Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
gbsc-usa.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-23 04:24:44 UTC · ↺ Refresh
MX Hostnames
- gbscusa-com01b.mail.protection.outlook.com
MX Priorities
- gbscusa-com01b.mail.protection.outlook.com: 0
A / AAAA Records
- 45.33.87.83 ↩ li1033-83.members.linode.com
Mail Server IPs
- 52.101.50.1 ↩ mail-co1pr05cu00401.inbound.protection.outlook.com
- 52.101.9.14 ↩ mail-bl0pr03cu00206.inbound.protection.outlook.com
- 52.101.194.0 ↩ mail-ch5pr02cu00200.inbound.protection.outlook.com
- 52.101.11.19 ↩ mail-sa9pr04cu00203.inbound.protection.outlook.com
- 2a01:111:f403:c902::16 ↩ mail-byapr04cu00306.inbound.protection.outlook.com
- 2a01:111:f403:c92c::1 ↩ mail-dm6pr03cu00401.inbound.protection.outlook.com
- 2a01:111:f403:c902::4 ↩ mail-sj0pr03cu01504.inbound.protection.outlook.com
- 2a01:111:f403:c936:: ↩ mail-cy1pr05cu00400.inbound.protection.outlook.com
SOA Record
Raw SOA
ns1.linode.com contact.gbsc-usa.com 2021000056 14400 14400 1209600 86400
Primary NS (mname)
ns1.linode.com
Admin Email (rname)
contact@gbsc-usa.com
Serial
2021000056
Refresh
14400s
Retry
14400s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
ns3.linode.com
ns4.linode.com
ns5.linode.com
ns1.linode.com
ns2.linode.com
SPF Record
✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com ip4:45.33.87.83 ip4:104.237.144.27 -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ MissingNo DMARC record — emails cannot be rejected on auth failure.
DKIM Selectors
✗ None detectedNo DKIM records found for common selectors — your provider may use a custom selector name.
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
3 records- MS=ms46479479
- anthropic-domain-verification-rjmx4k=K6lhWLn4IOql061dFnlEKmiYM
- SPFv=spf1 include:spf.protection.outlook.com ip4:45.33.87.83 ip4:104.237.144.27 -all
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