Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
holbertonschool.com
Yes
✓ Yes
Google
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-27 05:47:20 UTC · ↺ Refresh
MX Hostnames
- alt1.aspmx.l.google.com
- alt2.aspmx.l.google.com
- alt3.aspmx.l.google.com
- alt4.aspmx.l.google.com
- aspmx.l.google.com
MX Priorities
- alt3.aspmx.l.google.com: 10
- alt4.aspmx.l.google.com: 10
- alt1.aspmx.l.google.com: 5
- alt2.aspmx.l.google.com: 5
- aspmx.l.google.com: 1
A / AAAA Records
- 198.202.211.1
Mail Server IPs
- 192.178.223.27 ↩ yulhrs-in-f27.1e100.net
- 2a00:1450:4009:c0f::1b ↩ yulhrs-in-f27.1e100.net
- 173.194.76.27 ↩ ws-in-f27.1e100.net
- 2a00:1450:400c:c00::1a ↩ ws-in-x1a.1e100.net
- 108.177.123.27 ↩ lcscld-in-f27.1e100.net
- 2800:3f0:4003:c0f::1b (no PTR)
- 172.253.116.26 ↩ dj-in-f26.1e100.net
- 2a00:1450:400b:c02::1b ↩ dj-in-f27.1e100.net
- 142.251.179.27 ↩ pd-in-f27.1e100.net
- 2607:f8b0:4004:c07::1b ↩ bc-in-f27.1e100.net
SOA Record
Raw SOA
ns-957.awsdns-55.net awsdns-hostmaster.amazon.com 1 7200 900 1209600 86400
Primary NS (mname)
ns-957.awsdns-55.net
Admin Email (rname)
awsdns-hostmaster@amazon.com
Serial
1
Refresh
7200s
Retry
900s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
ns-957.awsdns-55.net
ns-1244.awsdns-27.org
ns-1991.awsdns-56.co.uk
ns-343.awsdns-42.com
SPF Record
✓ Strict (-all)
v=spf1 include:mailgun.org include:_spf.google.com -all
📊 DNS lookups: 2/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ p=none
v=DMARC1; p=none;rua=mailto:[email protected]
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 4 found
google._domainkey
k1._domainkey
s1._domainkey
s2._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: google
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
9 records- loaderio=67a0fbf5fb42755902d5415639d826a6
- stripe-verification=e0f957fde60d97f6fd922d8599916a296577b25f28fa1e4caa0730a6b2832eed
- SPFv=spf1 include:mailgun.org include:_spf.google.com -all
- zapier-domain-verification-challenge=20fd6ef9-5b6e-48c8-bb95-a24a7fb61ec4
- 1C8BC5F558
- MS=BB8A869E4E8A47D208F560DE7D83F199D1BB8F4F
- brevo-code:32c00935278b2f59e44fec877e96af37
- google-site-verification=lnffgexG_GGal6Fa53z0Ve4dJY4z4GXAmy1I2_ldotk
- intacct-esk=A3E9DCEA8FB6B747E0539A220D0A9719
Full email verification for holbertonschool.com
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