nrw.de

Checked 21 October 2026, 23:40 UTC · via 8.8.8.8
✗Problems found
18 passed 0 warnings 2 failed 6 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

a.it.nrw, b.nrw.de, c.nrw.de, deneb.dfn.de, dns.globvill.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
a.it.nrw, b.nrw.de, c.nrw.de, deneb.dfn.de, dns.globvill.de
NS in the zone
a.it.nrw, b.nrw.de, c.nrw.de, deneb.dfn.de, dns.globvill.de
NameserverAddressesNetwork (AS)Glue
a.it.nrw93.184.132.50AS43066 IT-NRW - IT-NRW, DE-
b.nrw.de93.184.128.141AS43066 IT-NRW - IT-NRW, DE93.184.128.141
c.nrw.de93.184.141.69AS43066 IT-NRW - IT-NRW, DE93.184.141.69
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-
dns.globvill.de212.20.191.2 2001:40b8::22AS13039 GLOBAL-VILLAGE - Global Village GmbH, DE AS13039 GLOBAL-VILLAGE - Global Village GmbH, DE-

Checks

  • ✓ 5 nameservers #6
    Delegated to a.it.nrw, b.nrw.de, c.nrw.de, deneb.dfn.de, dns.globvill.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: b.nrw.de, c.nrw.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.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS13039 (GLOBAL-VILLAGE - Global Village GmbH, DE): 2 addresses; AS43066 (IT-NRW - IT-NRW, DE): 3 addresses; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 2 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .nrw.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: a.it.nrw, b.nrw.de, c.nrw.de.
    #13

Nameservers

fail

6 of 7 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a.it.nrw 93.184.132.50no responsenono / no--
b.nrw.de 93.184.128.141NOERROR, 10 ms, authoritativenono / yesrefused-
c.nrw.de 93.184.141.69NOERROR, 10 ms, authoritativenoyes / yesrefused-
deneb.dfn.de 192.76.176.9NOERROR, 14 ms, authoritativenoyes / yesrefused0
deneb.dfn.de 2001:638:800:1::9NOERROR, 14 ms, authoritativenoyes / yesrefused0
dns.globvill.de 212.20.191.2NOERROR, 7 ms, authoritativenoyes / yesrefuseddns
dns.globvill.de 2001:40b8::22NOERROR, 7 ms, authoritativenoyes / yesrefuseddns

Checks

  • ✗
    Nameservers not responding
    These addresses did not answer, so resolvers waste time on timeouts: a.it.nrw (93.184.132.50): read udp 46.225.38.91:37179->93.184.132.50:53: i/o timeout.
    #14
  • ✓ 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: deneb.dfn.de: "0"; dns.globvill.de: "dns".
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: b.nrw.de (93.184.128.141): read tcp 46.225.38.91:47886->93.184.128.141:53: i/o timeout.
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 2026102109 · primary a.it.nrw

Found

Primary (MNAME)
a.it.nrw
Contact (RNAME)
webhosting.it.nrw.de
Serial
2026102109
Refresh / retry
28800 s / 7200 s
Expire
3024000 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
b.nrw.de (93.184.128.141)2026102109
c.nrw.de (93.184.141.69)2026102109
deneb.dfn.de (192.76.176.9)2026102109
deneb.dfn.de (2001:638:800:1::9)2026102109
dns.globvill.de (212.20.191.2)2026102109
dns.globvill.de (2001:40b8::22)2026102109

Checks

  • ✓ Serial 2026102109 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 35d, negative TTL 10m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver a.it.nrw is one of the listed nameservers.
  • ✓ Contact webhosting@it.nrw.de #25
    The SOA RNAME webhosting.it.nrw.de means webhosting@it.nrw.de.
  • ✓ Date-based serial #26
    The serial 2026102109 follows the YYYYMMDDnn convention (2026-10-21).

DNSSEC

info

Not signed

Found

Validated by resolver
no
Lookup error: read udp 46.225.38.91:55482->93.184.128.141:53: i/o timeout

Checks

  • i
    Could not be checked
    The DNSSEC lookup failed, so this could not be checked: read udp 46.225.38.91:55482->93.184.128.141:53: i/o timeout
    #27

Records

info

read udp 46.225.38.91:47120->93.184.128.141:53: i/o timeout

Checks

  • i
    Could not be checked
    The apex records lookup failed, so this could not be checked: read udp 46.225.38.91:47120->93.184.128.141:53: i/o timeout
    #32