bnitm.de

Checked 21 October 2026, 21:50 UTC · via 8.8.8.8
!Passed with warnings
21 passed 1 warning 0 failed 7 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-3.dfn.de, dns1.rrz.uni-hamburg.de, dns2.rrz.uni-hamburg.de, ns.rrz.uni-hamburg.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-3.dfn.de, dns1.rrz.uni-hamburg.de, dns2.rrz.uni-hamburg.de, ns.rrz.uni-hamburg.de
NS in the zone
dns-3.dfn.de, dns1.rrz.uni-hamburg.de, dns2.rrz.uni-hamburg.de, ns.rrz.uni-hamburg.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-
dns1.rrz.uni-hamburg.de134.100.33.228 2001:638:710:21::531AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE134.100.33.228 2001:638:710:21::531
dns2.rrz.uni-hamburg.de134.100.33.229 2001:638:710:21::532AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE134.100.33.229 2001:638:710:21::532
ns.rrz.uni-hamburg.de134.100.29.165AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE134.100.29.165

Checks

  • ✓ 4 nameservers #6
    Delegated to dns-3.dfn.de, dns1.rrz.uni-hamburg.de, dns2.rrz.uni-hamburg.de, ns.rrz.uni-hamburg.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 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): 7 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: ns.rrz.uni-hamburg.de.
    #13

Nameservers

info

7 of 7 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-3.dfn.de 193.174.75.58NOERROR, 10 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 2001:638:d:b103::1NOERROR, 10 ms, authoritativenoyes / yesrefused0
dns1.rrz.uni-hamburg.de 134.100.33.228NOERROR, 17 ms, authoritativenoyes / yesrefusedsurely you must be joking
dns1.rrz.uni-hamburg.de 2001:638:710:21::531NOERROR, 13 ms, authoritativenoyes / yesrefusedsurely you must be joking
dns2.rrz.uni-hamburg.de 134.100.33.229NOERROR, 12 ms, authoritativenoyes / yesrefusedsurely you must be joking
dns2.rrz.uni-hamburg.de 2001:638:710:21::532NOERROR, 12 ms, authoritativenoyes / yesrefusedsurely you must be joking
ns.rrz.uni-hamburg.de 134.100.29.165NOERROR, 11 ms, authoritativenoyes / yesrefusedsurely you must be joking

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: dns-3.dfn.de: "0"; dns1.rrz.uni-hamburg.de: "surely you must be joking"; dns2.rrz.uni-hamburg.de: "surely you must be joking"; ns.rrz.uni-hamburg.de: "surely you must be joking".
    #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 2026101901 · primary ns.rrz.uni-hamburg.de

Found

Primary (MNAME)
ns.rrz.uni-hamburg.de
Contact (RNAME)
netgroup.rrz.uni-hamburg.de
Serial
2026101901
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
7200 s

Serial per nameserver

NameserverSerial
dns-3.dfn.de (193.174.75.58)2026101901
dns-3.dfn.de (2001:638:d:b103::1)2026101901
dns1.rrz.uni-hamburg.de (134.100.33.228)2026101901
dns1.rrz.uni-hamburg.de (2001:638:710:21::531)2026101901
dns2.rrz.uni-hamburg.de (134.100.33.229)2026101901
dns2.rrz.uni-hamburg.de (2001:638:710:21::532)2026101901
ns.rrz.uni-hamburg.de (134.100.29.165)2026101901

Checks

  • ✓ Serial 2026101901 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 2h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.rrz.uni-hamburg.de is one of the listed nameservers.
  • ✓ Contact netgroup@rrz.uni-hamburg.de #25
    The SOA RNAME netgroup.rrz.uni-hamburg.de means netgroup@rrz.uni-hamburg.de.
  • ✓ Date-based serial #26
    The serial 2026101901 follows the YYYYMMDDnn convention (2026-10-19).

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

info

14 records at the apex

Found

Read from
193.174.75.58:53
TypeValueTTL
SOAns.rrz.uni-hamburg.de. netgroup.rrz.uni-hamburg.de. 2026101901 10800 3600 604800 7200300
NSdns-3.dfn.de.300
NSdns1.rrz.uni-hamburg.de.300
NSns.rrz.uni-hamburg.de.300
NSdns2.rrz.uni-hamburg.de.300
A82.207.187.7300
MX10 mx05.rrz.uni-hamburg.de.300
MX10 mx03.rrz.uni-hamburg.de.300
MX10 mx04.rrz.uni-hamburg.de.300
TXT"google-site-verification=WVroVFUcX76pTBF5RcQJpPgIt4dhUZakulpn0iAuNJw"300
TXT"MS=FB4D123E5368052AB26AF7265D16FA0941DFE103"300
TXT"v=spf1 a mx a:vereinonline.org ip4:134.100.38.64/26 ip4:195.145.124.0/29 ip4:217.113.45.225 ip6:2a02:ea2:c101:1::25:200 ~all"300
TXT"ZA=m1jE/Usjly68tDGwwW3AKQ=="300
TXT"brevo-code:9d3f3c99f6a55725f56bf7d19d57d8e0"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, NS 5m. The NS TTL at the parent is 1d and in the zone 5m; 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.
  • 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