koenig-immobilien.de

Valid Email Server
Domain Lookup › koenig-immobilien.de

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
koenig-immobilien.de
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-03-18 04:19:11 UTC · ↺ Refresh

MX Hostnames

  • mx2.onoffice.de
  • mx1.onoffice.de
  • mx3.onoffice.de
  • koenigimmobilien-de01e.mail.protection.outlook.com

MX Priorities

  • koenigimmobilien-de01e.mail.protection.outlook.com: 0
  • mx1.onoffice.de: 10
  • mx2.onoffice.de: 10
  • mx3.onoffice.de: 20

A / AAAA Records

  • 104.20.27.124
  • 172.66.144.158
  • 2606:4700:10::ac42:909e
  • 2606:4700:10::6814:1b7c

Mail Server IPs

  • 52.101.170.1 ↩ mail-fr4p281cu03101.inbound.protection.outlook.com
  • 52.101.170.2 ↩ mail-fr6p281cu00202.inbound.protection.outlook.com
  • 52.101.168.0 ↩ mail-beup281cu00100.inbound.protection.outlook.com
  • 52.101.170.0 ↩ mail-fr5p281cu00500.inbound.protection.outlook.com
  • 2a01:111:f403:ca2d::2 ↩ mail-fr6p281cu00202.inbound.protection.outlook.com
  • 2a01:111:f403:ca2d::1 ↩ mail-fr4p281cu03101.inbound.protection.outlook.com
  • 2a01:111:f403:ca27:: ↩ mail-beup281cu00100.inbound.protection.outlook.com
  • 2a01:111:f403:ca2d:: ↩ mail-fr5p281cu00500.inbound.protection.outlook.com
  • 95.130.253.60 ↩ mx1.onoffice.de
  • 95.130.253.71 ↩ mx2.onoffice.de
  • 95.130.253.56

SOA Record

Raw SOA eleanor.ns.cloudflare.com dns.cloudflare.com 2396889077 10000 2400 604800 1800
Primary NS (mname)
eleanor.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2396889077
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s

Nameservers (NS)

lou.ns.cloudflare.com
eleanor.ns.cloudflare.com

SPF Record

✓ Strict (-all)
v=spf1 mx include:ispgateway.de include:onoffice.de include:spf.protection.outlook.com -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

✗ Missing

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

DKIM Selectors

✗ None detected

No DKIM records found for common selectors — your provider may use a custom selector name.

Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses

All TXT Records

3 records
  • MS=ms16642577
  • google-site-verification=NtrwHORRztyeQjvFzXYnBwjTfgrcKIE8ZSlxuO7rrlc
  • SPFv=spf1 mx include:ispgateway.de include:onoffice.de include:spf.protection.outlook.com -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 koenig-immobilien.de

SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.

No credit card required
Get 1,000 Free Credits