theben.de

Checked 22 October 2026, 00:40 UTC · via 8.8.8.8
!Passed with warnings
22 passed 2 warnings 0 failed 5 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

ns.gbc.gmbh, ns.gbc.green, ns.gbc.jetzt, ns.gbc.red, ns.gbc.systems

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.gbc.gmbh, ns.gbc.green, ns.gbc.jetzt, ns.gbc.red, ns.gbc.systems
NS in the zone
ns.gbc.gmbh, ns.gbc.green, ns.gbc.jetzt, ns.gbc.red, ns.gbc.systems
NameserverAddressesNetwork (AS)Glue
ns.gbc.gmbh49.12.121.173AS24940 HETZNER-AS - Hetzner Online GmbH, DE-
ns.gbc.green192.174.68.104 2001:67c:1bc::104AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns.gbc.jetzt45.87.158.53 2a02:d500::53AS48596 INWX - InterNetworX Management GmbH, DE AS48596 INWX - InterNetworX Management GmbH, DE-
ns.gbc.red176.97.158.104 2001:67c:10b8::104AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns.gbc.systems212.97.96.154AS24766 GBCNET-AS01 - GBC GmbH Internet Service Center Ingenieurgesellschaft fuer Systemsoftware und Kommunikationstechnik, DE-

Checks

  • ✓ 5 nameservers #6
    Delegated to ns.gbc.gmbh, ns.gbc.green, ns.gbc.jetzt, ns.gbc.red, ns.gbc.systems.
  • ✓ 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 5 IPv4 /24s and 3 IPv6 /48s.
  • ✓ 4 autonomous systems #11
    The nameservers are spread over: AS1921 (RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT): 4 addresses; AS24766 (GBCNET-AS01 - GBC GmbH Internet Service Center Ingenieurgesellschaft fuer Systemsoftware und Kommunikationstechnik, DE): 1 address; AS24940 (HETZNER-AS - Hetzner Online GmbH, DE): 1 address; AS48596 (INWX - InterNetworX Management GmbH, DE): 2 addresses.
  • ✓ Nameserver names under 5 TLDs #12
    Nameserver names use the TLDs .gmbh, .green, .jetzt, .red, .systems.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns.gbc.gmbh, ns.gbc.systems.
    #13

Nameservers

warn

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.gbc.gmbh 49.12.121.173NOERROR, 3 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.22.04.7-Ubuntu
ns.gbc.green 192.174.68.104NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns.gbc.green 2001:67c:1bc::104NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns.gbc.jetzt 45.87.158.53NOERROR, 19 ms, authoritativenoyes / yesrefusedINWX AXFR Server
ns.gbc.jetzt 2a02:d500::53NOERROR, 16 ms, authoritativenoyes / yesrefusedINWX AXFR Server
ns.gbc.red 176.97.158.104NOERROR, 13 ms, authoritativenoyes / yesrefusedreg-wie1
ns.gbc.red 2001:67c:10b8::104NOERROR, 13 ms, authoritativenoyes / yesrefusedreg-wie1
ns.gbc.systems 212.97.96.154NOERROR, 11 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.22.04.7-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: ns.gbc.gmbh: "9.18.39-0ubuntu0.22.04.7-Ubuntu"; ns.gbc.systems: "9.18.39-0ubuntu0.22.04.7-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 2026061840 · primary ns.gbc.systems

Found

Primary (MNAME)
ns.gbc.systems
Contact (RNAME)
support.gbc.net
Serial
2026061840
Refresh / retry
3600 s / 900 s
Expire
1209600 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns.gbc.gmbh (49.12.121.173)2026061840
ns.gbc.green (192.174.68.104)2026061840
ns.gbc.green (2001:67c:1bc::104)2026061840
ns.gbc.jetzt (45.87.158.53)2026061840
ns.gbc.jetzt (2a02:d500::53)2026061840
ns.gbc.red (176.97.158.104)2026061840
ns.gbc.red (2001:67c:10b8::104)2026061840
ns.gbc.systems (212.97.96.154)2026061840

Checks

  • ✓ Serial 2026061840 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 15m, expire 14d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.gbc.systems is one of the listed nameservers.
  • ✓ Contact support@gbc.net #25
    The SOA RNAME support.gbc.net means support@gbc.net.
  • ✓ Date-based serial #26
    The serial 2026061840 follows the YYYYMMDDnn convention (2026-06-18).

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

27 records at the apex

Found

Read from
49.12.121.173:53
TypeValueTTL
SOAns.gbc.systems. support.gbc.net. 2026061840 3600 900 1209600 3003600
NSns.gbc.systems.3600
NSns.gbc.gmbh.3600
NSns.gbc.green.3600
NSns.gbc.jetzt.3600
NSns.gbc.red.3600
A145.253.155.1713600
MX5 theben-de.mail.protection.outlook.com.3600
TXT"_ehwmw2cfib2rqy1xg4o7bh6dwymrry8"3600
TXT"b7kOf+2xu93psLvdAPKiZOlgu+urtBc27FuT9araHNUCt84x/gXH77FxxVB0fGR4QcJsobukCfolyXwxv0hnhg=="3600
TXT"pq63l5l2qz4kb3rjmn4by0kvd0cwgkhv"3600
TXT"_globalsign-domain-verification=9do3-sr6jcv_QV-qisBuXMWYxDfhz_GheqgX402DTf"3600
TXT"globalsign-domain-verification=v239yYUL9ZzM8cqfFtgMfM8CymGKbIwFiBeclEyCsm"3600
TXT"1dp033l469cpv0qknv7ylfqbkkg9m0kq"3600
TXT"apple-domain-verification=F4A6VvZXOcgghBgw"3600
TXT"k67xGoqjLzY1Bbu2z6MxGIWRMLIjCtczzZeZh6NFZlw="3600
TXT"v=spf1 ip4:104.42.172.251 ip4:104.47.0.0/17 ip4:13.74.137.176 ip4:13.77.59.28 ip4:13.93.42.39 ip4:13.94.95.171 ip4:144.76.159.137 ip4:145.253.155.0/19 ip4:153.92.196.160/28 ip4:161.97.147.30 ip4:178.16.56.32/27 ip4:185.14.48.3 ip4:185.15.192.32/27 ip4:188" ".94.249.240/28 ip4:188.94.250.248/29 include:spf1.theben.de -all "3600
TXT"YgjTdHekKAYg39QESB5zUQ7fbqk9/rtYaf6Olyaou4k="3600
TXT"sophos-domain-verification=6469f1d4a03723bb00d3de2b76c66e52956f6a85"3600
TXT"openai-domain-verification=dv-a0l5CkgSOZBpDibLH2nJenUZ"3600
TXT"globalsign-domain-verification=ugRjfT3_v483B5Yfv98R7cAvjG9qNso2fbPMVwMbWD"3600
TXT"_globalsign-domain-verification=0TO2xW7_7faf_Dp0XEXn_zU5nr6PD0ahoYzIGhU06T"3600
TXT"QzWBP1kWvIqaJ7TyAQc4tvBPeVDNVigjvgkOOlFluqBEdLmf4sUXVW3dgkfbCKpq4gmnqCqrfBM5yw6W5CjZ+A=="3600
TXT"_globalsign-domain-verification=JEtbq9yy5zQ-XbErs5dwLAgJIi6xkdiMdUZga723uq"3600
TXT"GP9t6PVAxBo8PRioKkCqMPNO05odMFg6PV21uNF9oOKKw1w9HgA7lZEouytl2bf94STjqh05BkA7Jotz4hBtMQ=="3600
TXT"google-site-verification=Au30JIQdlzmUeQVHiGNxqedgftZN_xJGMKrKp5LiS78"3600
TXT"ls+dU9utvZlyyfVNfn+yR6wz9A0/dyJgn4y5MBw6U2fE38AiW/JM0I+pA0Hjz33qkXh0KAiHF01HD+D/ZD4Bbw=="3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, MX 1h, NS 1h. The NS TTL at the parent is 1d and in the zone 1h; resolvers may use either.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • 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