hwr-berlin.de

Checked 21 October 2026, 22:51 UTC · via 8.8.8.8
!Passed with warnings
23 passed 2 warnings 0 failed 4 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

dns-2.dfn.de, ns1.hwr-berlin.de, ns2.hwr-berlin.de, ns3.hwr-berlin.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-2.dfn.de, ns1.hwr-berlin.de, ns2.hwr-berlin.de, ns3.hwr-berlin.de
NS in the zone
dns-2.dfn.de, ns1.hwr-berlin.de, ns2.hwr-berlin.de, ns3.hwr-berlin.de
NameserverAddressesNetwork (AS)Glue
dns-2.dfn.de193.174.75.54 2001:638:d:b102::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
ns1.hwr-berlin.de194.94.23.191 2001:638:82e:3100::191AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.94.23.191 2001:638:82e:3100::191
ns2.hwr-berlin.de194.94.23.91 2001:638:82e:3101::91AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.94.23.91 2001:638:82e:3101::91
ns3.hwr-berlin.de194.94.23.183 2001:638:82e:3100::183AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE194.94.23.183 2001:638:82e:3100::183

Checks

  • ✓ 4 nameservers #6
    Delegated to dns-2.dfn.de, ns1.hwr-berlin.de, ns2.hwr-berlin.de, ns3.hwr-berlin.de.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: ns1.hwr-berlin.de, ns2.hwr-berlin.de, ns3.hwr-berlin.de.
  • ✓ 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 2 IPv4 /24s and 2 IPv6 /48s.
  • 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): 8 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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-2.dfn.de 193.174.75.54NOERROR, 7 ms, authoritativenoyes / yesrefused0
dns-2.dfn.de 2001:638:d:b102::1NOERROR, 7 ms, authoritativenoyes / yesrefused0
ns1.hwr-berlin.de 194.94.23.191NOERROR, 19 ms, authoritativenoyes / yesrefused9.20.29-1~deb13u1-Debian
ns1.hwr-berlin.de 2001:638:82e:3100::191NOERROR, 14 ms, authoritativenoyes / yesrefused9.20.29-1~deb13u1-Debian
ns2.hwr-berlin.de 194.94.23.91NOERROR, 22 ms, authoritativenoyes / yesrefused9.20.29-1~deb13u1-Debian
ns2.hwr-berlin.de 2001:638:82e:3101::91NOERROR, 15 ms, authoritativenoyes / yesrefused9.20.29-1~deb13u1-Debian
ns3.hwr-berlin.de 194.94.23.183NOERROR, 21 ms, authoritativenoyes / yesrefused9.20.29-1~deb13u1-Debian
ns3.hwr-berlin.de 2001:638:82e:3100::183NOERROR, 17 ms, authoritativenoyes / yesrefused9.20.29-1~deb13u1-Debian

Checks

  • ✓ All respond #14
    All 8 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: ns1.hwr-berlin.de: "9.20.29-1~deb13u1-Debian"; ns2.hwr-berlin.de: "9.20.29-1~deb13u1-Debian"; ns3.hwr-berlin.de: "9.20.29-1~deb13u1-Debian". 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 2026100900 · primary ns1.hwr-berlin.de

Found

Primary (MNAME)
ns1.hwr-berlin.de
Contact (RNAME)
hostmaster.hwr-berlin.de
Serial
2026100900
Refresh / retry
10800 s / 3600 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns-2.dfn.de (193.174.75.54)2026100900
dns-2.dfn.de (2001:638:d:b102::1)2026100900
ns1.hwr-berlin.de (194.94.23.191)2026100900
ns1.hwr-berlin.de (2001:638:82e:3100::191)2026100900
ns2.hwr-berlin.de (194.94.23.91)2026100900
ns2.hwr-berlin.de (2001:638:82e:3101::91)2026100900
ns3.hwr-berlin.de (194.94.23.183)2026100900
ns3.hwr-berlin.de (2001:638:82e:3100::183)2026100900

Checks

  • ✓ Serial 2026100900 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 14d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.hwr-berlin.de is one of the listed nameservers.
  • ✓ Contact hostmaster@hwr-berlin.de #25
    The SOA RNAME hostmaster.hwr-berlin.de means hostmaster@hwr-berlin.de.
  • ✓ Date-based serial #26
    The serial 2026100900 follows the YYYYMMDDnn convention (2026-10-09).

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

19 records at the apex

Found

Read from
193.174.75.54:53
TypeValueTTL
SOAns1.hwr-berlin.de. hostmaster.hwr-berlin.de. 2026100900 10800 3600 1209600 8640086400
NSdns-2.dfn.de.86400
NSns2.hwr-berlin.de.86400
NSns1.hwr-berlin.de.86400
NSns3.hwr-berlin.de.86400
A194.94.22.20600
MX10 mail01.hwr-berlin.de.86400
MX10 mail02.hwr-berlin.de.86400
TXT"adobe-idp-site-verification=01f99f54eb8469e645bf6f8ccb46275752fef49da64e06b3862ddac841e746a0"86400
TXT"v=spf1 a:bvbvxmail.bib-bvb.de ip4:194.94.23.128/25 ip4:194.94.22.32/27 ip4:77.237.55.139 ip4:188.34.163.246 ip6:2a01:4f8:c010:8fec::1 ?all"86400
TXT"apple-domain-verification=cvdBhUDwmPfgdvfV"86400
TXT"google-site-verification=4FfKJetbx7Tz60cDOOClIukhKibTdSP1ajFqvZBS4So "86400
TXT"ciscocidomainverification=3a9ef866147ef37456827e8193f22eabd2690912184dcecab9e0c9e5c5916ba5"86400
TXT"MS=CF2C93A87A1ADD91983011373F21AE21DC6C14BA"86400
CAA0 issue "pki.dfn.de"86400
CAA0 issue "harica.gr"86400
CAA0 issue "sectigo.com"86400
CAA0 issue "zerossl.com"86400
CAA0 issue "letsencrypt.org"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, MX 1d, 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: pki.dfn.de, harica.gr, sectigo.com, zerossl.com, letsencrypt.org.