certa-web.com

Valid Email Server
Domain Lookup › certa-web.com
Live data — DNS records and disposable check were just fetched and saved.

Domain Overview

DNS: ⚡ live Checker: ⚡ live
certa-web.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-06-09 11:59:44 UTC · ↺ Refresh

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MX Hostnames

  • certaweb-com01c.mail.protection.outlook.com

MX Priorities

  • certaweb-com01c.mail.protection.outlook.com: 0

A / AAAA Records

  • 77.247.77.143 ↩ vps138.rackhosting.com

Mail Server IPs

  • 52.101.73.16 ↩ mail-as2pr05cu00100.inbound.protection.outlook.com
  • 52.101.68.15 ↩ mail-db6pr03cu00107.inbound.protection.outlook.com
  • 52.101.68.12 ↩ mail-db9pr02cu00204.inbound.protection.outlook.com
  • 52.101.68.3 ↩ mail-db7pr03cu00403.inbound.protection.outlook.com
  • 2a01:111:f403:ca04::d ↩ mail-db6pr03cu00105.inbound.protection.outlook.com
  • 2a01:111:f403:ca09::6 ↩ mail-am4pr0401cu00106.inbound.protection.outlook.com
  • 2a01:111:f403:ca04::f ↩ mail-db7pr03cu00507.inbound.protection.outlook.com
  • 2a01:111:f403:ca09::c ↩ mail-as8pr05cu00304.inbound.protection.outlook.com

SOA Record

Raw SOA mario.ns.cloudflare.com dns.cloudflare.com 2406296813 10000 2400 604800 1800
Primary NS (mname)
mario.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2406296813
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s

Nameservers (NS)

mario.ns.cloudflare.com
molly.ns.cloudflare.com

SPF Record

✓ Strict (-all)
v=spf1 mx ip4:77.247.73.192/26 ip4:77.247.78.3 a:certa-web.com a:sundhus.dk include:spf.protection.outlook.com include:mailmailmail.net -all
📊 DNS lookups: 5/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

✗ Missing

No DMARC record — emails cannot be rejected on auth failure.

DKIM Selectors

✓ 1 found
default._domainkey
✓ Public key: 216 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

2 records
  • SPFv=spf1 mx ip4:77.247.73.192/26 ip4:77.247.78.3 a:certa-web.com a:sundhus.dk include:spf.protection.outlook.com include:mailmailmail.net -all
  • MS=ms17924053
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