Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
sultan.k12.wa.us
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-27 10:50:30 UTC · ↺ Refresh
MX Hostnames
- sultan-k12-wa-us.mail.protection.outlook.com
MX Priorities
- sultan-k12-wa-us.mail.protection.outlook.com: 0
A / AAAA Records
- 168.99.78.185 ↩ h-168-99-78-185.nwesd.org
- 2607:fa78:1051:101e::b9 (no PTR)
Mail Server IPs
- 52.101.194.15 ↩ mail-ch4pr21cu00107.inbound.protection.outlook.com
- 52.101.41.4 ↩ mail-sj2pr05cu00204.inbound.protection.outlook.com
- 52.101.40.6 ↩ mail-cy1pr03cu00106.inbound.protection.outlook.com
- 52.101.10.2 ↩ mail-bn8pr03cu00202.inbound.protection.outlook.com
- 2a01:111:f403:c92c::3 ↩ mail-dm5pr04cu00103.inbound.protection.outlook.com
- 2a01:111:f403:c803:: ↩ mail-bn1pr21cu00200.inbound.protection.outlook.com
- 2a01:111:f403:c931::1 ↩ mail-sa9pr03cu00201.inbound.protection.outlook.com
- 2a01:111:f403:f905::3 ↩ mail-dm5pr02cu00203.inbound.protection.outlook.com
SOA Record
Raw SOA
ns1.nwesd.org dnsadmin.nwesd.org 2026012901 900 1800 2419200 3600
Primary NS (mname)
ns1.nwesd.org
Admin Email (rname)
dnsadmin@nwesd.org
Serial
2026012901
Refresh
900s
Retry
1800s
Expire
2419200s
Minimum TTL
3600s
Nameservers (NS)
ruler.wa-k20.net
ns1.nwesd.org
apple.wa-k20.net
ns2.nwesd.org
SPF Record
✓ Strict (-all)
v=spf1 include:spf.protection.outlook.com include:sendgrid.net ip4:20.252.34.27 ip4:152.157.6.20 -all
📊 DNS lookups: 2/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; rua=mailto:[email protected]; sp=quarantine; fo=1
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
↳ Subdomain policy: quarantine
DKIM Selectors
✓ 4 found
selector1._domainkey
selector2._domainkey
s1._domainkey
s2._domainkey
✓ Public key: 216 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
3 records- nctpp3fh5r5bs7h7334g3vg7ib
- SPFv=spf1 include:spf.protection.outlook.com include:sendgrid.net ip4:20.252.34.27 ip4:152.157.6.20 -all
- autodesk-domain-verification=_LyLiF0dvhA2k1fYyX8f
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
See demo & docs
Deep verification
Full email verification for sultan.k12.wa.us
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits