Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
osbig.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-24 00:02:33 UTC · ↺ Refresh
MX Hostnames
- osbig-com.mail.protection.outlook.com
MX Priorities
- osbig-com.mail.protection.outlook.com: 0
A / AAAA Records
- 172.67.167.133 (no PTR)
- 104.21.82.9 (no PTR)
- 2606:4700:3037::ac43:a785
- 2606:4700:3035::6815:5209
Mail Server IPs
- 52.101.9.24 ↩ mail-bl2pr02cu00400.inbound.protection.outlook.com
- 52.101.50.4 ↩ mail-co1pr03cu00404.inbound.protection.outlook.com
- 52.101.50.13 ↩ mail-mw2pr02cu00605.inbound.protection.outlook.com
- 52.101.9.17 (no PTR)
- 2a01:111:f403:c91d::a ↩ mail-co1pr21cu00202.inbound.protection.outlook.com
- 2a01:111:f403:c946::7 ↩ mail-ch5pr02cu00307.inbound.protection.outlook.com
- 2a01:111:f403:f913:: ↩ mail-cy1pr03cu00100.inbound.protection.outlook.com
- 2a01:111:f403:f805::1 ↩ mail-co1pr03cu00301.inbound.protection.outlook.com
SOA Record
Raw SOA
perla.ns.cloudflare.com dns.cloudflare.com 2396421786 10000 2400 604800 1800
Primary NS (mname)
perla.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2396421786
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s
Nameservers (NS)
perla.ns.cloudflare.com
quincy.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
✗ MissingNo DMARC record — emails cannot be rejected on auth failure.
DKIM Selectors
✓ 2 found
selector1._domainkey
selector2._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
2 records- v=verifydomain MS=5522311
- SPFv=spf1 include:spf.protection.outlook.com -all
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