opencourses.com - dns.ninja
opencourses.com
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=1782461615 | ||||||
Same first word
opencourses.mobi |
opencourses.gr |
opencourses.com |
opencourses.co |
opencourses.de |
opencourses.net |
opencourses.ru |
Similar names
DNS History
9 records (6 active, 3 former)
●NSns11.domaincontrol.com2015-07-01 → 2026-06-26 · 2 obs
● 2026-06-26 08:27:26
●NSns12.domaincontrol.com2015-07-01 → 2026-06-26 · 2 obs
● 2026-06-26 08:27:26
●MXmailstore1.secureserver.net2015-07-01 → 2026-06-26 · 2 obs
● 2026-06-26 08:27:26
●MXsmtp.secureserver.net2015-07-01 → 2026-06-26 · 2 obs
● 2026-06-26 08:27:26
○A15.197.142.1732021-10-20 → 2021-10-20 · 4 obs
● 2021-10-20 10:09:30
○ 2026-03-31 07:38:50
○ 2026-06-26 08:27:26
●A15.197.225.1282026-03-31 → 2026-06-26 · 3 obs
● 2026-03-31 07:38:50
● 2026-06-26 08:27:26
○A184.168.221.52015-07-01 → 2017-01-05 · 4 obs
● 2017-01-05 13:03:46
○ 2021-10-20 10:09:30
○ 2026-06-26 08:27:26
○A3.33.152.1472021-10-20 → 2021-10-20 · 4 obs
● 2021-10-20 10:09:30
○ 2026-03-31 07:38:50
○ 2026-06-26 08:27:26
●A3.33.251.1682026-03-31 → 2026-06-26 · 3 obs
● 2026-03-31 07:38:50
● 2026-06-26 08:27:26
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| opencourses.com | ns11.domaincontrol.com, ns12.domaincontrol.com | 4 records |
✅ Authoritative Response
Server:97.74.105.6
NS records: ns11.domaincontrol.com, ns12.domaincontrol.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for opencourses.com (unsigned zone)
⏱️ Timing
Total: 247ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 2 | 15.197.225.128, 3.33.251.168 |
| NS | 2 | ns11.domaincontrol.com, ns12.domaincontrol.com |
| MX | 2 | mailstore1.secureserver.net (pri: 10), smtp.secureserver.net (pri: 0) |
| SOA | 1 | ns11.domaincontrol.com dns.jomax.net |
📌 Glue Records Collected
Total: 4
Out-of-bailiwick: 4 (ns11.domaincontrol.com, ns11.domaincontrol.com, ns12.domaincontrol.com...)
Analysis
IP Addresses
opencourses.com resolves to the IP addresses 3.33.251.168 and 15.197.225.128
Additional host names — sierrahospitality.net, laughlinbroker.com, moodlefoundation.com and two others — share IP numbers with opencourses.com.
Name Servers
The NS records for opencourses.com delegate to ns11.domaincontrol.com and ns12.domaincontrol.com.
opencourses.com shares its name server setup with other domains, including ibewsucks.com, websitepyramid.com, banktechnologysolutions.com and two others.
opencourses.com and other domains like montanabeer.com share at least a portion of their name servers.
ns11.domaincontrol.com resolves to 97.74.105.6 and 2603:5:2190::6. Likewise, ns12.domaincontrol.com resolves to 173.201.73.6 and 2603:5:2290::6 — two IP addresses apiece.
Mail Servers
opencourses.com has two mail servers: mailstore1.secureserver.net and smtp.secureserver.net.
opencourses.com shares the same mail server setup as other domains, including tintumpa.com, bearmate.com, hbot2go.com and two others.
opencourses.com partially shares its mail servers with other domains; known examples include pg92.de, comeat.net and protekresearchlab.com.
mailstore1.secureserver.net and smtp.secureserver.net each resolve to three IP addresses. mailstore1.secureserver.net resolves to 216.69.141.78, 216.69.141.114 and 216.69.141.162. smtp.secureserver.net resolves to 216.69.141.71, 216.69.141.84 and 216.69.141.113.