zaw.de

Checked 22 October 2026, 01:10 UTC · via 8.8.8.8
✗Problems found
22 passed 3 warnings 1 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

warn

ns01.agenturserver.co, ns01.agenturserver.de, ns01.agenturserver.it

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns01.agenturserver.co, ns01.agenturserver.de, ns01.agenturserver.it
NS in the zone
ns01.agenturserver.co, ns01.agenturserver.de, ns01.agenturserver.it
NameserverAddressesNetwork (AS)Glue
ns01.agenturserver.co185.247.150.113AS201011 CORE-BACKBONE - Core-Backbone GmbH, DE-
ns01.agenturserver.de185.247.151.111AS15817 MITTWALD-AS - Robert Meyer trading as _Mittwald CM Service GmbH & Co. KG_, DE185.247.151.111
ns01.agenturserver.it185.247.151.112AS15817 MITTWALD-AS - Robert Meyer trading as _Mittwald CM Service GmbH & Co. KG_, DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to ns01.agenturserver.co, ns01.agenturserver.de, ns01.agenturserver.it.
  • ✓ 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 2 IPv4 /24s and 0 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS15817 (MITTWALD-AS - Robert Meyer trading as _Mittwald CM Service GmbH & Co. KG_, DE): 2 addresses; AS201011 (CORE-BACKBONE - Core-Backbone GmbH, DE): 1 address.
  • ✓ Nameserver names under 3 TLDs #12
    Nameserver names use the TLDs .co, .de, .it.
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

fail

3 of 3 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns01.agenturserver.co 185.247.150.113NOERROR, 3 ms, authoritativenono / yesrefused-
ns01.agenturserver.de 185.247.151.111NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns01.agenturserver.it 185.247.151.112NOERROR, 9 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 3 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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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: ns01.agenturserver.co (185.247.150.113): .
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 2026102128 · primary ns01.agenturserver.de

Found

Primary (MNAME)
ns01.agenturserver.de
Contact (RNAME)
support.mittwald.de
Serial
2026102128
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns01.agenturserver.co (185.247.150.113)2026102128
ns01.agenturserver.de (185.247.151.111)2026102128
ns01.agenturserver.it (185.247.151.112)2026102128

Checks

  • ✓ Serial 2026102128 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns01.agenturserver.de is one of the listed nameservers.
  • ✓ Contact support@mittwald.de #25
    The SOA RNAME support.mittwald.de means support@mittwald.de.
  • ✓ Date-based serial #26
    The serial 2026102128 follows the YYYYMMDDnn convention (2026-10-21).

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

warn

6 records at the apex

Found

Read from
185.247.150.113:53
TypeValueTTL
SOAns01.agenturserver.de. support.mittwald.de. 2026102128 28800 7200 604800 360010800
NSns01.agenturserver.co.3600
NSns01.agenturserver.de.3600
NSns01.agenturserver.it.3600
AAAA2a03:2a01:a330:c::460
MX10 mail.zaw.de.60

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: AAAA (1m), MX (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1d and in the zone 1h; resolvers may use either.
    #32
  • ✓ 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