SurfaceMap › u › uni-mannheim.de

uni-mannheim.de

Checked 2026-10-22 00:50 UTC · first added 2026-10-21
✗Problems found Score 72 of 100

Domain & DNS

warn

25 passed 3 warn 0 failed

Areas

iRegistration !Delegation !Nameservers iSOA !DNSSEC ✓Records

Problems

  • !
    Nameservers in one network
    Delegation · all IPv4 addresses are in 134.155.96.0/24; all IPv6 addresses are in 2001:7c0:2900::/48. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).
    #10
  • !
    Software version disclosed
    Nameservers · These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: dns1.uni-mannheim.de: "9.20.29-1~deb13u1-Debian"; dns2.uni-mannheim.de: "9.20.29-1~deb13u1-Debian"; dns3.uni-mannheim.de: "9.20.29-1~deb13u1-Debian". Hide or replace the version string.
    #17
  • !
    NSEC3 with extra iterations or salt
    DNSSEC · NSEC3 uses 0 iterations and a 8-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.
    #31

Recent checks

!

Full report

Domain & DNS report for uni-mannheim.de ›

Mail

fail

23 passed 3 warn 1 failed

Areas

✓SPF ✗DMARC !DKIM ✓DNSSEC ✓MX !TLS iBIMI

Problems

  • ✗
    Policy: none (monitoring only)
    DMARC · DMARC policy is set to 'none', which only monitors but doesn't protect against spoofing. Consider upgrading to 'quarantine' or ideally 'reject'.
    #4
  • !
    No aggregate reports (rua)
    DMARC · DMARC record has no rua tag, so you receive no aggregate reports about who sends mail as your domain. Add rua=mailto:...
    #19
  • !
    1024-bit DKIM key
    DKIM · 1024-bit RSA keys are the minimum and are considered weak today: selector1 (1024 bits). Rotate to a 2048-bit key.
    #23
  • !
    Not configured
    TLS · MTA-STS is not configured, so other mail servers fall back to unencrypted delivery when TLS fails or is stripped by an attacker. Publish a _mta-sts TXT record and a policy at https://mta-sts.<domain>/.well-known/mta-sts.txt.
    #32

Recent checks

✗

Full report

Mail report for uni-mannheim.de ›