Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
b2constructors.com
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-26 20:43:24 UTC · ↺ Refresh
MX Hostnames
- us1-smtp-mx2.titanhq.com
- us1-smtp-mx1.titanhq.com
MX Priorities
- us1-smtp-mx1.titanhq.com: 0
- us1-smtp-mx2.titanhq.com: 5
A / AAAA Records
- 104.21.13.217 (no PTR)
- 172.67.133.71 (no PTR)
- 2606:4700:3034::6815:dd9 (no PTR)
- 2606:4700:3033::ac43:8547 (no PTR)
Mail Server IPs
- 18.225.12.231 ↩ us1-smtp-mx1.titanhq.com
- 18.218.73.72 ↩ us1-smtp-mx1.titanhq.com
- 18.116.252.179 ↩ us1-smtp-mx1.titanhq.com
SOA Record
Raw SOA
ligia.ns.cloudflare.com dns.cloudflare.com 2399816279 10000 2400 604800 1800
Primary NS (mname)
ligia.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2399816279
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s
Nameservers (NS)
ligia.ns.cloudflare.com
morgan.ns.cloudflare.com
SPF Record
✓ Strict (-all)
v=spf1 mx include:spf.protection.outlook.com -all
📊 DNS lookups: 2/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; rua=mailto:[email protected],mailto:[email protected];
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected],mailto:[email protected]
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- apple-domain-verification=ZMHaQrsMGHimrgB8
- SPFv=spf1 mx include:spf.protection.outlook.com -all
Full email verification for b2constructors.com
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
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