course20.com - robtex.com
course20.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 2606:4700:3030::ac43:a2c0🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 2606:4700:3032::6815:a5a🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 104.21.10.90Cloudflare104.21.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 172.67.162.192🇺🇸 Cloudflare172.67.160.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| NS | aleena.ns.cloudflare.com ⭐ | ||||||
| A | 2606:4700:50::a29f:2651🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | aleena.ns.cloudflare.com | ||||||
| A | 2803:f800:50::6ca2:c251🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L | ||||||
| PTR | aleena.ns.cloudflare.com | ||||||
| A | 2a06:98c1:50::ac40:2251🇺🇸 Cloudflare2a06:98c1:50::/45 | ||||||
| PTR | aleena.ns.cloudflare.com | ||||||
| A | 108.162.194.81🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | aleena.ns.cloudflare.com | ||||||
| A | 162.159.38.81Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | aleena.ns.cloudflare.com | ||||||
| A | 172.64.34.81🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | aleena.ns.cloudflare.com | ||||||
| NS | ignacio.ns.cloudflare.com | ||||||
| A | 2606:4700:58::a29f:2c52🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | ignacio.ns.cloudflare.com | ||||||
| A | 2803:f800:50::6ca2:c352🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L | ||||||
| PTR | ignacio.ns.cloudflare.com | ||||||
| A | 2a06:98c1:50::ac40:2352🇺🇸 Cloudflare2a06:98c1:50::/45 | ||||||
| PTR | ignacio.ns.cloudflare.com | ||||||
| A | 108.162.195.82🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | ignacio.ns.cloudflare.com | ||||||
| A | 162.159.44.82Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | ignacio.ns.cloudflare.com | ||||||
| A | 172.64.35.82🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | ignacio.ns.cloudflare.com | ||||||
| HTTPS | HTTP/3, HTTP/2 ✓ hints match | ||||||
| IPv4 hints | 104.21.10.90, 172.67.162.192 | ||||||
| IPv6 hints | 2606:4700:3030::ac43:a2c0, 2606:4700:3032::6815:a5a | ||||||
| ECH | X25519, HKDF-SHA256 + AES-128-GCM draft, id=83, name=cloudflare-ech.com | ||||||
| SOA | aleena.ns.cloudflare.comdns@cloudflare.com serial=2401491279 | ||||||
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=1776110072 | ||||||
Same first word
course20.com |
DNS History
6 records (6 active, 0 former)
●NSaleena.ns.cloudflare.com2026-02-16 → 2026-04-13 · 2 obs
● 2026-04-13 20:24:26
●NSignacio.ns.cloudflare.com2026-02-16 → 2026-04-13 · 2 obs
● 2026-04-13 20:24:26
●A104.21.10.902026-02-16 → 2026-04-13 · 2 obs
● 2026-04-13 20:24:26
●A172.67.162.1922026-02-16 → 2026-04-13 · 2 obs
● 2026-04-13 20:24:26
●A2606:4700:3030::ac43:a2c02026-02-16 → 2026-04-13 · 2 obs
● 2026-04-13 20:24:26
●A2606:4700:3032::6815:a5a2026-02-16 → 2026-04-13 · 2 obs
● 2026-04-13 20:24:26
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| course20.com | aleena.ns.cloudflare.com, ignacio.ns.cloudflare.com | 12 records |
✅ Authoritative Response
Server:108.162.194.81
NS records: aleena.ns.cloudflare.com, ignacio.ns.cloudflare.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for course20.com (unsigned zone)
⏱️ Timing
Total: 137ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 2 | 104.21.10.90, 172.67.162.192 |
| AAAA | 2 | 2606:4700:3030::ac43:a2c0, 2606:4700:3032::6815:a5a |
| NS | 2 | aleena.ns.cloudflare.com, ignacio.ns.cloudflare.com |
| HTTPS | 1 | {"priority":1,"target":".","alpn":["h3", |
| SOA | 1 | aleena.ns.cloudflare.com dns.cloudflare. |
📌 Glue Records Collected
Total: 12
Out-of-bailiwick: 12 (aleena.ns.cloudflare.com, aleena.ns.cloudflare.com, aleena.ns.cloudflare.com...)
Analysis
IP Addresses
course20.com resolves to four IPs: 2606:4700:3030::ac43:a2c0, 2606:4700:3032::6815:a5a, 104.21.10.90 and 172.67.162.192.
Other host names such as tvchak176.com, forgeofice.com, www.xmschool.net, ppw6g82.com and iriswavejunction.club share IP numbers with course20.com.
Name Servers
course20.com is delegated to two name servers: aleena.ns.cloudflare.com and ignacio.ns.cloudflare.com.
course20.com uses the same name server setup as other domains, including ytddsm.com, uhiuhi.com, cdpjohnyu.com, 53qf.com and theperitusgroup.com.
At least part of the name servers for course20.com are shared with other domains, for instance ivmekoleji.com, dsgj668.com, dtsprint.com, theminingalliance.com and advantureco.com.
These name servers are commonly used with abdullah.ns.cloudflare.com, kelly.ns.cloudflare.com, wren.ns.cloudflare.com and christian.ns.cloudflare.com.
Host names with six IP numbers:
aleena.ns.cloudflare.com points to: 2606:4700:50::a29f:2651, 2803:f800:50::6ca2:c251, 2a06:98c1:50::ac40:2251, 108.162.194.81, 162.159.38.81 and 172.64.34.81.
ignacio.ns.cloudflare.com points to: 2606:4700:58::a29f:2c52, 2803:f800:50::6ca2:c352, 2a06:98c1:50::ac40:2352, 108.162.195.82, 162.159.44.82 and 172.64.35.82.