cursosbios.com - robtex.com
cursosbios.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 162.252.86.138🇺🇸 HIVELOCITY-1162.252.86.0/24 Hivelocity Prefix announced upstream | ||||||
| PTR | srv13.infranetdns.com | ||||||
| NS | srv13.infranetdns.com ⭐ ⚠️ Not in parent delegation | ||||||
| A | 162.252.86.138🇺🇸 HIVELOCITY-1162.252.86.0/24 Hivelocity Prefix announced upstream | ||||||
| PTR | srv13.infranetdns.com | ||||||
| NS | srv13a.infranetdns.com ⚠️ Not in parent delegation | ||||||
| A | 162.252.86.139🇺🇸 HIVELOCITY-1162.252.86.0/24 Hivelocity Prefix announced upstream | ||||||
| PTR | franquicias-int.com | ||||||
| NS | srv299.infranetworking.com ⚠️ Not in zone NS records | ||||||
| A | 162.252.86.138🇺🇸 HIVELOCITY-1162.252.86.0/24 Hivelocity Prefix announced upstream | ||||||
| PTR | srv13.infranetdns.com | ||||||
| NS | srv300.infranetworking.com ⚠️ Not in zone NS records | ||||||
| A | 162.252.86.139🇺🇸 HIVELOCITY-1162.252.86.0/24 Hivelocity Prefix announced upstream | ||||||
| PTR | franquicias-int.com | ||||||
| MX | cursosbios.com ⭐ | ||||||
| A | 162.252.86.138🇺🇸 HIVELOCITY-1162.252.86.0/24 Hivelocity Prefix announced upstream | ||||||
| PTR | srv13.infranetdns.com | ||||||
| TXT | v=spf1 +a +mx +ip4:162.252.86.138 +ip4:209.133.220.58 +ip4:69.175.33.26 +ip4:... | ||||||
| SOA | srv13.infranetdns.comsoporte@infranetworking.com 2026-02-15 #0 | ||||||
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=1774393017 | ||||||
MX for
cursosbios.com |
Same first word
cursosbios.com |
DNS History
7 records (6 active, 1 former)
●NSsrv13.infranetdns.com2026-03-01 → 2026-03-24 · 3 obs
● 2026-03-01 20:31:52
● 2026-03-24 23:26:00
●NSsrv13a.infranetdns.com2026-03-01 → 2026-03-24 · 3 obs
● 2026-03-01 20:31:52
● 2026-03-24 23:26:00
●NSsrv299.infranetworking.com2015-05-19 → 2026-03-24 · 2 obs
● 2026-03-24 23:26:00
●NSsrv300.infranetworking.com2015-05-19 → 2026-03-24 · 2 obs
● 2026-03-24 23:26:00
●MXcursosbios.com2015-05-19 → 2026-03-24 · 2 obs
● 2026-03-24 23:26:00
●A162.252.86.1382026-03-01 → 2026-03-24 · 3 obs
● 2026-03-01 20:31:52
● 2026-03-24 23:26:00
○A69.175.33.262015-05-19 → 2017-05-26 · 4 obs
● 2017-05-26 13:42:16
○ 2026-03-01 20:31:52
○ 2026-03-24 23:26:00
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | f.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, l.gtld-servers.net... | - |
| cursosbios.com | srv299.infranetworking.com, srv300.infranetworking.com | 2 records |
✅ Authoritative Response
Server:162.252.86.139
NS records: srv299.infranetworking.com, srv300.infranetworking.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for cursosbios.com (unsigned zone)
⏱️ Timing
Total: 303ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 162.252.86.138 |
| NS | 2 | srv13a.infranetdns.com, srv13.infranetdns.com |
| MX | 1 | cursosbios.com (pri: 0) |
| TXT | 1 | v=spf1 +a +mx +ip4:162.252.86.138 +ip4:2 |
| SOA | 1 | srv13.infranetdns.com soporte.infranetwo |
📌 Glue Records Collected
Total: 2
Out-of-bailiwick: 2 (srv299.infranetworking.com, srv300.infranetworking.com)
Analysis
Mail Server Role
cursosbios.com serves as the mail server for cursosbios.com.
IP Addresses
cursosbios.com points to IP number 162.252.86.138.
For instance, other host names minithongs.com, ns1.expresatemail.com, srv08.infranetdns.com, www.feelmedellin.com and modelosbrasilenas.com share IP numbers with cursosbios.com.
Name Servers
cursosbios.com is delegated to four name servers: srv13.infranetdns.com, srv13a.infranetdns.com, srv299.infranetworking.com and srv300.infranetworking.com.
cursosbios.com shares name servers with other domains at least partially, for example aquariomedia.com, ismm.com.ve, demox.com.ar, unitica.com.mx and masterproduction.mx.
these name servers are commonly used together with the name servers srv04.infranetdns.com, srv04a.infranetdns.com, srv02a.infranetdns.com, srv02b.infranetdns.com, srv08a.infranetdns.com, ns2.expresatemail.com, ns1.dizucarhub.net and ns2.dizucarhub.net.
Host names sharing one IP address:
The host name srv13.infranetdns.com points to 162.252.86.138.
The host name srv13a.infranetdns.com points to 162.252.86.139.
The host name srv299.infranetworking.com points to 162.252.86.138.
The host name srv300.infranetworking.com points to 162.252.86.139.
Host names pointing to 162.252.86.138: srv13.infranetdns.com and srv299.infranetworking.com
Host names pointing to 162.252.86.139: srv13a.infranetdns.com and srv300.infranetworking.com
Mail Servers
cursosbios.com is handled by a single mail server, cursosbios.com.
cursosbios.com points to a single IP: 162.252.86.138.