nullmx.linuxcourse.com - robtex.com

nullmx.linuxcourse.com

DNSSEC⚠️ Not signed
A15.157.197.233🇨🇦 Amazon15.156.0.0/15 EC2 YUL prefix
PTRec2-15-157-197-233.ca-central-1.compute.amazonaws.com
A16.52.221.26🇺🇸 Amazon16.52.0.0/16 EC2 YUL prefix
NSip-172-26-1-146.us-east-2.compute.internal ⭐
NSns1.power-dns.com ⚠️ Not in parent delegation
A13.58.50.225🇺🇸 Amazon13.58.0.0/15 EC2 CMH prefix
PTRec2-13-58-50-225.us-east-2.compute.amazonaws.com
NSns2.power-dns.com ⚠️ Not in parent delegation
A188.166.142.159🇳🇱 DIGITALOCEAN188.166.140.0/22 DigitalOcean
NSns3.power-dns.com ⚠️ Not in parent delegation
A139.59.220.175🇸🇬 DIGITALOCEAN139.59.220.0/22 DigitalOcean
MXmx1.ewebdevelopment.com ⭐
A159.203.54.48🇨🇦 DIGITALOCEAN159.203.52.0/22 DigitalOcean
MXmx2.ewebdevelopment.com(5)
A188.166.142.73🇳🇱 DIGITALOCEAN188.166.140.0/22 DigitalOcean
TXTv=spf1 include:u2069692.wl.sendgrid.net -all
TXTafternic-verification-VKoxaZkQawZ8VVht35n43c
TXT934c3bfaa10e7d053ed251a82e3f4a82d19da885
TXT91f786e2661531d62a5e4bf8dc941c30c7391ed6
SOAip-172-26-1-146.us-east-2.compute.internalhostmaster@power-dns.com 2025-01-15 #1

linuxcourse.com

DNSSEC⚠️ Not signed
A15.157.197.233🇨🇦 Amazon15.156.0.0/15 EC2 YUL prefix
A16.52.221.26🇺🇸 Amazon16.52.0.0/16 EC2 YUL prefix
NSip-172-26-1-146.us-east-2.compute.internal ⭐
NSns1.power-dns.com
NSns2.power-dns.com
NSns3.power-dns.com
MXmx1.ewebdevelopment.com ⭐
MXmx2.ewebdevelopment.com(5)
TXT934c3bfaa10e7d053ed251a82e3f4a82d19da885
TXT91f786e2661531d62a5e4bf8dc941c30c7391ed6
TXTv=spf1 include:u2069692.wl.sendgrid.net -all
TXTafternic-verification-VKoxaZkQawZ8VVht35n43c
SOAip-172-26-1-146.us-east-2.compute.internalhostmaster@power-dns.com 2025-01-15 #1

Previously MX for

linuxcourse.com

Same first word

nullmx.org
nullmx.com
nullmx.net

Similar names

mlnxul.com

DNS History

26 records (8 active, 18 former)

200920112013201520172019202120232025NSip-172-26-1-146.us-east-2.compute.internalns1.power-dns.comns2.power-dns.comns3.power-dns.comamsterdam.power-dns.comsingapore.power-dns.comMXmx1.ewebdevelopment.commx2.ewebdevelopment.commail.dovemail.comA15.157.197.23316.52.221.2615.156.10.20415.157.161.15215.223.94.21216.52.102.9416.52.119.9816.52.206.10016.54.19.7416.54.9.119174.36.107.130174.37.172.162209.181.247.1053.96.19.03.97.47.1503.98.250.13799.79.11.127
○NSamsterdam.power-dns.com2026-05-07 → 2026-05-07 · 4 obs
○ 2026-04-24 03:10:12
● 2026-05-07 17:09:28
○ 2026-05-13 23:35:08
○ 2026-05-13 23:35:10
●NSip-172-26-1-146.us-east-2.compute.internal2026-02-19 → 2026-05-13 · 9 obs
○ 2016-06-28 22:41:04
● 2026-02-19 17:45:02
○ 2026-03-11 11:39:46
○ 2026-03-19 04:34:56
● 2026-04-04 08:27:38
● 2026-04-24 03:10:12
○ 2026-05-07 17:09:28
● 2026-05-13 23:35:08
● 2026-05-13 23:35:10
●NSns1.power-dns.com2015-07-16 → 2026-05-13 · 5 obs
○ 2008-03-20 10:58:40
● 2015-07-16 14:24:14
○ 2015-11-16 00:37:54
● 2016-06-28 22:41:04
● 2026-05-13 23:35:10
●NSns2.power-dns.com2015-07-16 → 2026-05-13 · 3 obs
○ 2008-03-20 10:58:40
● 2015-07-16 14:24:14
● 2026-05-13 23:35:10
●NSns3.power-dns.com2026-02-19 → 2026-05-13 · 3 obs
○ 2016-06-28 22:41:04
● 2026-02-19 17:45:02
● 2026-05-13 23:35:10
○NSsingapore.power-dns.com2026-03-11 → 2026-03-19 · 5 obs
○ 2026-02-19 17:45:02
● 2026-03-11 11:39:46
● 2026-03-19 04:34:56
○ 2026-04-04 08:27:38
○ 2026-05-13 23:35:10
○MXmail.dovemail.com2015-07-16 → 2016-06-28 · 5 obs
○ 2008-03-20 10:58:40
● 2015-07-16 14:24:14
● 2016-06-28 22:41:04
○ 2026-02-19 17:45:02
○ 2026-05-13 23:35:10
●MXmx1.ewebdevelopment.com2026-02-19 → 2026-05-13 · 3 obs
○ 2016-06-28 22:41:04
● 2026-02-19 17:45:02
● 2026-05-13 23:35:10
●MXmx2.ewebdevelopment.com2026-02-19 → 2026-05-13 · 3 obs
○ 2016-06-28 22:41:04
● 2026-02-19 17:45:02
● 2026-05-13 23:35:10
○A15.156.10.2042026-04-24 → 2026-04-24 · 4 obs
○ 2026-04-04 08:27:38
● 2026-04-24 03:10:12
○ 2026-05-07 17:09:28
○ 2026-05-13 23:35:10
○A15.157.161.1522026-03-11 → 2026-03-11 · 4 obs
○ 2026-02-19 17:45:02
● 2026-03-11 11:39:46
○ 2026-03-19 04:34:56
○ 2026-05-13 23:35:10
●A15.157.197.2332026-05-13 → 2026-05-13 · 3 obs
○ 2026-05-07 17:09:28
● 2026-05-13 23:35:08
● 2026-05-13 23:35:10
○A15.223.94.2122026-05-07 → 2026-05-07 · 4 obs
○ 2026-04-24 03:10:12
● 2026-05-07 17:09:28
○ 2026-05-13 23:35:08
○ 2026-05-13 23:35:10
○A16.52.102.942026-03-19 → 2026-03-19 · 4 obs
○ 2026-03-11 11:39:46
● 2026-03-19 04:34:56
○ 2026-04-04 08:27:38
○ 2026-05-13 23:35:10
○A16.52.119.982026-03-11 → 2026-03-11 · 4 obs
○ 2026-02-19 17:45:02
● 2026-03-11 11:39:46
○ 2026-03-19 04:34:56
○ 2026-05-13 23:35:10
○A16.52.206.1002026-03-19 → 2026-03-19 · 4 obs
○ 2026-03-11 11:39:46
● 2026-03-19 04:34:56
○ 2026-04-04 08:27:38
○ 2026-05-13 23:35:10
●A16.52.221.262026-05-13 → 2026-05-13 · 3 obs
○ 2026-05-07 17:09:28
● 2026-05-13 23:35:08
● 2026-05-13 23:35:10
○A16.54.19.742026-04-04 → 2026-04-04 · 4 obs
○ 2026-03-19 04:34:56
● 2026-04-04 08:27:38
○ 2026-04-24 03:10:12
○ 2026-05-13 23:35:10
○A16.54.9.1192026-04-04 → 2026-04-04 · 4 obs
○ 2026-03-19 04:34:56
● 2026-04-04 08:27:38
○ 2026-04-24 03:10:12
○ 2026-05-13 23:35:10
○A174.36.107.1302015-07-16 → 2015-07-16 · 4 obs
○ 2008-03-20 10:58:40
● 2015-07-16 14:24:14
○ 2026-02-19 17:45:02
○ 2026-05-13 23:35:10
○A174.37.172.1622015-07-16 → 2016-06-28 · 5 obs
○ 2008-03-20 10:58:40
● 2015-07-16 14:24:14
● 2016-06-28 22:41:04
○ 2026-02-19 17:45:02
○ 2026-05-13 23:35:10
○A209.181.247.1052008-03-20 → 2008-03-20 · 3 obs
● 2008-03-20 10:58:40
○ 2015-07-16 14:24:14
○ 2026-05-13 23:35:10
○A3.96.19.02026-05-07 → 2026-05-07 · 4 obs
○ 2026-04-24 03:10:12
● 2026-05-07 17:09:28
○ 2026-05-13 23:35:08
○ 2026-05-13 23:35:10
○A3.97.47.1502026-02-19 → 2026-02-19 · 4 obs
○ 2016-06-28 22:41:04
● 2026-02-19 17:45:02
○ 2026-03-11 11:39:46
○ 2026-05-13 23:35:10
○A3.98.250.1372026-02-19 → 2026-02-19 · 4 obs
○ 2016-06-28 22:41:04
● 2026-02-19 17:45:02
○ 2026-03-11 11:39:46
○ 2026-05-13 23:35:10
○A99.79.11.1272026-04-24 → 2026-04-24 · 4 obs
○ 2026-04-04 08:27:38
● 2026-04-24 03:10:12
○ 2026-05-07 17:09:28
○ 2026-05-13 23:35:10

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coml.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net...-
linuxcourse.comns1.power-dns.com, ns2.power-dns.com, ns3.power-dns.com3 records

✅ Authoritative Response

Server:139.59.220.175

NS records: ns1.power-dns.com, ns2.power-dns.com, ns3.power-dns.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for linuxcourse.com (unsigned zone)

⏱️ Timing

Total: 1115ms | Queries: -

📄 Records

TypeCountSample Data
A216.52.221.26, 15.157.197.233
NS3ns3.power-dns.com, ns2.power-dns.com...
MX2mx1.ewebdevelopment.com (pri: 1), mx2.ewebdevelopment.com (pri: 5)
TXT4v=spf1 include:u2069692.wl.sendgrid.net , 934c3bfaa10e7d053ed251a82e3f4a82d19da885...
SOA1singapore.power-dns.com hostmaster.power

📌 Glue Records Collected

Total: 3

Out-of-bailiwick: 3 (ns1.power-dns.com, ns2.power-dns.com, ns3.power-dns.com)

Analysis

IP Addresses

nullmx.linuxcourse.com points to two IPs: 15.157.197.233 and 16.52.221.26.

Other host names including h2ome.com, topultimate.com, network-space.com, plausch.com and fitnessscout.com share IP numbers with nullmx.linuxcourse.com.

Name Servers

nullmx.linuxcourse.com is delegated to four name servers: ns1.power-dns.com, ns2.power-dns.com, ns3.power-dns.com and ip-172-26-1-146.us-east-2.compute.internal.

nullmx.linuxcourse.com at least partially shares name servers with other domains, including cashingcard.com, secret-dreams.com, toolstuff.com, notarai.com and conteck.com.

These name servers are commonly used with singapore.power-dns.com and amsterdam.power-dns.com.

Hostnames with a single IP:

ns1.power-dns.com points to: 13.58.50.225.

ns2.power-dns.com points to: 188.166.142.159.

ns3.power-dns.com points to: 139.59.220.175.

Mail Servers

nullmx.linuxcourse.com is handled by two mail servers: mx1.ewebdevelopment.com and mx2.ewebdevelopment.com.

nullmx.linuxcourse.com shares its mail server setup with other domains, including naffen.com, noblecar.com, raiger.com, linuxtoolbox.com and globalachievers.com.

Host names with a single IP:

mx1.ewebdevelopment.com points to 159.203.54.48.

mx2.ewebdevelopment.com points to 188.166.142.73.