courses4us.com - robtex.com
courses4us.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 | ||||||
Same first word
courses4us.com |
DNS History
17 records (7 active, 10 former)
●NSgreg.ns.cloudflare.com2026-03-14 → 2026-03-14 · 2 obs
● 2026-03-14 10:22:44
○NSns59.domaincontrol.com2018-05-13 → 2018-05-13 · 2 obs
○ 2026-03-14 10:22:44
○NSns60.domaincontrol.com2018-05-13 → 2018-05-13 · 2 obs
○ 2026-03-14 10:22:44
●NSrihana.ns.cloudflare.com2026-03-14 → 2026-03-14 · 2 obs
● 2026-03-14 10:22:44
●MXcourses4us-com.mail.protection.outlook.com2026-03-14 → 2026-03-14 · 1 obs
●A104.21.20.122026-03-14 → 2026-03-14 · 2 obs
● 2026-03-14 10:22:44
●A172.67.190.1972026-03-14 → 2026-03-14 · 2 obs
● 2026-03-14 10:22:44
○A184.168.221.522018-05-13 → 2018-05-13 · 2 obs
○ 2026-03-14 10:22:44
○A184.168.221.552018-05-13 → 2018-05-13 · 2 obs
○ 2026-03-14 10:22:44
○A184.168.221.602018-05-13 → 2018-05-13 · 2 obs
○ 2026-03-14 10:22:44
○A184.168.221.622018-05-13 → 2018-05-13 · 2 obs
○ 2026-03-14 10:22:44
●A2606:4700:3031::ac43:bec52026-03-14 → 2026-03-14 · 2 obs
● 2026-03-14 10:22:44
●A2606:4700:3032::6815:140c2026-03-14 → 2026-03-14 · 2 obs
● 2026-03-14 10:22:44
○A50.63.202.402018-05-13 → 2018-05-13 · 2 obs
○ 2026-03-14 10:22:44
○A50.63.202.422018-05-13 → 2018-05-13 · 2 obs
○ 2026-03-14 10:22:44
○A50.63.202.582018-05-13 → 2018-05-13 · 2 obs
○ 2026-03-14 10:22:44
○A50.63.202.632018-05-13 → 2018-05-13 · 2 obs
○ 2026-03-14 10:22:44
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| courses4us.com | greg.ns.cloudflare.com, rihana.ns.cloudflare.com | 12 records |
✅ Authoritative Response
Server: 173.245.58.244
NS records: greg.ns.cloudflare.com, rihana.ns.cloudflare.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for courses4us.com (unsigned zone)
⏱️ Timing
Total: 135ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 2 | 104.21.20.12, 172.67.190.197 |
| AAAA | 2 | 2606:4700:3031::ac43:bec5, 2606:4700:3032::6815:140c |
| NS | 2 | greg.ns.cloudflare.com, rihana.ns.cloudflare.com |
| MX | 1 | courses4us-com.mail.protection.outlook.c |
| TXT | 3 | _xudw1x5psjlccrhepm7lrj37uz4rnw4, ms-domain-verification=0f8fa59b-58d3-416... |
| HTTPS | 1 | {"priority":1,"target":".","alpn":["h3", |
| SOA | 1 | greg.ns.cloudflare.com dns.cloudflare.co |
📌 Glue Records Collected
Total: 12
Out-of-bailiwick: 12 (greg.ns.cloudflare.com, greg.ns.cloudflare.com, greg.ns.cloudflare.com...)
Analysis
IP Addresses
courses4us.com points to four IP numbers: 2606:4700:3031::ac43:bec5, 2606:4700:3032::6815:140c, 104.21.20.12 and 172.67.190.197.
For instance, other host names gay(0x787878)video.icu, mx1.pro3gsm.com, wanlianhuanbao.com, www.alchemywest.com and betmacan.com share IP numbers with courses4us.com.
Name Servers
courses4us.com is delegated to two name servers: greg.ns.cloudflare.com and rihana.ns.cloudflare.com.
courses4us.com uses the same name server setup as other domains such as hoeber.agency, vebaygiare247.vn, opexegypt.com, umcharlesregional.org and jankolami.shop.
courses4us.com shares name servers with other domains at least partially, for example institutopacifici.com.br, ecr.co.za, naturalcarepro.gr, promin.plus and au64.com.
These name servers are commonly used with harley.ns.cloudflare.com, elias.ns.cloudflare.com and adaline.ns.cloudflare.com.
Host names with six IP numbers: host name greg.ns.cloudflare.com points to: 2606:4700:58::adf5:3b73, 2803:f800:50::6ca2:c173, 2a06:98c1:50::ac40:2173, 108.162.193.115, 172.64.33.115 and 173.245.59.115; host name rihana.ns.cloudflare.com points to: 2606:4700:50::adf5:3af4, 2803:f800:50::6ca2:c0f4, 2a06:98c1:50::ac40:20f4, 108.162.192.244, 172.64.32.244 and 173.245.58.244.
Mail Servers
courses4us.com is handled by a single mail server, courses4us-com.mail.protection.outlook.com.
Host name courses4us-com.mail.protection.outlook.com points to eight IP numbers: 2a01:111:f403:ca04::a, 2a01:111:f403:ca04::d, 2a01:111:f403:ca09::7, 2a01:111:f403:ca09::b, 52.101.68.3, 52.101.68.8, 52.101.68.25 and 52.101.68.27.