Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
masttro.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-21 22:54:06 UTC · ↺ Refresh
MX Hostnames
- masttro-com.mail.protection.outlook.com
MX Priorities
- masttro-com.mail.protection.outlook.com: 0
A / AAAA Records
- 198.202.211.1 (no PTR)
Mail Server IPs
- 52.101.8.51 ↩ mail-dm1pr04cu00203.inbound.protection.outlook.com
- 52.101.40.24 ↩ mail-cy5pr05cu00100.inbound.protection.outlook.com
- 52.101.41.56 ↩ mail-sj0pr21cu00100.inbound.protection.outlook.com
- 52.101.11.7 ↩ mail-sa9pr04cu00107.inbound.protection.outlook.com
- 2a01:111:f403:c927:: ↩ mail-bn6pr21cu00500.inbound.protection.outlook.com
- 2a01:111:f403:c91d:: ↩ mail-mw2pr04cu00100.inbound.protection.outlook.com
- 2a01:111:f403:c922:: ↩ mail-bl0pr03cu00200.inbound.protection.outlook.com
- 2a01:111:f403:c946::1 ↩ mail-ch1pr04cu00101.inbound.protection.outlook.com
SOA Record
Raw SOA
a1.uberns.com ipadmin.stabletransit.com 2603190001 3600 300 1814400 300
Primary NS (mname)
a1.uberns.com
Admin Email (rname)
ipadmin@stabletransit.com
Serial
2603190001
Refresh
3600s
Retry
300s
Expire
1814400s
Minimum TTL
300s
Nameservers (NS)
b1.uberns.com
a1.uberns.com
SPF Record
✓ Soft Fail (~all)
v=spf1 a:dnsus1.accellion.com a:dnsus2.accellion.com include:spf.protection.outlook.com include:20433357.spf03.hubspotemail.net ~all
📊 DNS lookups: 4/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1;
✓ 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
7 records- proxy-ssl.webflow.com
- google-site-verification=8TqdOoxdTOvFs1JRQp6YSCKZx6ozG2y_SGk7aWNfx0g
- google-site-verification=N88M8phdVqUBDkYiXhDaDTuOYRayCoP2riBtOSDPIK4
- google-site-verification=Q92W6YSG_hBGiGbSIhKRCJDMIbkLQw9fdA4kMCSfgrU
- google-site-verification=QCahgg3tescPYyUFfs8XGebzxb23jbdkpd7LZ0QyDDU
- SPFv=spf1 a:dnsus1.accellion.com a:dnsus2.accellion.com include:spf.protection.outlook.com include:20433357.spf03.hubspotemail.net ~all
- MS=ms93501486
Full email verification for masttro.com
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