taz.de

Checked 22 October 2026, 00:32 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

pass

ns.ipberlin.com, ns3.ipberlin.com, osiris.taz.de, tazns01.lwlcom.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.ipberlin.com, ns3.ipberlin.com, osiris.taz.de, tazns01.lwlcom.net
NS in the zone
ns.ipberlin.com, ns3.ipberlin.com, osiris.taz.de, tazns01.lwlcom.net
NameserverAddressesNetwork (AS)Glue
ns.ipberlin.com194.29.226.17 2a02:f28:2:0:194:29:226:17AS20647 IPB - IPB Internet Provider in Berlin GmbH, DE AS20647 IPB - IPB Internet Provider in Berlin GmbH, DE-
ns3.ipberlin.com194.29.230.17 2a02:f28:2:1:194:29:230:17AS20647 IPB - IPB Internet Provider in Berlin GmbH, DE AS20647 IPB - IPB Internet Provider in Berlin GmbH, DE-
osiris.taz.de193.104.220.1 2001:67c:13c::2AS16075 TAZ-AS - TAZ-AS, DE AS16075 TAZ-AS - TAZ-AS, DE193.104.220.1 2001:67c:13c::2
tazns01.lwlcom.net185.55.117.31 2a00:c380:8000:1::31AS50629 LWLCOM - LWLcom GmbH, DE AS50629 LWLCOM - LWLcom GmbH, DE-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns.ipberlin.com, ns3.ipberlin.com, osiris.taz.de, tazns01.lwlcom.net.
  • ✓ 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: osiris.taz.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 4 IPv4 /24s and 3 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS16075 (TAZ-AS - TAZ-AS, DE): 2 addresses; AS20647 (IPB - IPB Internet Provider in Berlin GmbH, DE): 4 addresses; AS50629 (LWLCOM - LWLcom GmbH, DE): 2 addresses.
  • ✓ Nameserver names under 3 TLDs #12
    Nameserver names use the TLDs .com, .de, .net.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.ipberlin.com 194.29.226.17NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns.ipberlin.com 2a02:f28:2:0:194:29:226:17NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns3.ipberlin.com 194.29.230.17NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns3.ipberlin.com 2a02:f28:2:1:194:29:230:17NOERROR, 12 ms, authoritativenoyes / yesrefused-
osiris.taz.de 193.104.220.1NOERROR, 11 ms, authoritativenoyes / yesrefused9.20.30-1~deb13u1-Debian
osiris.taz.de 2001:67c:13c::2NOERROR, 11 ms, authoritativenoyes / yesrefused9.20.30-1~deb13u1-Debian
tazns01.lwlcom.net 185.55.117.31NOERROR, 9 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.24.04.8-Ubuntu
tazns01.lwlcom.net 2a00:c380:8000:1::31NOERROR, 10 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.24.04.8-Ubuntu

Checks

  • ✓ All respond #14
    All 8 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: osiris.taz.de: "9.20.30-1~deb13u1-Debian"; tazns01.lwlcom.net: "9.18.39-0ubuntu0.24.04.8-Ubuntu". 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 2026091001 · primary osiris.taz.de

Found

Primary (MNAME)
osiris.taz.de
Contact (RNAME)
hostmaster.taz.de
Serial
2026091001
Refresh / retry
14400 s / 7200 s
Expire
3000000 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns.ipberlin.com (194.29.226.17)2026091001
ns.ipberlin.com (2a02:f28:2:0:194:29:226:17)2026091001
ns3.ipberlin.com (194.29.230.17)2026091001
ns3.ipberlin.com (2a02:f28:2:1:194:29:230:17)2026091001
osiris.taz.de (193.104.220.1)2026091001
osiris.taz.de (2001:67c:13c::2)2026091001
tazns01.lwlcom.net (185.55.117.31)2026091001
tazns01.lwlcom.net (2a00:c380:8000:1::31)2026091001

Checks

  • ✓ Serial 2026091001 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 2h, expire 50000m, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver osiris.taz.de is one of the listed nameservers.
  • ✓ Contact hostmaster@taz.de #25
    The SOA RNAME hostmaster.taz.de means hostmaster@taz.de.
  • ✓ Date-based serial #26
    The serial 2026091001 follows the YYYYMMDDnn convention (2026-09-10).

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

19 records at the apex

Found

Read from
194.29.226.17:53
TypeValueTTL
SOAosiris.taz.de. hostmaster.taz.de. 2026091001 14400 7200 3000000 8640086400
NSns.ipberlin.com.86400
NStazns01.lwlcom.net.86400
NSosiris.taz.de.86400
NSns3.ipberlin.com.86400
A193.104.220.2386400
AAAA2001:67c:13c::7a2:de86400
MX4 prime.taz.de.86400
MX4 isis.taz.de.86400
TXT"google-site-verification=wVmqSygpOr2D3RWIrjscZkwkdTx3oLVftjZqV5isapk"86400
TXT"google-site-verification=YFanqmWAmGg7-f6kQrljxkU51Uz1Jln-2-OpY6cjdgI"86400
TXT"v=spf1 ip4:193.104.220.0/25 ip6:2001:67c:13c::/48 -all"86400
TXT"sendinblue-code:d63320b053dde6b4aeda7f56ef9977e1"86400
TXT"ZOOM_verify_F46fdfl9SGSDi75NhvXAKQ"86400
TXT"MS=C5CCF32B521E32B0CADD4DF2A496828F1B649391"86400
TXT"2b8f2f31d011a000676fe5646730712961e6be56"86400
TXT"21.02.2025"86400
TXT"cisco-ci-domain-verification=3b7b83ffa84288aacd381919e81fb78930ad7489034c5e70e385b6ae24ea9194"86400
TXT"adobe-idp-site-verification=d1a7871405eacdda6420de0aaae055604e00dd7b99c78f4a5ba364b479cc597f"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, AAAA 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.
  • 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