steinberg.de

Checked 22 October 2026, 00:30 UTC · via 8.8.8.8
!Passed with warnings
21 passed 2 warnings 0 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

dns-auth-2.corpex-dns.net, ns1.popidns.de, ns2.popidns.eu

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-auth-2.corpex-dns.net, ns1.popidns.de, ns2.popidns.eu
NS in the zone
dns-auth-2.corpex-dns.net, ns1.popidns.de, ns2.popidns.eu
NameserverAddressesNetwork (AS)Glue
dns-auth-2.corpex-dns.net212.53.202.135AS8893 ARTFILES-AS - Artfiles New Media GmbH, DE-
ns1.popidns.de92.223.100.53 2a03:90c0:9990::1053AS199524 GCORE - G-Core Labs S.A., LU AS199524 GCORE - G-Core Labs S.A., LU-
ns2.popidns.eu92.223.77.53 2a03:90c0:9990::2053AS199524 GCORE - G-Core Labs S.A., LU AS199524 GCORE - G-Core Labs S.A., LU-

Checks

  • ✓ 3 nameservers #6
    Delegated to dns-auth-2.corpex-dns.net, ns1.popidns.de, ns2.popidns.eu.
  • ✓ 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.
  • i
    One address family in one network
    all IPv6 addresses are in 2a03:90c0:9990::/48, while the other address family is spread over several networks.
    #10
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS199524 (GCORE - G-Core Labs S.A., LU): 4 addresses; AS8893 (ARTFILES-AS - Artfiles New Media GmbH, DE): 1 address.
  • ✓ Nameserver names under 3 TLDs #12
    Nameserver names use the TLDs .de, .eu, .net.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: dns-auth-2.corpex-dns.net.
    #13

Nameservers

pass

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-auth-2.corpex-dns.net 212.53.202.135NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns1.popidns.de 92.223.100.53NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns1.popidns.de 2a03:90c0:9990::1053NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns2.popidns.eu 92.223.77.53NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns2.popidns.eu 2a03:90c0:9990::2053NOERROR, 4 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 5 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.
  • ✓ 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

warn

serial 2026080401 · primary ns1.steinberg.de

Found

Primary (MNAME)
ns1.steinberg.de
Contact (RNAME)
hostmaster.steinberg.net
Serial
2026080401
Refresh / retry
1200 s / 600 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns-auth-2.corpex-dns.net (212.53.202.135)2026080401
ns1.popidns.de (92.223.100.53)1785861902
ns1.popidns.de (2a03:90c0:9990::1053)1785861902
ns2.popidns.eu (92.223.77.53)1785861902
ns2.popidns.eu (2a03:90c0:9990::2053)1785861902

Checks

  • !
    Serials differ
    The nameservers serve different versions of the zone: 1785861902 on ns1.popidns.de (92.223.100.53), ns1.popidns.de (2a03:90c0:9990::1053), ns2.popidns.eu (92.223.77.53), ns2.popidns.eu (2a03:90c0:9990::2053); 2026080401 on dns-auth-2.corpex-dns.net (212.53.202.135). This is normal for a few minutes after a change; if it lasts, zone transfers to the secondaries are failing.
    #22
  • ✓ Timers within recommendations #23
    SOA refresh 20m, retry 10m, expire 14d, negative TTL 1d.
  • i
    Hidden master
    The primary nameserver ns1.steinberg.de is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact hostmaster@steinberg.net #25
    The SOA RNAME hostmaster.steinberg.net means hostmaster@steinberg.net.
  • ✓ Date-based serial #26
    The serial 2026080401 follows the YYYYMMDDnn convention (2026-08-04).

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

12 records at the apex

Found

Read from
212.53.202.135:53
TypeValueTTL
SOAns1.steinberg.de. hostmaster.steinberg.net. 2026080401 1200 600 1209600 864002200
NSdns-auth-2.corpex-dns.net.2200
NSns1.popidns.de.2200
NSns2.popidns.eu.2200
A194.6.195.2072200
MX20 fallback.pop-i.de.2200
MX0 steinberg-de.mail.protection.outlook.com.2200
TXT"apple-domain-verification=gh1afB0o4tV6q2NC"2200
TXT"google-site-verification=e_R24k2nzmWgaY34BzRRPRiToP_kiRJz9s2nejFdL-4"2200
TXT"v=spf1 include:_spf.steinberg.de include:spf.protection.outlook.com include:mail.zendesk.com ~all"2200
TXT"MS=ms52568043"2200
TXT"_globalsign-domain-verification=1k2EMVqZctxdYum4SVxopD8Yh6p1f2nkv7y9CMOPsJ"2200

Checks

  • ✓ TTLs within range #32
    TTLs: A 36m40s, MX 36m40s, NS 36m40s. The NS TTL at the parent is 1d and in the zone 36m40s; 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