mail.courseos.com - robtex.com

mail.courseos.com

DNSSEC⚠️ Not signed
A172.234.24.211🇺🇸 AKAMAI-LINODE-AP172.234.16.0/20 Akamai Technologies
PTRk8s-svc-lander-namecheap-expired-02.us-ord.parklogic.net
A172.239.57.117🇺🇸 AKAMAI-LINODE-AP172.239.32.0/19 Akamai Technologies
NSdns101.registrar-servers.com ⭐ ⚠️ Not in parent delegation
A2600:3c02::f03c:93ff:febe:d723🇺🇸 AKAMAI-LINODE-AP2600:3c02::/32 Akamai Technologies
A170.187.200.230🇺🇸 AKAMAI-LINODE-AP170.187.200.0/21 Akamai Technologies
PTRlatte.parklogic.com
NSdns102.registrar-servers.com ⚠️ Not in parent delegation
A2600:3c02::f03c:93ff:febe:c249🇺🇸 AKAMAI-LINODE-AP2600:3c02::/32 Akamai Technologies
A23.239.17.221🇺🇸 AKAMAI-LINODE-AP23.239.16.0/22 Akamai Technologies
PTRmerlot.parklogic.com
MXmx.plingest.com ⭐
A38.143.66.193🇺🇸 AS6302338.143.66.0/24 Proxy-registered route object 2011686
PTR193-66-143-38.clients.gthost.com
TXTv=spf1 -all
SOAdns101.registrar-servers.comhostmaster@parklogic.com 2021-05-19 #1

courseos.com

DNSSEC⚠️ Not signed
A172.234.24.211🇺🇸 AKAMAI-LINODE-AP172.234.16.0/20 Akamai Technologies
A172.239.57.117🇺🇸 AKAMAI-LINODE-AP172.239.32.0/19 Akamai Technologies
NSdns101.registrar-servers.com ⭐
NSdns102.registrar-servers.com
MXmx.plingest.com ⭐
TXTv=spf1 -all
SOAdns101.registrar-servers.comhostmaster@parklogic.com 2021-05-19 #1

Previously MX for

courseos.com

Same first word

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DNS History

6 records (5 active, 1 former)

NSdns101.registrar-servers.comdns102.registrar-servers.comMXmx.plingest.comA172.234.24.211172.239.57.117198.54.125.205
●NSdns101.registrar-servers.com2026-02-24 → 2026-03-23 · 2 obs
● 2026-02-24 23:29:16
● 2026-03-23 20:37:44
●NSdns102.registrar-servers.com2026-02-24 → 2026-03-23 · 2 obs
● 2026-02-24 23:29:16
● 2026-03-23 20:37:44
●MXmx.plingest.com2026-02-24 → 2026-03-23 · 2 obs
● 2026-02-24 23:29:16
● 2026-03-23 20:37:44
●A172.234.24.2112026-02-24 → 2026-03-23 · 3 obs
○ 2026-02-20 13:51:36
● 2026-02-24 23:29:16
● 2026-03-23 20:37:44
●A172.239.57.1172026-02-24 → 2026-03-23 · 3 obs
○ 2026-02-20 13:51:36
● 2026-02-24 23:29:16
● 2026-03-23 20:37:44
○A198.54.125.2052026-02-20 → 2026-02-20 · 3 obs
● 2026-02-20 13:51:36
○ 2026-02-24 23:29:16
○ 2026-03-23 20:37:44

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coma.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...-
courseos.comdns101.registrar-servers.com, dns102.registrar-servers.com4 records

✅ Authoritative Response

Server:170.187.200.230

NS records: dns101.registrar-servers.com, dns102.registrar-servers.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for courseos.com (unsigned zone)

⏱️ Timing

Total: 392ms | Queries: -

📄 Records

TypeCountSample Data
A2172.234.24.211, 172.239.57.117
NS2dns102.registrar-servers.com, dns101.registrar-servers.com
MX1mx.plingest.com (pri: 10)
TXT1v=spf1 -all
SOA1dns101.registrar-servers.com hostmaster.

📌 Glue Records Collected

Total: 4

Out-of-bailiwick: 4 (dns101.registrar-servers.com, dns101.registrar-servers.com, dns102.registrar-servers.com...)

Analysis

IP Addresses

Two IP numbers are pointed to by mail.courseos.com: 172.234.24.211 and 172.239.57.117.

other host names include defleppard.online, nstakecne.com, 9angka.com, diggerfoot.com and totalmarketcfds.org; they share IP numbers with mail.courseos.com.

Name Servers

Two name servers dns101.registrar-servers.com and dns102.registrar-servers.com handle the delegation for mail.courseos.com.

mail.courseos.com shares the same name server setup as other domains, for instance mail.useittest.com, mx.iqnetworx.net, www.a2zwebdesigns.com, qaz.hscai.site and mail.lagc.info.

Host names with two IP numbers:

dns101.registrar-servers.com points to 2600:3c02::f03c:93ff:febe:d723 and 170.187.200.230.

dns102.registrar-servers.com points to 2600:3c02::f03c:93ff:febe:c249 and 23.239.17.221.

Mail Servers

mail.courseos.com is handled by a single mail server, mx.plingest.com.

mail.courseos.com uses the same mail server setup as other domains, for instance build-kimberlyahn.havesome.info, e470807f71e0.workstudylife.com, mail.tiphot.com, yh.sdkjfz.com and tvrepairdenver.net.

The host name mx.plingest.com points to IP 38.143.66.193.