wbgu.de

Checked 22 October 2026, 01:00 UTC · via 8.8.8.8
!Passed with warnings
22 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

info

deneb.dfn.de, netu1.awi.de, netu2.awi.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
deneb.dfn.de, netu1.awi.de, netu2.awi.de
NS in the zone
deneb.dfn.de, netu1.awi.de, netu2.awi.de
NameserverAddressesNetwork (AS)Glue
deneb.dfn.de192.76.176.9 2001:638:800:1::9AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
netu1.awi.de134.1.2.251AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE134.1.2.251
netu2.awi.de134.1.13.1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE134.1.13.1

Checks

  • ✓ 3 nameservers #6
    Delegated to deneb.dfn.de, netu1.awi.de, netu2.awi.de.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ No glue needed #8
    All nameservers are outside the zone, so no glue records are needed.
  • ✓ 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 3 IPv4 /24s and 1 IPv6 /48.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 4 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • 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: netu1.awi.de, netu2.awi.de.
    #13

Nameservers

warn

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
deneb.dfn.de 192.76.176.9NOERROR, 14 ms, authoritativenoyes / yesrefused0
deneb.dfn.de 2001:638:800:1::9NOERROR, 14 ms, authoritativenoyes / yesrefused0
netu1.awi.de 134.1.2.251NOERROR, 14 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.22.04.7-Ubuntu
netu2.awi.de 134.1.13.1NOERROR, 14 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.22.04.7-Ubuntu

Checks

  • ✓ All respond #14
    All 4 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: netu1.awi.de: "9.18.39-0ubuntu0.22.04.7-Ubuntu"; netu2.awi.de: "9.18.39-0ubuntu0.22.04.7-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 2026061500 · primary netu1.awi.de

Found

Primary (MNAME)
netu1.awi.de
Contact (RNAME)
hostmaster.awi.de
Serial
2026061500
Refresh / retry
86400 s / 1800 s
Expire
1209600 s
Negative TTL
8400 s

Serial per nameserver

NameserverSerial
deneb.dfn.de (192.76.176.9)2026061500
deneb.dfn.de (2001:638:800:1::9)2026061500
netu1.awi.de (134.1.2.251)2026061500
netu2.awi.de (134.1.13.1)2026061500

Checks

  • ✓ Serial 2026061500 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1d, retry 30m, expire 14d, negative TTL 140m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver netu1.awi.de is one of the listed nameservers.
  • ✓ Contact hostmaster@awi.de #25
    The SOA RNAME hostmaster.awi.de means hostmaster@awi.de.
  • ✓ Date-based serial #26
    The serial 2026061500 follows the YYYYMMDDnn convention (2026-06-15).

DNSSEC

warn

Not signed

Found

Validated by resolver
no

Checks

  • !
    Not signed
    The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.
    #27

Records

pass

14 records at the apex

Found

Read from
192.76.176.9:53
TypeValueTTL
SOAnetu1.awi.de. hostmaster.awi.de. 2026061500 86400 1800 1209600 84001800
NSnetu2.awi.de.1800
NSnetu1.awi.de.1800
NSdeneb.dfn.de.1800
A195.201.0.2321800
MX10 c3061.mx.srv.dfn.de.1800
MX10 b3061.mx.srv.dfn.de.1800
MX10 a3061.mx.srv.dfn.de.1800
TXT"v=spf1 ip4:134.1.2.98 ip4:139.75.1.113 ip4:193.174.240.41 ip4:195.37.138.101 ip4:134.1.2.99 ip4:83.246.78.213 ip4:162.55.92.190 ip4:83.246.78.215 " "mx include:spf.de.umantis.com include:spf.umantis.com include:mailbox.org include:spf.crsend.com include:agenturserver.de include:_spf.s3062.mx.srv.dfn.de -all"1800
TXT"cisco-ci-domain-verification=71cdaabaf861357b4f49378f734a184dea79649b6b9d6ca51c6814b2b90b0130"1800
CAA0 issue "sectigo.com"1800
CAA0 iodef "mailto:pki@awi.de"1800
CAA0 issue "harica.gr"1800
CAA0 issue "letsencrypt.org"1800

Checks

  • ✓ TTLs within range #32
    TTLs: A 30m, MX 30m, NS 30m. The NS TTL at the parent is 1d and in the zone 30m; resolvers may use either.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • ✓ No wildcard #34
    Names that don't exist return NXDOMAIN.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: sectigo.com, harica.gr, letsencrypt.org.