Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
cssb-hamburg.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-04-02 16:03:51 UTC · ↺ Refresh
MX Hostnames
- a1721.mx.srv.dfn.de
- c1721.mx.srv.dfn.de
- b1721.mx.srv.dfn.de
MX Priorities
- b1721.mx.srv.dfn.de: 20
- a1721.mx.srv.dfn.de: 20
- c1721.mx.srv.dfn.de: 20
A / AAAA Records
- 131.169.6.162 ↩ cssb.desy.de
Mail Server IPs
- 194.95.234.112 ↩ b1721.mx.srv.dfn.de
- 2001:638:d:c302:acdc:1979:2:56 ↩ b1721.mx.srv.dfn.de
- 194.95.232.112 ↩ a1721.mx.srv.dfn.de
- 2001:638:d:c301:acdc:1979:2:56 ↩ a1721.mx.srv.dfn.de
- 194.95.238.112 ↩ c1721.mx.srv.dfn.de
- 2001:638:d:c303:acdc:1979:2:56 ↩ c1721.mx.srv.dfn.de
SOA Record
Raw SOA
milky.desy.de noc.desy.de 2013017929 21600 3600 604800 600
Primary NS (mname)
milky.desy.de
Admin Email (rname)
noc@desy.de
Serial
2013017929
Refresh
21600s
Retry
3600s
Expire
604800s
Minimum TTL
600s
Nameservers (NS)
milky.desy.de
way.desy.de
SPF Record
✓ Soft Fail (~all)
v=spf1 include:_spf1.desy.de include:_spf2.desy.de ~all
📊 DNS lookups: 2/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
✗ p=none
v=DMARC1; p=none; rua=mailto:[email protected]
⚠ p=none — monitoring only, no enforcement
📋 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
2 records- SPFv=spf1 include:_spf1.desy.de include:_spf2.desy.de ~all
- HARICA-XYz4MWSKBvUNGBodM9N
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 cssb-hamburg.de
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits