Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
nationalconstructioninc.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-19 08:04:19 UTC · ↺ Refresh
MX Hostnames
- nationalconstructioninc-com.mail.protection.outlook.com
MX Priorities
- nationalconstructioninc-com.mail.protection.outlook.com: 0
A / AAAA Records
- 104.17.144.110 (no PTR)
- 104.17.145.110 (no PTR)
- 2606:4700::6811:906e
- 2606:4700::6811:916e
Mail Server IPs
- 52.101.40.2 ↩ mail-cy1pr05cu00402.inbound.protection.outlook.com
- 52.101.10.2 ↩ mail-bn8pr03cu00202.inbound.protection.outlook.com
- 52.101.41.58 ↩ mail-sj0pr02cu00102.inbound.protection.outlook.com
- 52.101.10.5 ↩ mail-bn6pr04cu00105.inbound.protection.outlook.com
- 2a01:111:f403:f802:: ↩ mail-byapr05cu00400.inbound.protection.outlook.com
- 2a01:111:f403:f905::3 ↩ mail-dm5pr02cu00203.inbound.protection.outlook.com
- 2a01:111:f403:f90d::1 ↩ mail-sn1pr0501cu00301.inbound.protection.outlook.com
- 2a01:111:f403:c92c::1 ↩ mail-dm6pr03cu00401.inbound.protection.outlook.com
SOA Record
Raw SOA
maria.ns.cloudflare.com dns.cloudflare.com 2397112868 10000 2400 604800 1800
Primary NS (mname)
maria.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2397112868
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s
Nameservers (NS)
maria.ns.cloudflare.com
sean.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
✓ Reject
v=DMARC1; p=reject; pct=100; rua=mailto:[email protected]; ruf=mailto:[email protected]
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 2 found
selector1._domainkey
selector2._domainkey
✓ Public key: 392 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
5 records- facebook-domain-verification=2tydj04ujgwoumq8f28s3b5qtec8ci
- SPFv=spf1 include:spf.protection.outlook.com -all
- 0ed1fe018a8b8b6676f87d426eb4a87a
- MS=ms28540198
- b4j5pn4ar5jk20hck9v0ve20qa
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