dart.biz

Valid Email Server
Domain Lookup › dart.biz

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
dart.biz
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Did you mean: [email protected]

Checked via [email protected] · 2026-03-21 02:49:15 UTC · ↺ Refresh

Add email validation to your forms — free

Add our free script to block 10,000+ disposable domains + perform other checks. No signup, unlimited checks.

MX validation Disposable detection Role accounts
Add to your signup form
<script src="https://check.verifyswift.com/"></script>
One line · No registration · See full docs & demo → · Customize →

MX Hostnames

  • dart-biz.mail.protection.outlook.com

MX Priorities

  • dart-biz.mail.protection.outlook.com: 10

A / AAAA Records

  • 23.101.169.175 (no PTR)

Mail Server IPs

  • 52.101.41.24 ↩ mail-sj0pr03cu01600.inbound.protection.outlook.com
  • 52.101.41.3 ↩ mail-sj2pr05cu00103.inbound.protection.outlook.com
  • 52.101.9.11 ↩ mail-bl2pr04cu00103.inbound.protection.outlook.com
  • 52.101.8.46 ↩ mail-dm6pr05cu00406.inbound.protection.outlook.com
  • 2a01:111:f403:c902::16 ↩ mail-byapr04cu00306.inbound.protection.outlook.com
  • 2a01:111:f403:f802::2 ↩ mail-sj2pr05cu00202.inbound.protection.outlook.com
  • 2a01:111:f403:f90c:: ↩ mail-sn1pr03cu00100.inbound.protection.outlook.com
  • 2a01:111:f403:c801:: ↩ mail-sa9pr02cu00200.inbound.protection.outlook.com

SOA Record

Raw SOA ns1-09.azure-dns.com azuredns-hostmaster.microsoft.com 1 3600 300 2419200 300
Primary NS (mname)
ns1-09.azure-dns.com
Admin Email (rname)
azuredns-hostmaster@microsoft.com
Serial
1
Refresh
3600s
Retry
300s
Expire
2419200s
Minimum TTL
300s

Nameservers (NS)

ns3-09.azure-dns.org
ns4-09.azure-dns.info
ns1-09.azure-dns.com
ns2-09.azure-dns.net

SPF Record

✓ Soft Fail (~all)
v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email include:mailgun.org ~all
📊 DNS lookups: 2/10
~ Soft fail (~all) — moderate enforcement

DMARC Record

✓ Reject
v=DMARC1; p=reject; sp=reject; rua=mailto:[email protected],mailto:[email protected]; ruf=mailto:[email protected]; rf=afrf; ri=86400
✓ Reject — strongest protection
📋 SPF alignment: Relaxed · DKIM alignment: Relaxed
📧 Reports → mailto:[email protected],mailto:[email protected]
↳ Subdomain policy: reject

DKIM Selectors

✓ 5 found
selector1._domainkey
selector2._domainkey
k1._domainkey
s1._domainkey
s2._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

12 records
  • cisco-ci-domain-verification=4a324626f461a34a57f97724b823d3901dfc6e27296d74cb3abc990209e905a3
  • MS=ms61549714
  • UUrGt7cZNyPeQPQKUf89QUOYHWC8uVPzXePWp5RmneJZUetFWXhcbbhcGodxsyELgBlsHaobpy5hTsw6SXHvXQ==
  • dropbox-domain-verification=fdzlf9s8nn5p
  • 1iOIVyWxKfeYsmP45KH1MduTT2i4zNMe6YxnTMliI5zfRe3G7HnkfYDXp4pwUNf8OdmQ0Zq9N7uxZhZP/Ipc5A==
  • google-site-verification=J_zHv8OkFAXiLtjKJHY7jD2AWTtMi_NigX1RrJS8U4U
  • autodesk-domain-verification=qfU4kMRUKpXk6JiXIMst
  • apple-domain-verification=F7zpKlSkytxkx2f6
  • atlassian-domain-verification=cUIO0vE8Rn7hatmPmBPTC0wSsjicAhzRXksUX4wLJ2sxvDFg6sSAbSP3PMv+Iu9z
  • SPFv=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email include:mailgun.org ~all
  • jamf-site-verification=bowJ22MR6s2vgozJL-Mptg
  • remarkable-domain-verification=c76dd38b-e6e7-4926-8506-a9119949f7c2
Free · No signup required
Add email validation to your forms

Block disposable emails, validate MX records, detect role accounts — unlimited, forever free.

<script src="https://check.verifyswift.com/"></script>
One line of code · Works on any site · Customize →
See demo & docs
Deep verification
Full email verification for dart.biz

SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.

No credit card required
Get 1,000 Free Credits