course-on.com - robtex.com
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course-on.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=1771291435 | ||||||
PTR for
Same first word
course-on.com |
Similar names
DNS History
15 records (7 active, 8 former)
○NSalpha.freehost.com.ua2015-06-20 → 2017-03-14 · 4 obs
● 2017-03-14 14:04:42
○ 2026-02-17 11:26:20
○ 2026-02-17 11:26:22
○NSbeta.freehost.com.ua2015-06-20 → 2017-03-14 · 4 obs
● 2017-03-14 14:04:42
○ 2026-02-17 11:26:20
○ 2026-02-17 11:26:22
●NSbrynne.ns.cloudflare.com2026-02-17 → 2026-02-17 · 3 obs
● 2026-02-17 11:26:20
● 2026-02-17 11:26:22
○NSgamma.freehost.com.ua2015-06-20 → 2017-03-14 · 4 obs
● 2017-03-14 14:04:42
○ 2026-02-17 11:26:20
○ 2026-02-17 11:26:22
●NSmajor.ns.cloudflare.com2026-02-17 → 2026-02-17 · 3 obs
● 2026-02-17 11:26:20
● 2026-02-17 11:26:22
●MX_dc-mx.28f3d30d809e.course-on.com2026-02-17 → 2026-02-17 · 3 obs
● 2026-02-17 11:26:20
● 2026-02-17 11:26:22
○MXmail0.freehost.com.ua2015-06-20 → 2017-03-14 · 4 obs
● 2017-03-14 14:04:42
○ 2026-02-17 11:26:20
○ 2026-02-17 11:26:22
○MXmail1.freehost.com.ua2015-06-20 → 2017-03-14 · 4 obs
● 2017-03-14 14:04:42
○ 2026-02-17 11:26:20
○ 2026-02-17 11:26:22
○MXmail2.freehost.com.ua2015-06-20 → 2017-03-14 · 4 obs
● 2017-03-14 14:04:42
○ 2026-02-17 11:26:20
○ 2026-02-17 11:26:22
●A104.21.95.1622026-02-17 → 2026-02-17 · 3 obs
● 2026-02-17 11:26:20
● 2026-02-17 11:26:22
●A172.67.145.2382026-02-17 → 2026-02-17 · 3 obs
● 2026-02-17 11:26:20
● 2026-02-17 11:26:22
○A178.20.153.1112016-01-22 → 2017-03-14 · 5 obs
● 2016-01-22 18:46:56
● 2017-03-14 14:04:42
○ 2026-02-17 11:26:20
○ 2026-02-17 11:26:22
○A178.20.153.662015-06-20 → 2015-11-22 · 4 obs
● 2015-11-22 07:37:46
○ 2016-01-22 18:46:56
○ 2026-02-17 11:26:22
●A2606:4700:3031::ac43:91ee2026-02-17 → 2026-02-17 · 3 obs
● 2026-02-17 11:26:20
● 2026-02-17 11:26:22
●A2606:4700:3035::6815:5fa22026-02-17 → 2026-02-17 · 3 obs
● 2026-02-17 11:26:20
● 2026-02-17 11:26:22
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | l.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net... | - |
| course-on.com | major.ns.cloudflare.com, brynne.ns.cloudflare.com | 12 records |
✅ Authoritative Response
Server: 108.162.193.241
NS records: major.ns.cloudflare.com, brynne.ns.cloudflare.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for course-on.com (unsigned zone)
⏱️ Timing
Total: 121ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 2 | 172.67.145.238, 104.21.95.162 |
| AAAA | 2 | 2606:4700:3035::6815:5fa2, 2606:4700:3031::ac43:91ee |
| NS | 2 | brynne.ns.cloudflare.com, major.ns.cloudflare.com |
| MX | 1 | _dc-mx.28f3d30d809e.course-on.com (pri: |
| TXT | 1 | v=spf1 mx ~all |
| HTTPS | 1 | {"priority":1,"target":".","alpn":["h3", |
| SOA | 1 | brynne.ns.cloudflare.com dns.cloudflare. |
📌 Glue Records Collected
Total: 12
Out-of-bailiwick: 12 (major.ns.cloudflare.com, major.ns.cloudflare.com, major.ns.cloudflare.com...)
AI analysis
course-on.com points to four IP numbers: 2606:4700:3031::ac43:91ee, 2606:4700:3035::6815:5fa2, 104.21.95.162 and 172.67.145.238.
Other host names including hotelscombined.lv, webpro-it.co.uk, www.diaryofaquilter.com, diaryofaquilter.com and 594s.com share IP numbers with course-on.com.
course-on.com's delegation uses two name servers, brynne.ns.cloudflare.com and major.ns.cloudflare.com.
course-on.com shares the same name server setup as other domains, for example dot39.com, joingrouper.com, brasilmetropole.com.br, catespark.com and deepcovekayak.com.
course-on.com at least partially shares name servers with other domains, including deepwater-valves.com, optelvision.com, encontreoportunidades.com.br, brickimobiliaria.com.br and kbitconsultants.com.au.
These name servers are often used together with dora.ns.cloudflare.com.
Host names with six IP numbers:
brynne.ns.cloudflare.com points to: 2606:4700:50::a29f:2641, 2803:f800:50::6ca2:c241, 2a06:98c1:50::ac40:2241, 108.162.194.65, 162.159.38.65 and 172.64.34.65.
major.ns.cloudflare.com points to: 2606:4700:58::adf5:3bf1, 2803:f800:50::6ca2:c1f1, 2a06:98c1:50::ac40:21f1, 108.162.193.241, 172.64.33.241 and 173.245.59.241.
course-on.com is handled by a single mail server, _dc-mx.28f3d30d809e.course-on.com.
_dc-mx.28f3d30d809e.course-on.com points to a single IP: 95.217.117.236.