Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
math.uos.de
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-04-02 17:48:42 UTC · ↺ Refresh
MX Hostnames
- c2411.mx.srv.dfn.de
- b2411.mx.srv.dfn.de
- a2411.mx.srv.dfn.de
MX Priorities
- c2411.mx.srv.dfn.de: 60
- a2411.mx.srv.dfn.de: 60
- b2411.mx.srv.dfn.de: 60
A / AAAA Records
- 131.173.17.203 ↩ t3prod4g.rz.uni-osnabrueck.de
- 2001:638:508:100::83ad:11cb ↩ t3prod4g.rz.uni-osnabrueck.de
CNAME → math.uni-osnabrueck.de
Mail Server IPs
- 194.95.238.204 ↩ c2411.mx.srv.dfn.de
- 2001:638:d:c303:acdc:1979:2:b2 ↩ c2411.mx.srv.dfn.de
- 194.95.232.204 ↩ a2411.mx.srv.dfn.de
- 2001:638:d:c301:acdc:1979:2:b2 ↩ a2411.mx.srv.dfn.de
- 194.95.234.204 ↩ b2411.mx.srv.dfn.de
- 2001:638:d:c302:acdc:1979:2:b2 ↩ b2411.mx.srv.dfn.de
SOA Record
Raw SOA
dns-1.serv.uni-osnabrueck.de dnsadmin.uni-osnabrueck.de 767896873 3602 1802 1209600 1202
Primary NS (mname)
dns-1.serv.uni-osnabrueck.de
Admin Email (rname)
dnsadmin@uni-osnabrueck.de
Serial
767896873
Refresh
3602s
Retry
1802s
Expire
1209600s
Minimum TTL
1202s
Nameservers (NS)
dns-1.serv.uni-osnabrueck.de
dns-2.serv.uni-osnabrueck.de
dns-3.serv.uni-osnabrueck.de
SPF Record
✓ Soft Fail (~all)
v=spf1 redirect=uni-osnabrueck.de
📊 DNS lookups: 1/10
DMARC Record
✗ MissingNo DMARC record — emails cannot be rejected on auth failure.
DKIM Selectors
✓ 13 found
google._domainkey
selector1._domainkey
selector2._domainkey
default._domainkey
mail._domainkey
dkim._domainkey
k1._domainkey
s1._domainkey
s2._domainkey
zoho._domainkey
sendgrid._domainkey
mxvault._domainkey
amazonses._domainkey
✓ DKIM properly configured for selector: google
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
1 record- SPFv=spf1 redirect=uni-osnabrueck.de
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