Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
a2bcontabil.com.br
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-04-06 14:02:41 UTC · ↺ Refresh
MX Hostnames
- a2bcontabil.com.br
MX Priorities
- a2bcontabil.com.br: 0
A / AAAA Records
- 189.113.174.100 ↩ 100.todobh.com.br
Mail Server IPs
- 189.113.174.100 ↩ 100.todobh.com.br
SOA Record
Raw SOA
ns1.todobh.com.br suporte.construsitebrasil.com.br 2026021201 3600 1800 1209600 86400
Primary NS (mname)
ns1.todobh.com.br
Admin Email (rname)
suporte@construsitebrasil.com.br
Serial
2026021201
Refresh
3600s
Retry
1800s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
ns2.todobh.com.br
ns1.todobh.com.br
SPF Record
✓ Strict (-all)
v=spf1 ip4:189.113.174.96 ip4:189.113.174.100 +a +mx +ip4:189.113.174.100 +ip4:189.113.175.233 +ip4:189.113.174.94 +ip4:189.113.160.0/20 +ip4:23.83.208.0/20 +a:shark.todobh.com.br +include:relay.mailchannels.net -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ MissingNo DMARC record — emails cannot be rejected on auth failure.
DKIM Selectors
✓ 1 found
default._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: default
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
1 record- SPFv=spf1 ip4:189.113.174.96 ip4:189.113.174.100 +a +mx +ip4:189.113.174.100 +ip4:189.113.175.233 +ip4:189.113.174.94 +ip4:189.113.160.0/20 +ip4:23.83.208.0/20 +a:shark.todobh.com.br +include:relay.mailchannels.net -all
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