uni-duesseldorf.de

Valid Email Server
Domain Lookup › uni-duesseldorf.de

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
uni-duesseldorf.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No

Checked via [email protected] · 2026-04-01 14:22:00 UTC · ↺ Refresh

MX Hostnames

  • b2881.mx.srv.dfn.de
  • a2881.mx.srv.dfn.de
  • c2881.mx.srv.dfn.de

MX Priorities

  • c2881.mx.srv.dfn.de: 10
  • b2881.mx.srv.dfn.de: 10
  • a2881.mx.srv.dfn.de: 10

A / AAAA Records

  • 134.99.128.238 ↩ www.hhu.de

Mail Server IPs

  • 194.95.239.77 ↩ c2881.mx.srv.dfn.de
  • 194.95.235.77 ↩ b2881.mx.srv.dfn.de
  • 194.95.233.77 ↩ a2881.mx.srv.dfn.de

SOA Record

Raw SOA sirene.rz.uni-duesseldorf.de hostmaster.uni-duesseldorf.de 2026032701 3600 600 1814400 3600
Primary NS (mname)
sirene.rz.uni-duesseldorf.de
Admin Email (rname)
hostmaster@uni-duesseldorf.de
Serial
2026032701
Refresh
3600s
Retry
600s
Expire
1814400s
Minimum TTL
3600s

Nameservers (NS)

dns-1.dfn.de
sirene.rz.uni-duesseldorf.de
dns-2.dfn.de
selene.rz.uni-duesseldorf.de
dns-3.dfn.de

SPF Record

✓ Strict (-all)
v=spf1 ip4:134.99.18.0/24 ip4:134.99.128.0/24 ip4:134.99.108.0/27 ip4:134.99.108.128/27 include:spf.qb-feedback.com include:_spf.o288.mx.srv.dfn.de -all
📊 DNS lookups: 3/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

✗ p=none
v=DMARC1;p=none;sp=quarantine;pct=100;rua=mailto:[email protected];ruf=mailto:[email protected];aspf=r
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed · DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
↳ Subdomain policy: quarantine

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

8 records
  • [email protected]
  • HARICA-bCYMh0SDGtswzHtocY7
  • google-site-verification=DXljWnX7rdU4M0eVZpbohHsXbc8q8VEP4GdNoPwL5yE
  • cisco-ci-domain-verification=4a60e9dddacd024a7029731869b6259bfb32e550f5004eb699afadf7d558cbf
  • adobe-idpfzim.-site-verification=18ec973e322894c7c0c11b75d7434eb7c4a5b8d2f164b30a6d47f928c7b5f811
  • SPFv=spf1 ip4:134.99.18.0/24 ip4:134.99.128.0/24 ip4:134.99.108.0/27 ip4:134.99.108.128/27 include:spf.qb-feedback.com include:_spf.o288.mx.srv.dfn.de -all
  • security_policy=https://www.hhu.de/it-sicherheit
  • Q181-R920-S212
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