mailnull.courseapp.com - dns.ninja
mailnull.courseapp.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 165.227.228.80🇬🇧 DIGITALOCEAN165.227.224.0/20 DigitalOcean | ||||||
courseapp.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 2606:4700:3031::6815:492c🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 2606:4700:3034::ac43:8c20🇺🇸 Cloudflare2606:4700:3034::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 104.21.73.44Cloudflare104.21.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 172.67.140.32🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| NS | maleah.ns.cloudflare.com ⭐ | ||||||
| NS | walt.ns.cloudflare.com | ||||||
| MX | courseapp-com.mail.protection.outlook.com ⭐ | ||||||
| TXT | MS=ms87134365 | ||||||
| TXT | MS=ms90939751 | ||||||
| TXT | google-site-verification=KjAct9yKIIT4DKeCBBOrM1erHVP93C4-Jci3rq1hk9M | ||||||
| TXT | v=spf1 a mx include:spf.protection.outlook.com +ip4 -all | ||||||
| HTTPS | HTTP/3, HTTP/2 ✓ hints match | ||||||
| IPv4 hints | 104.21.73.44, 172.67.140.32 | ||||||
| IPv6 hints | 2606:4700:3031::6815:492c, 2606:4700:3034::ac43:8c20 | ||||||
| ECH | X25519, HKDF-SHA256 + AES-128-GCM draft, id=233, name=cloudflare-ech.com | ||||||
| SOA | maleah.ns.cloudflare.comdns@cloudflare.com serial=2406178900 | ||||||
Previously MX for
Same first word
Similar names
DNS History
1 record (1 active, 0 former)
●A165.227.228.802026-07-05 → 2026-07-05 · 2 obs
● 2026-07-05 09:57:54
● 2026-07-05 09:57:56
● 2026-07-05 09:57:56
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | m.gtld-servers.net, e.gtld-servers.net, d.gtld-servers.net, b.gtld-servers.net... | - |
| courseapp.com | walt.ns.cloudflare.com, maleah.ns.cloudflare.com | 12 records |
✅ Authoritative Response
Server:108.162.193.148
NS records: walt.ns.cloudflare.com, maleah.ns.cloudflare.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for courseapp.com (unsigned zone)
⏱️ Timing
Total: 82ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 165.227.228.80 |
📌 Glue Records Collected
Total: 12
Out-of-bailiwick: 12 (walt.ns.cloudflare.com, walt.ns.cloudflare.com, walt.ns.cloudflare.com...)
Analysis
IP Addresses
mailnull.courseapp.com resolves to one IP address: 165.227.228.80.