Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
crestkey.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-18 13:48:44 UTC · ↺ Refresh
MX Hostnames
- crestkey-com.mail.protection.outlook.com
MX Priorities
- crestkey-com.mail.protection.outlook.com: 0
A / AAAA Records
- 172.67.134.119 (no PTR)
- 104.21.25.185 (no PTR)
- 2606:4700:3036::6815:19b9
- 2606:4700:3033::ac43:8677
Mail Server IPs
- 52.101.9.24 ↩ mail-bl2pr02cu00400.inbound.protection.outlook.com
- 52.101.194.4 ↩ mail-ch4pr04cu00104.inbound.protection.outlook.com
- 52.101.50.4 ↩ mail-co1pr03cu00404.inbound.protection.outlook.com
- 52.101.50.13 ↩ mail-mw2pr02cu00605.inbound.protection.outlook.com
- 2a01:111:f403:c946::5 ↩ mail-ch4pr21cu00105.inbound.protection.outlook.com
- 2a01:111:f403:c902::2 ↩ mail-sj0pr03cu01602.inbound.protection.outlook.com
- 2a01:111:f403:c902::14 ↩ mail-byapr04cu00204.inbound.protection.outlook.com
- 2a01:111:f403:f913:: ↩ mail-cy1pr03cu00100.inbound.protection.outlook.com
SOA Record
Raw SOA
kirk.ns.cloudflare.com dns.cloudflare.com 2399253919 10000 2400 604800 1800
Primary NS (mname)
kirk.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2399253919
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s
Nameservers (NS)
magdalena.ns.cloudflare.com
kirk.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
✗ p=none
v=DMARC1; p=none; rua=mailto:[email protected]
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 4 found
selector1._domainkey
selector2._domainkey
s1._domainkey
s2._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: selector1
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
4 records- SPFv=spf1 include:spf.protection.outlook.com -all
- v=verifydomain MS=5720812
- brevo-code:080888a486b599d5170f3c93639ee7bc
- google-site-verification=byL7cmqj82RdZYVNEzhZfiyKJf2kg_2MrboufQJcqXA
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