Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
smart-numbers.net
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-18 04:23:33 UTC · ↺ Refresh
MX Hostnames
- smartnumbers-net01c.mail.protection.outlook.com
MX Priorities
- smartnumbers-net01c.mail.protection.outlook.com: 10
A / AAAA Records
- 91.204.209.63 ↩ libra.premium.hostns.io
Mail Server IPs
- 52.101.68.3 ↩ mail-db7pr03cu00403.inbound.protection.outlook.com
- 52.101.73.19 ↩ mail-as8pr04cu00803.inbound.protection.outlook.com
- 52.101.68.5 ↩ mail-du2pr03cu00105.inbound.protection.outlook.com
- 52.101.68.25 ↩ mail-db8pr02cu00101.inbound.protection.outlook.com
- 2a01:111:f403:ca09::c ↩ mail-as8pr05cu00304.inbound.protection.outlook.com
- 2a01:111:f403:ca04::f ↩ mail-db7pr03cu00507.inbound.protection.outlook.com
- 2a01:111:f403:ca04::5 ↩ mail-db3pr0202cu00205.inbound.protection.outlook.com
- 2a01:111:f403:ca09::8 ↩ mail-as2pr05cu00100.inbound.protection.outlook.com
SOA Record
Raw SOA
ns1.premium.hostns.io alerting.hostns.io 2026031803 3600 7200 1209600 86400
Primary NS (mname)
ns1.premium.hostns.io
Admin Email (rname)
alerting@hostns.io
Serial
2026031803
Refresh
3600s
Retry
7200s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
ns1.premium.hostns.io
ns2.premium.hostns.io
SPF Record
✓ Strict (-all)
v=spf1 ip4:91.204.209.63 ip4:109.70.148.152 ip4:195.206.182.226 include:spf.protection.outlook.com ip4:149.72.63.27 ip4:54.240.11.171 ip4:145.239.255.195 ip4:142.0.176.0/20 ip4:207.246.239.0/26 include:smartnumbers.callstats.info include:mailgun.org ip4:213.38.252.1/24 ip4:213.38.252.1/24 ip4:142.0.177.81 include:eu._netblocks.mimecast.com ip4:62.25.77.55 include:143641449.spf06.hubspotemail.net ip4:51.140.37.132 ip4:51.141.5.228 ip4:34.136.128.116 include:spf.hostns.io ip4:151.2.232.242 -all
📊 DNS lookups: 6/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ p=none
v=DMARC1;p=none;sp=none;adkim=r;aspf=r;pct=100;fo=1;rf=afrf;ri=86400;rua=mailto:[email protected];ruf=mailto:[email protected]
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
↳ Subdomain policy: none
DKIM Selectors
✓ 6 found
selector1._domainkey
selector2._domainkey
default._domainkey
mail._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
6 records- MS=ms52850379
- v=verifydomain MS=4528480
- SPFv=spf1 ip4:91.204.209.63 ip4:109.70.148.152 ip4:195.206.182.226 include:spf.protection.outlook.com ip4:149.72.63.27 ip4:54.240.11.171 ip4:145.239.255.195 ip4:142.0.176.0/20 ip4:207.246.239.0/26 include:smartnumbers.callstats.info include:mailgun.org ip4:213.38.252.1/24 ip4:213.38.252.1/24 ip4:142.0.177.81 include:eu._netblocks.mimecast.com ip4:62.25.77.55 include:143641449.spf06.hubspotemail.net ip4:51.140.37.132 ip4:51.141.5.228 ip4:34.136.128.116 include:spf.hostns.io ip4:151.2.232.242 -all
- klaviyo-site-verification=YbCHBM
- nordpass-domain-verification=1cc8e8e4409f45bb95c4952d816c98be
- 32404.sbc1.invosip.uk
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 smart-numbers.net
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits