opencourse.com - dns.ninja

`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}
			PTR	`ns05.sportsdns.com`
		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}
		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}
		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=1783937682

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

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sourceopen.org

opensource.events

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opensource.house

opensource.guru

opensource.day

opensource.ac.cn

opensource.gr

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opensource.capital

opensource.com.vn

opensource.de

opensource.net.my

coopeneurs.com

opensource.ch

opensource.aws

opensource.gr.jp

opensource.net

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opensource.clothing

opensource.international

opensource.gov

opensource.ae

opensource.co.uk

opensource.com.br

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sourceopen.com

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opensource.tn

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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

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DNS History

16 records (12 active, 4 former)

●NSdns1.p01.nsone.net2026-02-18 → 2026-07-13 · 3 obs

○ 2016-04-08 23:45:32
● 2026-02-18 15:18:48
● 2026-07-13 10:30:40

●NSdns1.p02.nsone.net2026-02-18 → 2026-07-13 · 3 obs

○ 2016-04-08 23:45:32
● 2026-02-18 15:18:48
● 2026-07-13 10:30:40

●NSdns2.p01.nsone.net2026-02-18 → 2026-07-13 · 3 obs

○ 2016-04-08 23:45:32
● 2026-02-18 15:18:48
● 2026-07-13 10:30:40

●NSdns3.p01.nsone.net2026-02-18 → 2026-07-13 · 3 obs

○ 2016-04-08 23:45:32
● 2026-02-18 15:18:48
● 2026-07-13 10:30:40

●NSdns4.p01.nsone.net2026-02-18 → 2026-07-13 · 3 obs

○ 2016-04-08 23:45:32
● 2026-02-18 15:18:48
● 2026-07-13 10:30:40

●NSns05.sportsdns.net2026-02-18 → 2026-07-13 · 3 obs

○ 2016-04-08 23:45:32
● 2026-02-18 15:18:48
● 2026-07-13 10:30:40

●NSns06.sportsdns.net2026-02-18 → 2026-07-13 · 3 obs

○ 2016-04-08 23:45:32
● 2026-02-18 15:18:48
● 2026-07-13 10:30:40

●NSns07.sportsdns.net2026-02-18 → 2026-07-13 · 3 obs

○ 2016-04-08 23:45:32
● 2026-02-18 15:18:48
● 2026-07-13 10:30:40

●NSns08.sportsdns.net2026-02-18 → 2026-07-13 · 3 obs

○ 2016-04-08 23:45:32
● 2026-02-18 15:18:48
● 2026-07-13 10:30:40

○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
○ 2026-07-13 10:30:40

○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
○ 2026-07-13 10:30:40

○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
○ 2026-07-13 10:30:40

○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
○ 2026-07-13 10:30:40

●MXmxa-000e8b01.gslb.pphosted.com2015-05-06 → 2026-07-13 · 2 obs

● 2015-05-06 08:51:08
● 2026-07-13 10:30:40

●MXmxb-000e8b01.gslb.pphosted.com2015-05-06 → 2026-07-13 · 2 obs

● 2015-05-06 08:51:08
● 2026-07-13 10:30:40

●A216.206.180.1192015-05-06 → 2026-07-13 · 2 obs

● 2015-05-06 08:51:08
● 2026-07-13 10:30:40

🔍 DNS Trace

📋 Delegation Chain

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

✅ Authoritative Response

Server:45.54.72.1

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: 316ms | 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 each fall under the parent domain opencourse.com.

IP Addresses

opencourse.com resolves to just one IP address, 216.206.180.119.

Name Servers

opencourse.com has 9 name servers — ns05.sportsdns.net, ns06.sportsdns.net, ns07.sportsdns.net and 6 others.

opencourse.com partially shares its NS delegation with several other domains, including dj-outsider.com, dnbdm.fi, bitnye.com and two others.

In DNS configurations, these name servers often share authority with dns1.p01.nsone.net, dns2.p01.nsone.net, dns3.p01.nsone.net and 7 other name servers.

Host names that have two IP addresses:

ns05.sportsdns.net resolves to 45.54.72.1 and 2607:f740:e64f::1.

ns06.sportsdns.net resolves to 45.54.72.65 and 2607:f740:e64f:4::1.

ns07.sportsdns.net resolves to 45.54.72.129 and 2607:f740:e64f:8::1.

ns08.sportsdns.net resolves to 45.54.72.193 and 2607:f740:e64f:c::1.

dns1.p01.nsone.net resolves to 198.51.44.1 and 2620:4d:4000:6259:7:1:0:1.

dns2.p01.nsone.net resolves to 198.51.45.1 and 2a00:edc0:6259:7:1::2.

dns3.p01.nsone.net resolves to 198.51.44.65 and 2620:4d:4000:6259:7:1:0:3.

dns4.p01.nsone.net resolves to 198.51.45.65 and 2a00:edc0:6259:7:1::4.

dns1.p02.nsone.net resolves to 198.51.44.2 and 2620:4d:4000:6259:7:2:0:1.

Mail Servers

opencourse.com is served by two mail servers, mxa-000e8b01.gslb.pphosted.com and mxb-000e8b01.gslb.pphosted.com.

The mail server configuration of opencourse.com is identical to that of other domains, for example jencess.com and activegolf.com.