fu-berlin.de

Checked 21 October 2026, 22:31 UTC · via 8.8.8.8
!Passed with warnings
24 passed 2 warnings 0 failed 3 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

atalante.stanford.edu, dns-2.dfn.de, ns1.fu-berlin.de, ns2.fu-berlin.de, ns3.fu-berlin.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
atalante.stanford.edu, dns-2.dfn.de, ns1.fu-berlin.de, ns2.fu-berlin.de, ns3.fu-berlin.de
NS in the zone
atalante.stanford.edu, dns-2.dfn.de, ns1.fu-berlin.de, ns2.fu-berlin.de, ns3.fu-berlin.de
NameserverAddressesNetwork (AS)Glue
atalante.stanford.edu171.64.7.61 2607:f6d0:0:d32::ab40:73dAS32 STANFORD - Stanford University, US AS32 STANFORD - Stanford University, US-
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.fu-berlin.de160.45.8.8AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE160.45.8.8
ns2.fu-berlin.de160.45.10.12AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE160.45.10.12
ns3.fu-berlin.de130.133.1.57AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE130.133.1.57

Checks

  • ✓ 5 nameservers #6
    Delegated to atalante.stanford.edu, dns-2.dfn.de, ns1.fu-berlin.de, ns2.fu-berlin.de, ns3.fu-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.fu-berlin.de, ns2.fu-berlin.de, ns3.fu-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 5 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS32 (STANFORD - Stanford University, US): 2 addresses; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 5 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .edu.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns1.fu-berlin.de, ns2.fu-berlin.de, ns3.fu-berlin.de.
    #13

Nameservers

warn

7 of 7 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
atalante.stanford.edu 171.64.7.61NOERROR, 149 ms, authoritativenoyes / yesrefused9.20.22
atalante.stanford.edu 2607:f6d0:0:d32::ab40:73dNOERROR, 171 ms, authoritativenoyes / yesrefused9.20.22
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.fu-berlin.de 160.45.8.8NOERROR, 14 ms, authoritativenoyes / yesrefused-
ns2.fu-berlin.de 160.45.10.12NOERROR, 14 ms, authoritativenoyes / yesrefused-
ns3.fu-berlin.de 130.133.1.57NOERROR, 18 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 7 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: atalante.stanford.edu: "9.20.22". 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 2026101402 · primary ns1.fu-berlin.de

Found

Primary (MNAME)
ns1.fu-berlin.de
Contact (RNAME)
hostmaster.zedat.fu-berlin.de
Serial
2026101402
Refresh / retry
10800 s / 3600 s
Expire
2419200 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
atalante.stanford.edu (171.64.7.61)2026101402
atalante.stanford.edu (2607:f6d0:0:d32::ab40:73d)2026101402
dns-2.dfn.de (193.174.75.54)2026101402
dns-2.dfn.de (2001:638:d:b102::1)2026101402
ns1.fu-berlin.de (160.45.8.8)2026101402
ns2.fu-berlin.de (160.45.10.12)2026101402
ns3.fu-berlin.de (130.133.1.57)2026101402

Checks

  • ✓ Serial 2026101402 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 28d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.fu-berlin.de is one of the listed nameservers.
  • ✓ Contact hostmaster@zedat.fu-berlin.de #25
    The SOA RNAME hostmaster.zedat.fu-berlin.de means hostmaster@zedat.fu-berlin.de.
  • ✓ Date-based serial #26
    The serial 2026101402 follows the YYYYMMDDnn convention (2026-10-14).

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
171.64.7.61:53
TypeValueTTL
SOAns1.fu-berlin.de. hostmaster.zedat.fu-berlin.de. 2026101402 10800 3600 2419200 360086400
NSns3.fu-berlin.de.86400
NSdns-2.dfn.de.86400
NSns1.fu-berlin.de.86400
NSns2.fu-berlin.de.86400
NSatalante.stanford.edu.86400
A160.45.170.1086400
MX10 mail.fu-berlin.de.86400
TXT"google-site-verification=PHjgp6on3_FOQukeeiSYVvb-bxEFoh9nfJ8XRXnPtIw"86400
TXT"v=spf1 include:_spf.fu-berlin.de -all"86400
CAA0 issuewild ";"86400
CAA0 issue "harica.gr"86400
CAA0 iodef "mailto:certificate@fu-berlin.de"86400
CAA0 issuemail "harica.gr"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, 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: none (issuance forbidden), harica.gr.