courses4u.com.br - robtex.com
courses4u.com.br
| DNSSEC | ⚠️ Not signed | ||||||
| A | 162.240.3.28🇺🇸 EIGI162.240.0.0/15 1958 South 950 East Provo UT 84606 United States | ||||||
| PTR | vps-6915739.courses4u.com.br | ||||||
| NS | ns1.courses4u.com.br ⭐ | ||||||
| A | 162.240.3.28🇺🇸 EIGI162.240.0.0/15 1958 South 950 East Provo UT 84606 United States | ||||||
| PTR | vps-6915739.courses4u.com.br | ||||||
| NS | ns2.courses4u.com.br | ||||||
| A | 162.240.3.168🇺🇸 EIGI162.240.0.0/15 1958 South 950 East Provo UT 84606 United States | ||||||
| PTR | 162-240-3-168.unifiedlayer.com | ||||||
| MX | mail.courses4u.com.br ⭐ | ||||||
| A | 162.240.3.28🇺🇸 EIGI162.240.0.0/15 1958 South 950 East Provo UT 84606 United States | ||||||
| PTR | vps-6915739.courses4u.com.br | ||||||
| TXT | v=spf1 ip4:162.240.3.28 +a +mx ~all | ||||||
| SOA | ns1.courses4u.com.brroot@vps-6915739.courses4u.com.br 2026-04-01 #1 | ||||||
com.br
| DNSSEC | ⚠️ Not signed | ||||||
| NS | a.dns.br ⭐ ⚠️ Not in parent delegation | ||||||
| NS | b.dns.br ⚠️ Not in parent delegation | ||||||
| NS | c.dns.br ⚠️ Not in parent delegation | ||||||
| NS | d.dns.br ⚠️ Not in parent delegation | ||||||
| NS | e.dns.br ⚠️ Not in parent delegation | ||||||
| NS | f.dns.br ⚠️ Not in parent delegation | ||||||
| SOA | a.dns.brhostmaster@registro.br serial=2026104120 | ||||||
rank #4104 in the tld
WOT: SAFE (69/100)
Subdomains
ns2.courses4u.com.br |
vps-6915739.courses4u.com.br |
mail.courses4u.com.br |
www.courses4u.com.br |
ns1.courses4u.com.br |
Same first word
DNS History
13 records (4 active, 9 former)
●NSns1.courses4u.com.br2026-02-17 → 2026-04-14 · 3 obs
● 2026-02-17 10:52:36
● 2026-04-14 05:28:02
○NSns1.dreamhost.com2015-05-18 → 2018-10-23 · 4 obs
● 2018-10-23 00:34:44
○ 2026-02-17 10:52:36
○ 2026-04-14 05:28:02
●NSns2.courses4u.com.br2026-02-17 → 2026-04-14 · 3 obs
● 2026-02-17 10:52:36
● 2026-04-14 05:28:02
○NSns2.dreamhost.com2015-05-18 → 2018-10-23 · 4 obs
● 2018-10-23 00:34:44
○ 2026-02-17 10:52:36
○ 2026-04-14 05:28:02
○NSns3.dreamhost.com2015-05-18 → 2018-10-23 · 4 obs
● 2018-10-23 00:34:44
○ 2026-02-17 10:52:36
○ 2026-04-14 05:28:02
●MXmail.courses4u.com.br2026-02-17 → 2026-04-14 · 3 obs
● 2026-02-17 10:52:36
● 2026-04-14 05:28:02
○MXmx1.dreamhost.com2018-10-23 → 2018-10-23 · 4 obs
● 2018-10-23 00:34:44
○ 2026-02-17 10:52:36
○ 2026-04-14 05:28:02
○MXmx1.sub4.homie.mail.dreamhost.com2015-05-18 → 2017-02-05 · 4 obs
● 2017-02-05 15:35:10
○ 2018-10-23 00:34:44
○ 2026-04-14 05:28:02
○MXmx2.dreamhost.com2018-10-23 → 2018-10-23 · 4 obs
● 2018-10-23 00:34:44
○ 2026-02-17 10:52:36
○ 2026-04-14 05:28:02
○MXmx2.sub4.homie.mail.dreamhost.com2015-05-18 → 2017-02-05 · 4 obs
● 2017-02-05 15:35:10
○ 2018-10-23 00:34:44
○ 2026-04-14 05:28:02
●A162.240.3.282026-02-17 → 2026-04-14 · 3 obs
● 2026-02-17 10:52:36
● 2026-04-14 05:28:02
○A208.113.204.1162015-05-18 → 2017-02-05 · 4 obs
● 2017-02-05 15:35:10
○ 2018-10-23 00:34:44
○ 2026-04-14 05:28:02
○A208.113.206.122018-10-23 → 2018-10-23 · 4 obs
● 2018-10-23 00:34:44
○ 2026-02-17 10:52:36
○ 2026-04-14 05:28:02
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| br | f.dns.br, b.dns.br, a.dns.br, c.dns.br... | - |
| courses4u.com.br | ns1.courses4u.com.br, ns2.courses4u.com.br | 2 records |
✅ Authoritative Response
Server:162.240.3.28
NS records: ns1.courses4u.com.br, ns2.courses4u.com.br
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for courses4u.com.br (unsigned zone)
⏱️ Timing
Total: 440ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 162.240.3.28 |
| NS | 2 | ns2.courses4u.com.br, ns1.courses4u.com.br |
| MX | 1 | mail.courses4u.com.br (pri: 0) |
| TXT | 1 | v=spf1 ip4:162.240.3.28 +a +mx ~all |
| SOA | 1 | ns1.courses4u.com.br root.vps-6915739.co |
📌 Glue Records Collected
Total: 2
In-bailiwick: 2 (ns1.courses4u.com.br, ns2.courses4u.com.br)
Analysis
Hierarchy
courses4u.com.br is a parent of ns2.courses4u.com.br, vps-6915739.courses4u.com.br, mail.courses4u.com.br, www.courses4u.com.br and ns1.courses4u.com.br.
IP Addresses
courses4u.com.br points to a single IP number: 162.240.3.28.
Other host names, for instance vps-6915739.courses4u.com.br, mail.courses4u.com.br and ns1.courses4u.com.br share IP numbers with courses4u.com.br.
Name Servers
courses4u.com.br is delegated to two name servers: ns1.courses4u.com.br and ns2.courses4u.com.br.
courses4u.com.br uses the same name server setup as other domains, including ns1.courses4u.com.br and ns2.courses4u.com.br.
Host names with one IP number:
ns1.courses4u.com.br points to: 162.240.3.28.
ns2.courses4u.com.br points to: 162.240.3.168.
Mail Servers
The mail server for courses4u.com.br is mail.courses4u.com.br.
Host name mail.courses4u.com.br resolves to IP 162.240.3.28.