Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
b1-systems.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-25 01:25:37 UTC · ↺ Refresh
MX Hostnames
- mx2.b1-systems.de
- mx4.b1-systems.de
- mx1.b1-systems.de
MX Priorities
- mx2.b1-systems.de: 15
- mx4.b1-systems.de: 10
- mx1.b1-systems.de: 15
A / AAAA Records
- 159.69.135.54 ↩ lb.b1-systems.de
Mail Server IPs
- 159.69.135.53 ↩ mx2.b1-systems.de
- 159.69.135.43 ↩ mx4.b1-systems.de
- 159.69.135.40 ↩ mx1.b1-systems.de
SOA Record
Raw SOA
ns-1714.awsdns-22.co.uk awsdns-hostmaster.amazon.com 1 7200 900 1209600 86400
Primary NS (mname)
ns-1714.awsdns-22.co.uk
Admin Email (rname)
awsdns-hostmaster@amazon.com
Serial
1
Refresh
7200s
Retry
900s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
ns-1110.awsdns-10.org
ns-1714.awsdns-22.co.uk
ns-333.awsdns-41.com
ns-997.awsdns-60.net
SPF Record
✓ Strict (-all)
v=spf1 mx ip4:148.251.65.236/32 ip4:159.69.135.52/32 ip4:188.40.228.38/32 -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
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
6 records- SPFv=spf1 mx ip4:148.251.65.236/32 ip4:159.69.135.52/32 ip4:188.40.228.38/32 -all
- DirectFedAuthUrl=https://b1systems.keycloak.testing.b1-systems.de/realms/b1systems/protocol/saml
- MS=7D06157864DDE1843B19435B309D1B250C6B466D
- have-i-been-pwned-verification=d223c63bfe4750231d2dc3c85bb60d01
- spf2.0/pra
- DMARCv=DMARC1; p=none; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1
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