 2606:4700:3034::ac43:89b5, 104.21.70.165 and 172.67.137.181.

Other host names, for instance topmasti.com, www.jcchtm.info, ro2.master-dns.com, addow.com and institutolibanopos.com.br share IP numbers with smtp.master-dns.com.