Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
gcb.edu.co
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-26 00:46:20 UTC · ↺ Refresh
MX Hostnames
- gcb-edu-co.mail.protection.outlook.com
MX Priorities
- gcb-edu-co.mail.protection.outlook.com: 0
A / AAAA Records
- 160.153.0.44 ↩ 44.0.153.160.host.secureserver.net
Mail Server IPs
- 52.101.11.19 ↩ mail-sa9pr04cu00203.inbound.protection.outlook.com
- 52.101.10.2 ↩ mail-bn8pr03cu00202.inbound.protection.outlook.com
- 52.101.42.16 ↩ mail-co1pr05cu00300.inbound.protection.outlook.com
- 52.101.41.56 ↩ mail-sj0pr21cu00100.inbound.protection.outlook.com
- 2a01:111:f403:f908:: ↩ mail-bn1pr21cu00100.inbound.protection.outlook.com
- 2a01:111:f403:c92c::1 ↩ mail-dm6pr03cu00401.inbound.protection.outlook.com
- 2a01:111:f403:c902::2 ↩ mail-sj0pr03cu01602.inbound.protection.outlook.com
- 2a01:111:f403:c901::1 ↩ mail-bl2pr04cu00201.inbound.protection.outlook.com
SOA Record
Raw SOA
ns33.domaincontrol.com dns.jomax.net 2025072401 28800 7200 604800 600
Primary NS (mname)
ns33.domaincontrol.com
Admin Email (rname)
dns@jomax.net
Serial
2025072401
Refresh
28800s
Retry
7200s
Expire
604800s
Minimum TTL
600s
Nameservers (NS)
ns33.domaincontrol.com
ns34.domaincontrol.com
SPF Record
✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; pct=100; fo=1;
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
⚠ No aggregate reports (rua= not set)
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- google-site-verification=y32Ni33Hg59VZc-Vhdmuakb5jdG9lP5wQxwyFgf3lzs
- SPFv=spf1 include:spf.protection.outlook.com -all
- apple-domain-verification=ZeRZ9Vr2IcnlIpdr
- 9rr398rh1aj0rbkfvbumejr83p
- _globalsign-domain-verification=fES-ZkY7z5VAOeqkSqAGtXtSYl4zgvhhBIrj23pa6x
- google-site-verification=GSxTMl4cVDIi4RjnC3WDfnG33bdpvTOozVmepN4hb7A
- adobe-idp-site-verification=8e5ed1b1af9d387499246542bae31f0885ffecdb2cfb3693bdc127af6b948d77
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