`mail.courseblue.com`

DNSSEC	⚠️ Not signed
A	15.235.219.232^{🇸🇬 OVH15.235.128.0/17 Hosting route}
		PTR	`rs5-sgp.serverhostgroup.com`

`courseblue.com`

	DNSSEC	⚠️ Not signed
	A	108.61.200.94^{🇯🇵 AS-VULTR108.61.200.0/23 Vultr Assigned Prefix}
	NS	`jon.quicns.com` ⭐
	NS	`kevin.quicns.com`
	MX	`mail.courseblue.com` ⭐
	TXT	`v=spf1 +a +mx +ip4:15.235.219.232 include:relay.mailchannels.net ~all`
	SOA	`jon.quicns.com`dns@quicns.com serial=1758593204

WOT: SAFE (50/100)

MX for

courseblue.com

Same first word

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DNS History

1 record (1 active, 0 former)

●A15.235.219.2322026-02-15 → 2026-03-27 · 2 obs

● 2026-02-15 22:29:54
● 2026-03-27 17:08:22

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
courseblue.com	jon.quicns.com, kevin.quicns.com	2 records

✅ Authoritative Response

Server:64.66.241.1

NS records: jon.quicns.com, kevin.quicns.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for courseblue.com (unsigned zone)

⏱️ Timing

Total: 147ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`15.235.219.232`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (jon.quicns.com, kevin.quicns.com)

Analysis

Mail Server Role

mail.courseblue.com serves as the mail server for courseblue.com.

IP Addresses

mail.courseblue.com resolves to a single IP address: 15.235.219.232.

Other host names including aff.com.au, rs5-sgp.serverhostgroup.com, kchtm.com, rinna.in and dkratonwedding.com share IP numbers with mail.courseblue.com.

mail.courseblue.com - robtex.com