firstestan.com

Valid Email Server
Domain Lookup › firstestan.com

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
firstestan.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-03-20 22:27:06 UTC · ↺ Refresh

MX Hostnames

  • firstestan-com.mail.protection.outlook.com

MX Priorities

  • firstestan-com.mail.protection.outlook.com: 0

A / AAAA Records

  • 104.21.91.247 (no PTR)
  • 172.67.182.211 (no PTR)
  • 2606:4700:3034::ac43:b6d3 (no PTR)
  • 2606:4700:3031::6815:5bf7 (no PTR)

Mail Server IPs

  • 52.101.157.80 ↩ mail-os8pr02cu00100.inbound.protection.outlook.com
  • 52.101.137.0 ↩ mail-sg2pr03cu00500.inbound.protection.outlook.com
  • 52.101.124.117 ↩ mail-tydpr03cu00105.inbound.protection.outlook.com
  • 2a01:111:f403:cc1a::8 ↩ mail-tydpr03cu00100.inbound.protection.outlook.com
  • 2a01:111:f403:cc09:: ↩ mail-sg2pr03cu00500.inbound.protection.outlook.com
  • 2a01:111:f403:cc1f::4 ↩ mail-os8pr02cu00104.inbound.protection.outlook.com

SOA Record

Raw SOA dax.ns.cloudflare.com dns.cloudflare.com 2397894340 10000 2400 604800 1800
Primary NS (mname)
dax.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2397894340
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s

Nameservers (NS)

dee.ns.cloudflare.com
dax.ns.cloudflare.com

SPF Record

✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

✗ Missing

No DMARC record — emails cannot be rejected on auth failure.

DKIM Selectors

✗ None detected

No DKIM records found for common selectors — your provider may use a custom selector name.

Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses

All TXT Records

1 record
  • SPFv=spf1 include:spf.protection.outlook.com -all
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