Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
nsbrazil.com.br
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-04-03 05:32:26 UTC · ↺ Refresh
MX Hostnames
- smtpvin1.f1.k8.com.br
MX Priorities
- smtpvin1.f1.k8.com.br: 10
A / AAAA Records
- 45.55.107.236 (no PTR)
- 104.156.247.183 ↩ 104.156.247.183.vultrusercontent.com
- 108.61.89.136 ↩ 108.61.89.136.vultrusercontent.com
- 2604:a880:400:d0::1a3d:e001 (no PTR)
- 2001:19f0:5:39fb:5400:4ff:fe7c:e4cc (no PTR)
- 2001:19f0:9002:1b90:5400:4ff:fe7c:e525 (no PTR)
Mail Server IPs
- 187.73.32.162 ↩ smtpvin1.f1.k8.com.br
SOA Record
Raw SOA
nsb1.hostnet.com.br dnsmasters.k8.com.br 212 3600 300 604800 3600
Primary NS (mname)
nsb1.hostnet.com.br
Admin Email (rname)
dnsmasters@k8.com.br
Serial
212
Refresh
3600s
Retry
300s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
nsb1.hostnet.com.br
nsb2.hostnet.com.br
nsb3.hostnet.com.br
nsb4.hostnet.com.br
nsb5.hostnet.com.br
nsb6.hostnet.com.br
SPF Record
✓ Strict (-all)
v=spf1 a:mxv.f1.k8.com.br -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject;
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
⚠ No aggregate reports (rua= not set)
DKIM Selectors
✓ 2 found
s1._domainkey
s2._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: s1
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
1 record- SPFv=spf1 a:mxv.f1.k8.com.br -all
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 nsbrazil.com.br
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits