fau.de

Checked 21 October 2026, 22:20 UTC · via 8.8.8.8
!Passed with warnings
26 passed 2 warnings 0 failed 5 info

Registration

info

.de country-code

Found

TLD
.de (country-code)
ICANN policies apply
no

Checks

  • i
    .de is a country-code TLD (ccTLD)
    Country-code TLD: governed by its local registry under national policy, not by an ICANN contract. Registrar accreditation, dispute resolution and RDAP/WHOIS rules are set by the registry.
    #1
  • ✓ TLD delegated and signed #2
    .de is delegated in the root zone and DNSSEC-signed.
  • i
    Registration data not available
    No registration data via RDAP: the registry of .de offers no RDAP service. Many ccTLD registries don't offer RDAP; check the registry's WHOIS instead.
    #3

Delegation

warn

dns-3.dfn.de, ns1.rrze.uni-erlangen.de, ns2.rrze.uni-erlangen.de, tuminfo1.informatik.tu-muenchen.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-3.dfn.de, ns1.rrze.uni-erlangen.de, ns2.rrze.uni-erlangen.de, tuminfo1.informatik.tu-muenchen.de
NS in the zone
dns-3.dfn.de, ns1.rrze.uni-erlangen.de, ns2.rrze.uni-erlangen.de, tuminfo1.informatik.tu-muenchen.de
NameserverAddressesNetwork (AS)Glue
dns-3.dfn.de193.174.75.58 2001:638:d:b103::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
ns1.rrze.uni-erlangen.de131.188.3.2 131.188.0.50 2001:638:a000:1055:53::1 2001:638:a000:1001:53::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE131.188.3.2 2001:638:a000:1001:53::1
ns2.rrze.uni-erlangen.de131.188.12.100 2001:638:a000:1054:53::2AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE131.188.12.100 2001:638:a000:1054:53::2
tuminfo1.informatik.tu-muenchen.de131.159.0.1AS209335 TUM-RBG - Technical University of Munich, DE-

Checks

  • ✓ 4 nameservers #6
    Delegated to dns-3.dfn.de, ns1.rrze.uni-erlangen.de, ns2.rrze.uni-erlangen.de, tuminfo1.informatik.tu-muenchen.de.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • !
    Glue differs from the zone
    The addresses at the parent (glue) differ from the addresses in the zone: ns1.rrze.uni-erlangen.de (glue 131.188.3.2, 2001:638:a000:1001:53::1, zone 131.188.3.2, 131.188.0.50, 2001:638:a000:1055:53::1, 2001:638:a000:1001:53::1). Update the glue at your registrar.
    #8
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • ✓ Nameservers in different networks #10
    The nameservers are spread over 5 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS209335 (TUM-RBG - Technical University of Munich, DE): 1 address; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 8 addresses.
  • i
    All nameserver names under .de
    All nameserver names are under one TLD, so a problem with that TLD also makes the nameservers unreachable. Some operators use names under two TLDs for extra resilience.
    #12
  • i
    Partly IPv6
    These nameservers have no IPv6 address: tuminfo1.informatik.tu-muenchen.de.
    #13

Nameservers

warn

9 of 9 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-3.dfn.de 193.174.75.58NOERROR, 8 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 2001:638:d:b103::1NOERROR, 10 ms, authoritativenoyes / yesrefused0
ns1.rrze.uni-erlangen.de 131.188.3.2NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns1.rrze.uni-erlangen.de 131.188.0.50NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns1.rrze.uni-erlangen.de 2001:638:a000:1055:53::1NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns1.rrze.uni-erlangen.de 2001:638:a000:1001:53::1NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns2.rrze.uni-erlangen.de 131.188.12.100NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns2.rrze.uni-erlangen.de 2001:638:a000:1054:53::2NOERROR, 7 ms, authoritativenoyes / yesrefused-
tuminfo1.informatik.tu-muenchen.de 131.159.0.1NOERROR, 12 ms, authoritativenoyes / yesrefused9.10.3-P4-Ubuntu

Checks

  • ✓ All respond #14
    All 9 nameserver addresses answered.
  • ✓ All authoritative #15
    Every responding nameserver answers authoritatively for the zone.
  • ✓ No recursion #16
    The nameservers do not answer recursive queries for other domains.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: tuminfo1.informatik.tu-muenchen.de: "9.10.3-P4-Ubuntu". Hide or replace the version string.
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✓ TCP supported #19
    All nameservers answer over TCP.
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 1792588218 · primary ns1.rrze.uni-erlangen.de

Found

Primary (MNAME)
ns1.rrze.uni-erlangen.de
Contact (RNAME)
hostmaster.rrze.uni-erlangen.de
Serial
1792588218
Refresh / retry
10800 s / 1800 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
dns-3.dfn.de (193.174.75.58)1792588218
dns-3.dfn.de (2001:638:d:b103::1)1792588218
ns1.rrze.uni-erlangen.de (131.188.3.2)1792588218
ns1.rrze.uni-erlangen.de (131.188.0.50)1792588218
ns1.rrze.uni-erlangen.de (2001:638:a000:1055:53::1)1792588218
ns1.rrze.uni-erlangen.de (2001:638:a000:1001:53::1)1792588218
ns2.rrze.uni-erlangen.de (131.188.12.100)1792588218
ns2.rrze.uni-erlangen.de (2001:638:a000:1054:53::2)1792588218
tuminfo1.informatik.tu-muenchen.de (131.159.0.1)1792588218

Checks

  • ✓ Serial 1792588218 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 30m, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.rrze.uni-erlangen.de is one of the listed nameservers.
  • ✓ Contact hostmaster@rrze.uni-erlangen.de #25
    The SOA RNAME hostmaster.rrze.uni-erlangen.de means hostmaster@rrze.uni-erlangen.de.
  • ✓ Timestamp serial #26
    The serial 1792588218 is a Unix timestamp (2026-10-21 13:10 UTC).

DNSSEC

pass

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC3
NSEC3
0 iterations, 0-byte salt
Signatures valid until
31 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
11405RSASHA256 (8)SHA256 000258C3296D7020…yes

DNSKEY in the zone

Key tagRoleAlgorithm
11405KSK (257)RSASHA256 (8)
52153ZSK (256)RSASHA256 (8)

Checks

  • ✓ Signed and validated #27
    The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
  • ✓ DS matches a key #28
    The DS record at the parent matches a key in the zone: key tag 11405 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: RSASHA256 (8).
  • ✓ Signatures valid until 2026-10-31 #30
    The earliest DNSKEY/SOA signature expires at 2026-10-31 11:25 UTC.
  • ✓ NSEC3 as recommended #31
    The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

info

17 records at the apex

Found

Read from
193.174.75.58:53
TypeValueTTL
SOAns1.rrze.uni-erlangen.de. hostmaster.rrze.uni-erlangen.de. 1792588218 10800 1800 1209600 360086400
NSns2.rrze.uni-erlangen.de.86400
NSns1.rrze.uni-erlangen.de.86400
NStuminfo1.informatik.tu-muenchen.de.86400
NSdns-3.dfn.de.86400
A131.188.16.2121800
AAAA2001:638:a000:1080::2121800
MX10 mx-rz-3.rrze.uni-erlangen.de.3600
MX10 mx-rz-2.rrze.uni-erlangen.de.3600
MX10 mx-rz-1.rrze.uni-erlangen.de.3600
TXT"apple-domain-verification=Njg7uB590BxDg7GY"86400
TXT"v=spf1 mx ip4:131.188.11.0/26 ip6:2001:638:a000:1025::/64 ?all"86400
TXT"cisco-ci-domain-verification=1888fbd399b82bd6aa087c80cf54b22f5e5b7490738ddaf2340c06b2803241c9"86400
TXT"ZOOM_verify_cVNffc5ySfa38XF-fExACg"86400
TXT"MS=45B424E57115B1C0DEA71482679797E8CEA7726F"86400
TXT"dell-technologies-domain-verification=fau.de_c584ce10-73c9-4ce6-8675-ae3f46801f39_1718440579"86400
TXT"google-site-verification=XyepOLNPRCHyobplPnGF0e9O-LklVAvV35UxSLPkb2k"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 30m, AAAA 30m, MX 1h, NS 1d.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • ✓ No wildcard #34
    Names that don't exist return NXDOMAIN.
  • i
    No CAA records
    Without CAA records any certificate authority may issue certificates for this domain. A CAA record limits issuance to the CAs you use.
    #35