`opencourse.com`

DNSSEC	⚠️ Not signed
A	216.206.180.119^{🇺🇸 AS209216.206.0.0/15}
		PTR	`opencourse.com`
		PTR	`119.mx3west.email.active.com`
NS	`dns1.p02.nsone.net` ⭐
		A	2620:4d:4000:6259:7:2:0:1^{🇺🇸 NSONE2620:4d:4000::/48 2620:4D:4000::/48}
			PTR	`dns1.p02.nsone.net`
		A	198.51.44.2^{🇺🇸 NSONE198.51.44.0/24 198.51.44.0}
			PTR	`dns1.p02.nsone.net`
NS	`dns1.p01.nsone.net`
		A	2620:4d:4000:6259:7:1:0:1^{🇺🇸 NSONE2620:4d:4000::/48 2620:4D:4000::/48}
			PTR	`dns1.p01.nsone.net`
		A	198.51.44.1^{🇺🇸 NSONE198.51.44.0/24 198.51.44.0}
			PTR	`dns1.p01.nsone.net`
NS	`dns2.p01.nsone.net`
		A	2a00:edc0:6259:7:1::2^{🇺🇸 NSONE2a00:edc0:6259::/48 NS1-2}
			PTR	`dns2.p01.nsone.net`
		A	198.51.45.1^{🇺🇸 NSONE198.51.45.0/24 198.51.45.0}
			PTR	`dns2.p01.nsone.net`
NS	`dns3.p01.nsone.net`
		A	2620:4d:4000:6259:7:1:0:3^{🇺🇸 NSONE2620:4d:4000::/48 2620:4D:4000::/48}
			PTR	`dns3.p01.nsone.net`
		A	198.51.44.65^{🇺🇸 NSONE198.51.44.0/24 198.51.44.0}
			PTR	`dns3.p01.nsone.net`
NS	`dns4.p01.nsone.net`
		A	2a00:edc0:6259:7:1::4^{🇺🇸 NSONE2a00:edc0:6259::/48 NS1-2}
			PTR	`dns4.p01.nsone.net`
		A	198.51.45.65^{🇺🇸 NSONE198.51.45.0/24 198.51.45.0}
			PTR	`dns4.p01.nsone.net`
NS	`ns05.sportsdns.net`
		A	2607:f740:e64f::1^{🇺🇸 NETACTUATE2607:f740:e64f::/48 NetActuate, Inc}
		A	45.54.72.1^{🇺🇸 NETACTUATE45.54.72.0/24 NetActuate, Inc}
NS	`ns06.sportsdns.net`
		A	2607:f740:e64f:4::1^{🇺🇸 NETACTUATE2607:f740:e64f::/48 NetActuate, Inc}
			PTR	`ns06.sportsdns.com`
		A	45.54.72.65^{🇺🇸 NETACTUATE45.54.72.0/24 NetActuate, Inc}
			PTR	`ns06.sportsdns.com`
NS	`ns07.sportsdns.net`
		A	2607:f740:e64f:8::1^{🇺🇸 NETACTUATE2607:f740:e64f::/48 NetActuate, Inc}
			PTR	`ns07.sportsdns.com`
		A	45.54.72.129^{🇺🇸 NETACTUATE45.54.72.0/24 NetActuate, Inc}
NS	`ns08.sportsdns.net`
		A	2607:f740:e64f:c::1^{🇺🇸 NETACTUATE2607:f740:e64f::/48 NetActuate, Inc}
			PTR	`ns08.sportsdns.com`
		A	45.54.72.193^{🇺🇸 NETACTUATE45.54.72.0/24 NetActuate, Inc}
MX	`mxa-000e8b01.gslb.pphosted.com` ⭐
MX	`mxb-000e8b01.gslb.pphosted.com` ⭐
TXT	`v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com ~all`
SOA	`dns1.p02.nsone.net`hostmaster@nsone.net serial=1657769253

`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=1781310538

PTR for

119.180.206.216.in-addr.arpa

Subdomains

ns2.opencourse.com

ns1.opencourse.com

images.opencourse.com

Same first word

opencourse.co.uk

opencourse.it

opencourse.net

opencourse.fr

opencourse.com

opencourse.info

opencourse.kr

opencourse.co

opencourse.org

opencourse.ru

opencourse.de

Similar names

sourceopen.org

opensource.events

opensource.cc

opensource.house

opensource.guru

opensource.day

opensource.ac.cn

opensource.gr

superecono.com

opensource.capital

opensource.com.vn

opensource.de

opensource.net.my

coopeneurs.com

opensource.ch

opensource.aws

opensource.gr.jp

opensource.net

opensource.co.ke

opensource.ec

opensource.cool

opensource.center

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opensource.agency

opensource.es

opensource.jp

opensource.ro

opensource.google

opensource.sg

opensource.joburg

opensource.clothing

opensource.international

opensource.gov

opensource.ae

opensource.co.uk

opensource.com.br

opensource.ie

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econosuper.com.mx

opensource.it

sourceopen.com

superecono.ca

opensource.tn

opensource.zone

opensource.care

opensource.id

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opensource.pl

opensource.guide

opensource.co.jp

opensource.cafe

opensource.dk

opensource.ca

opensource.org.my

opensource.se

opensource.services

opensource.rs

opensource.org

opensource.expert

opensource.photography

neuroscope.net

neuroscope.org

opensource.at

opensource.bar

opensource.mobi

opensource.computer

opensource.business

opensource.azurefd.net

opensource.sa

opensource.systems

opensource.mt

opensource.fit

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neuroscope.ca

opensource.pt

opensource.my

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opensource.ms

opensource.money

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opensource.no

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DNS History

16 records (12 active, 4 former)

●NSdns1.p01.nsone.net2026-02-18 → 2026-06-13 · 3 obs

○ 2016-04-08 23:45:32
● 2026-02-18 15:18:48
● 2026-06-13 00:52:02

●NSdns1.p02.nsone.net2026-02-18 → 2026-06-13 · 3 obs

○ 2016-04-08 23:45:32
● 2026-02-18 15:18:48
● 2026-06-13 00:52:02

●NSdns2.p01.nsone.net2026-02-18 → 2026-06-13 · 3 obs

○ 2016-04-08 23:45:32
● 2026-02-18 15:18:48
● 2026-06-13 00:52:02

●NSdns3.p01.nsone.net2026-02-18 → 2026-06-13 · 3 obs

○ 2016-04-08 23:45:32
● 2026-02-18 15:18:48
● 2026-06-13 00:52:02

●NSdns4.p01.nsone.net2026-02-18 → 2026-06-13 · 3 obs

○ 2016-04-08 23:45:32
● 2026-02-18 15:18:48
● 2026-06-13 00:52:02

●NSns05.sportsdns.net2026-02-18 → 2026-06-13 · 3 obs

○ 2016-04-08 23:45:32
● 2026-02-18 15:18:48
● 2026-06-13 00:52:02

●NSns06.sportsdns.net2026-02-18 → 2026-06-13 · 3 obs

○ 2016-04-08 23:45:32
● 2026-02-18 15:18:48
● 2026-06-13 00:52:02

●NSns07.sportsdns.net2026-02-18 → 2026-06-13 · 3 obs

○ 2016-04-08 23:45:32
● 2026-02-18 15:18:48
● 2026-06-13 00:52:02

●NSns08.sportsdns.net2026-02-18 → 2026-06-13 · 3 obs

○ 2016-04-08 23:45:32
● 2026-02-18 15:18:48
● 2026-06-13 00:52:02

○NSns1.p13.dynect.net2015-05-06 → 2016-04-08 · 4 obs

● 2015-05-06 08:51:08
● 2016-04-08 23:45:32
○ 2026-02-18 15:18:48
○ 2026-06-13 00:52:02

○NSns2.p13.dynect.net2015-05-06 → 2016-04-08 · 4 obs

● 2015-05-06 08:51:08
● 2016-04-08 23:45:32
○ 2026-02-18 15:18:48
○ 2026-06-13 00:52:02

○NSns3.p13.dynect.net2015-05-06 → 2016-04-08 · 4 obs

● 2015-05-06 08:51:08
● 2016-04-08 23:45:32
○ 2026-02-18 15:18:48
○ 2026-06-13 00:52:02

○NSns4.p13.dynect.net2015-05-06 → 2016-04-08 · 4 obs

● 2015-05-06 08:51:08
● 2016-04-08 23:45:32
○ 2026-02-18 15:18:48
○ 2026-06-13 00:52:02

●MXmxa-000e8b01.gslb.pphosted.com2015-05-06 → 2026-06-13 · 2 obs

● 2015-05-06 08:51:08
● 2026-06-13 00:52:02

●MXmxb-000e8b01.gslb.pphosted.com2015-05-06 → 2026-06-13 · 2 obs

● 2015-05-06 08:51:08
● 2026-06-13 00:52:02

●A216.206.180.1192015-05-06 → 2026-06-13 · 2 obs

● 2015-05-06 08:51:08
● 2026-06-13 00:52:02

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	l.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net...	-
opencourse.com	dns1.p01.nsone.net, dns2.p01.nsone.net, dns3.p01.nsone.net, dns4.p01.nsone.net...	-

✅ Authoritative Response

Server:198.51.44.1

NS records: dns1.p01.nsone.net, dns2.p01.nsone.net, dns3.p01.nsone.net, dns4.p01.nsone.net, ns05.sportsdns.net, ns06.sportsdns.net, ns07.sportsdns.net, ns08.sportsdns.net

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for opencourse.com (unsigned zone)

⏱️ Timing

Total: 571ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`216.206.180.119`
NS	8	`dns1.p01.nsone.net, dns2.p01.nsone.net...`
MX	2	`mxa-000e8b01.gslb.pphosted.com (pri: 10), mxb-000e8b01.gslb.pphosted.com (pri: 10)`
TXT	1	`v=spf1 include:%{ir}.%{v}.%{d}.spf.has.p`
SOA	1	`dns1.p02.nsone.net hostmaster.nsone.net`

Analysis

Hierarchy

ns2.opencourse.com, ns1.opencourse.com and images.opencourse.com are all subdomains of opencourse.com.

IP Addresses

opencourse.com directs to one IP number, which is 216.206.180.119.

Name Servers

DNS for opencourse.com is handled by 9 name servers: ns05.sportsdns.net, ns06.sportsdns.net, ns07.sportsdns.net and 6 others.

The name servers of opencourse.com overlap at least partially with those of other domains — among them dj-outsider.com, dnbdm.fi, bitnye.com and two more.

These name servers commonly appear in delegations together with dns1.p01.nsone.net, dns2.p01.nsone.net, dns3.p01.nsone.net and 7 other.

Hosts with two IP numbers each:

ns05.sportsdns.net has two IP addresses: 45.54.72.1 and 2607:f740:e64f::1.

ns06.sportsdns.net has two IP addresses: 45.54.72.65 and 2607:f740:e64f:4::1.

ns07.sportsdns.net has two IP addresses: 45.54.72.129 and 2607:f740:e64f:8::1.

ns08.sportsdns.net has two IP addresses: 45.54.72.193 and 2607:f740:e64f:c::1.

dns1.p01.nsone.net has two IP addresses: 198.51.44.1 and 2620:4d:4000:6259:7:1:0:1.

dns2.p01.nsone.net has two IP addresses: 198.51.45.1 and 2a00:edc0:6259:7:1::2.

dns3.p01.nsone.net has two IP addresses: 198.51.44.65 and 2620:4d:4000:6259:7:1:0:3.

dns4.p01.nsone.net has two IP addresses: 198.51.45.65 and 2a00:edc0:6259:7:1::4.

dns1.p02.nsone.net has two IP addresses: 198.51.44.2 and 2620:4d:4000:6259:7:2:0:1.