opencourseware.com - dns.ninja
opencourseware.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 104.143.9.210🇺🇸 THEPRODUCERS104.143.9.0/24 The Producers, Inc. Equinix NY4 | ||||||
| A | 104.143.9.211🇺🇸 THEPRODUCERS104.143.9.0/24 The Producers, Inc. Equinix NY4 | ||||||
| NS | ns0.directnic.com ⭐ | ||||||
| A | 2602:fc8e:0:688f:9::41🇺🇸 THEPRODUCERS2602:fc8e::/40 The Producers, Inc. Equinix NY4 | ||||||
| A | 104.143.9.41🇺🇸 THEPRODUCERS104.143.9.0/24 The Producers, Inc. Equinix NY4 | ||||||
| NS | ns1.directnic.com | ||||||
| A | 2600:3c01::f03c:94ff:fe81:e767🇺🇸 AKAMAI-LINODE-AP2600:3c01::/32 Akamai Technologies | ||||||
| A | 23.239.4.33🇺🇸 AKAMAI-LINODE-AP23.239.0.0/21 Akamai Technologies | ||||||
| PTR | dnic-ns1.directnic.net | ||||||
| NS | ns2.directnic.com | ||||||
| A | 2602:fc8e:0:688f:9::42🇺🇸 THEPRODUCERS2602:fc8e::/40 The Producers, Inc. Equinix NY4 | ||||||
| A | 104.143.9.42🇺🇸 THEPRODUCERS104.143.9.0/24 The Producers, Inc. Equinix NY4 | ||||||
| NS | ns3.directnic.com | ||||||
| A | 2600:3c00::f03c:94ff:fe81:b947🇺🇸 AKAMAI-LINODE-AP2600:3c00::/32 Akamai Technologies | ||||||
| A | 45.33.11.85🇺🇸 AKAMAI-LINODE-AP45.33.0.0/19 Akamai Technologies | ||||||
| PTR | dnic-ns3.directnic.net | ||||||
| SOA | ns0.directnic.comhostmaster@ns0.directnic.com 2018-02-06 #12 | ||||||
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.netnstld@verisign-grs.com serial=1782895931 | ||||||
Same first word
opencourseware.de |
opencourseware.me |
opencourseware.online |
opencourseware.org |
opencourseware.net |
opencourseware.eu |
opencourseware.com |
opencourseware.co.uk |
Similar names
DNS History
10 records (6 active, 4 former)
●NSns0.directnic.com2026-02-22 → 2026-07-01 · 3 obs
● 2026-02-22 18:10:52
● 2026-07-01 08:59:46
●NSns1.directnic.com2026-02-22 → 2026-07-01 · 3 obs
● 2026-02-22 18:10:52
● 2026-07-01 08:59:46
○NSns1.sjdjweis.com2015-08-05 → 2017-03-24 · 4 obs
● 2017-03-24 19:57:36
○ 2026-02-22 18:10:52
○ 2026-07-01 08:59:46
●NSns2.directnic.com2026-02-22 → 2026-07-01 · 3 obs
● 2026-02-22 18:10:52
● 2026-07-01 08:59:46
○NSns2.sjdjweis.com2015-08-05 → 2017-03-24 · 4 obs
● 2017-03-24 19:57:36
○ 2026-02-22 18:10:52
○ 2026-07-01 08:59:46
●NSns3.directnic.com2026-02-22 → 2026-07-01 · 3 obs
● 2026-02-22 18:10:52
● 2026-07-01 08:59:46
○MXmail.opencourseware.com2015-08-05 → 2017-03-24 · 4 obs
● 2017-03-24 19:57:36
○ 2026-02-22 18:10:52
○ 2026-07-01 08:59:46
●A104.143.9.2102026-02-22 → 2026-07-01 · 3 obs
● 2026-02-22 18:10:52
● 2026-07-01 08:59:46
●A104.143.9.2112026-02-22 → 2026-07-01 · 3 obs
● 2026-02-22 18:10:52
● 2026-07-01 08:59:46
○A209.234.75.1302015-08-05 → 2017-03-24 · 4 obs
● 2017-03-24 19:57:36
○ 2026-02-22 18:10:52
○ 2026-07-01 08:59:46
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | d.gtld-servers.net, a.gtld-servers.net, k.gtld-servers.net, f.gtld-servers.net... | - |
| opencourseware.com | ns0.directnic.com, ns1.directnic.com, ns3.directnic.com, ns2.directnic.com | 8 records |
✅ Authoritative Response
Server:104.143.9.42
NS records: ns0.directnic.com, ns1.directnic.com, ns3.directnic.com, ns2.directnic.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for opencourseware.com (unsigned zone)
⏱️ Timing
Total: 214ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 2 | 104.143.9.210, 104.143.9.211 |
| NS | 4 | ns1.directnic.com, ns3.directnic.com... |
| SOA | 1 | ns0.directnic.com hostmaster.ns0.directn |
📌 Glue Records Collected
Total: 8
Out-of-bailiwick: 8 (ns0.directnic.com, ns0.directnic.com, ns1.directnic.com...)
Analysis
IP Addresses
opencourseware.com points to the IP addresses 104.143.9.210 and 104.143.9.211
Additional host names — www.tireinstallers.net, ellescrubs.com, www.amishworkshops.com and two others — share IP numbers with opencourseware.com.
Name Servers
opencourseware.com has four authoritative name servers: ns0.directnic.com, ns1.directnic.com, ns2.directnic.com and ns3.directnic.com.
At least some of opencourseware.com's name servers are shared with other domains, for example davisonflorist.com, lindamcclurejewelry.com, katori-shinto-ryu.org and two more.
Four hostnames, each resolving to a pair of IP addresses: ns0.directnic.com directs to 104.143.9.41 and 2602:fc8e:0:688f:9::41; ns1.directnic.com directs to 23.239.4.33 and 2600:3c01::f03c:94ff:fe81:e767; ns2.directnic.com directs to 104.143.9.42 and 2602:fc8e:0:688f:9::42; ns3.directnic.com directs to 45.33.11.85 and 2600:3c00::f03c:94ff:fe81:b947.