`course-u-can.com`

DNSSEC	⚠️ Not signed
A	104.238.170.139^{🇬🇧 AS-VULTR104.238.168.0/21 Vultr Assigned Prefix}
		PTR	`104.238.170.139.vultrusercontent.com`
NS	`ultra103.uk2.net` ⭐
		A	213.155.0.224
			PTR	`dns2.uk.chimera.uk2group.com`
NS	`ultra104.uk2.net`
		A	213.155.0.226
			PTR	`dns3.uk.chimera.uk2group.com`
MX	`courseucan-com01eb.mail.protection.outlook.com` ⭐
		A	2a01:111:f403:ca04::4^{🇮🇪 Microsoft2a01:111:f000::/36}
			PTR	`mail-db4pr02cu00204.inbound.protection.outlook.com`
		A	2a01:111:f403:ca04::d^{🇮🇪 Microsoft2a01:111:f000::/36}
			PTR	`mail-db6pr03cu00105.inbound.protection.outlook.com`
		A	2a01:111:f403:ca09::^{🇳🇱 Microsoft2a01:111:f000::/36}
			PTR	`mail-am3pr04cu00500.inbound.protection.outlook.com`
		A	2a01:111:f403:ca09::5^{🇳🇱 Microsoft2a01:111:f000::/36}
			PTR	`mail-am1pr04cu00105.inbound.protection.outlook.com`
		A	52.101.73.4^{🇳🇱 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-am0pr83cu00404.inbound.protection.outlook.com`
		A	52.101.73.22^{🇳🇱 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-am7pr05cu00106.inbound.protection.outlook.com`
		A	52.101.73.24^{🇳🇱 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-as8pr05cu00300.inbound.protection.outlook.com`
		A	52.101.73.30^{🇳🇱 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-am7pr05cu00306.inbound.protection.outlook.com`
TXT	`v=spf1 mx a include:spf.protection.outlook.com ip4:89.197.128.66 -all`
TXT	`csvum96dhskag4l(0x37317473)iluc0hp`
TXT	`v=spf1 include:_spf.hostedemail.com ~all`
TXT	`MS=ms69215980`
SOA	`ultra103.uk2.net`hostmaster@course-u-can@com 2013-08-07 #17

`com`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.gtld-servers.net` ⭐
	NS	`b.gtld-servers.net`
	NS	`c.gtld-servers.net`
	NS	`d.gtld-servers.net`
	NS	`e.gtld-servers.net`
	NS	`f.gtld-servers.net`
	NS	`g.gtld-servers.net`
	NS	`h.gtld-servers.net`
	NS	`i.gtld-servers.net`
	NS	`j.gtld-servers.net`
	NS	`k.gtld-servers.net`
	NS	`l.gtld-servers.net`
	NS	`m.gtld-servers.net`
	SOA	`a.gtld-servers.net`nstld@verisign-grs.com serial=1784061562

Subdomains

smtp1.course-u-can.com

Same first word

course-u-can.com

DNS History

6 records (4 active, 2 former)

●NSultra103.uk2.net2015-07-19 → 2026-07-14 · 2 obs

● 2015-07-19 13:34:48
● 2026-07-14 21:06:16

●NSultra104.uk2.net2015-07-19 → 2026-07-14 · 2 obs

● 2015-07-19 13:34:48
● 2026-07-14 21:06:16

●MXcourseucan-com01eb.mail.protection.outlook.com2019-12-25 → 2026-07-14 · 3 obs

○ 2016-12-23 00:48:24
● 2019-12-25 09:18:32
● 2026-07-14 21:06:16

○MXsmtp1.course-u-can.com2015-07-19 → 2016-12-23 · 4 obs

● 2015-07-19 13:34:48
● 2016-12-23 00:48:24
○ 2019-12-25 09:18:32
○ 2026-07-14 21:06:16

●A104.238.170.1392019-12-25 → 2026-07-14 · 3 obs

○ 2016-12-23 00:48:24
● 2019-12-25 09:18:32
● 2026-07-14 21:06:16

○A83.136.124.452015-07-19 → 2016-12-23 · 4 obs

● 2015-07-19 13:34:48
● 2016-12-23 00:48:24
○ 2019-12-25 09:18:32
○ 2026-07-14 21:06:16

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	d.gtld-servers.net, e.gtld-servers.net, k.gtld-servers.net, i.gtld-servers.net...	-
course-u-can.com	ultra103.uk2.net, ultra104.uk2.net	-

✅ Authoritative Response

Server:213.155.0.226

NS records: ultra103.uk2.net, ultra104.uk2.net

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for course-u-can.com (unsigned zone)

⏱️ Timing

Total: 357ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`104.238.170.139`
NS	2	`ultra104.uk2.net, ultra103.uk2.net`
MX	1	`courseucan-com01eb.mail.protection.outlo`
TXT	4	`MS=ms69215980, v=spf1 mx a include:spf.protection.outlo...`
SOA	1	`ultra103.uk2.net hostmaster@course-u-can`

Analysis

Hierarchy

smtp1.course-u-can.com is a subdomain of course-u-can.com.

IP Addresses

course-u-can.com points to a single IP number: 104.238.170.139.

There are other host names — intecc9.intecc.co.uk among them — that share IP numbers with course-u-can.com.

Name Servers

DNS delegation for course-u-can.com points to two name servers: ultra103.uk2.net and ultra104.uk2.net.

course-u-can.com shares its name server setup with other domains, including clearriver.cheap, bobc.co.uk, car-electronics.net and two others.

The name servers of course-u-can.com overlap at least partially with those of other domains — among them theshoulderunit.org, ty-canol.org.uk, otcdirect.co.uk and two more.

These name servers commonly co-occur with the name servers dns1.uk2.net, dns2.uk2.net, dns3.uk2.net and uk2net.com.

Both ultra103.uk2.net and ultra104.uk2.net have a single IP address each — ultra103.uk2.net resolves to 213.155.0.224 while ultra104.uk2.net resolves to 213.155.0.226.

Mail Servers

course-u-can.com has one mail server: courseucan-com01eb.mail.protection.outlook.com.

courseucan-com01eb.mail.protection.outlook.com points to 8 IP numbers: 52.101.73.4, 52.101.73.22, 52.101.73.24 and 5 other.

course-u-can.com - robtex.com

course-u-can.com

com