gu.de

Checked 21 October 2026, 22:41 UTC · via 8.8.8.8
!Passed with warnings
23 passed 1 warning 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

a.ns14.net, b.ns14.net, c.ns14.net, d.ns14.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
a.ns14.net, b.ns14.net, c.ns14.net, d.ns14.net
NS in the zone
a.ns14.net, b.ns14.net, c.ns14.net, d.ns14.net
NameserverAddressesNetwork (AS)Glue
a.ns14.net217.160.80.160 2001:8d8:fe:53:217:160:80:160AS8560 IONOS-AS - IONOS SE, DE AS8560 IONOS-AS - IONOS SE, DE-
b.ns14.net217.160.81.160 2001:8d8:fe:53:217:160:81:160AS8560 IONOS-AS - IONOS SE, DE AS8560 IONOS-AS - IONOS SE, DE-
c.ns14.net185.132.35.160 2607:f1c0:fe:53:185:132:35:160AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB-
d.ns14.net185.132.34.160 2607:f1c0:fe:53:185:132:34:160AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB-

Checks

  • ✓ 4 nameservers #6
    Delegated to a.ns14.net, b.ns14.net, c.ns14.net, d.ns14.net.
  • ✓ 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 4 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS15418 (IONOS-ANYCAST - Fasthosts Internet Limited, GB): 4 addresses; AS8560 (IONOS-AS - IONOS SE, DE): 4 addresses.
  • i
    All nameserver names under .net
    All nameserver names are under one TLD, so a problem with that TLD also makes the nameservers unreachable. Some operators use names under two TLDs for extra resilience.
    #12
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a.ns14.net 217.160.80.160NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
a.ns14.net 2001:8d8:fe:53:217:160:80:160NOERROR, 10 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
b.ns14.net 217.160.81.160NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
b.ns14.net 2001:8d8:fe:53:217:160:81:160NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
c.ns14.net 185.132.35.160NOERROR, 4 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
c.ns14.net 2607:f1c0:fe:53:185:132:35:160NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
d.ns14.net 185.132.34.160NOERROR, 4 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
d.ns14.net 2607:f1c0:fe:53:185:132:34:160NOERROR, 4 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: a.ns14.net: "Served by PowerDNS - https://www.powerdns.com/"; b.ns14.net: "Served by PowerDNS - https://www.powerdns.com/"; c.ns14.net: "Served by PowerDNS - https://www.powerdns.com/"; d.ns14.net: "Served by PowerDNS - https://www.powerdns.com/".
    #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 2025121206 · primary a.ns14.net

Found

Primary (MNAME)
a.ns14.net
Contact (RNAME)
hostmaster.gu.de
Serial
2025121206
Refresh / retry
28800 s / 7200 s
Expire
1209600 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
a.ns14.net (217.160.80.160)2025121206
a.ns14.net (2001:8d8:fe:53:217:160:80:160)2025121206
b.ns14.net (217.160.81.160)2025121206
b.ns14.net (2001:8d8:fe:53:217:160:81:160)2025121206
c.ns14.net (185.132.35.160)2025121206
c.ns14.net (2607:f1c0:fe:53:185:132:35:160)2025121206
d.ns14.net (185.132.34.160)2025121206
d.ns14.net (2607:f1c0:fe:53:185:132:34:160)2025121206

Checks

  • ✓ Serial 2025121206 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 14d, negative TTL 10m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver a.ns14.net is one of the listed nameservers.
  • ✓ Contact hostmaster@gu.de #25
    The SOA RNAME hostmaster.gu.de means hostmaster@gu.de.
  • ✓ Date-based serial #26
    The serial 2025121206 follows the YYYYMMDDnn convention (2025-12-12).

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

21 records at the apex

Found

Read from
217.160.80.160:53
TypeValueTTL
SOAa.ns14.net. hostmaster.gu.de. 2025121206 28800 7200 1209600 600600
NSa.ns14.net.600
NSb.ns14.net.600
NSd.ns14.net.600
NSc.ns14.net.600
A23.227.38.65600
MX5 mxb-00596a01.gslb.pphosted.com.600
MX5 mxa-00596a01.gslb.pphosted.com.600
TXT"facebook-domain-verification=0fo9c2ha7nqoqjr95efesth2cdeb1h"600
TXT"3361ced520a9b3b10b43bdfb1c5cda1513651ed6"600
TXT"knowbe4-site-verification=0694ce74005828dc4bb8b7299bfb6f61"600
TXT"facebook-domain-verification=5r7ie2xpusikbe4dg9tbifmeufjzg9"600
TXT"google-site-verification=qnXLNdBkLJczRLvithTaniygYsqVWA44jaXmeTtwIbQ"600
TXT"ZOOM_verify_jjGY0qV3OJ1E0du4uxQb7L"600
TXT"asv_domain=a0af15d08530a617bfbe225499c7088e"600
TXT"atlassian-sending-domain-verification=4c1fe4dd-1c02-48f2-a8e9-fe4a6776630e"600
TXT"ADNS"600
TXT"v=spf1 include:spf.easybill-mail.de include:27012882.spf06.hubspotemail.net include:spf.flexiconf.com include:_spf.psm.knowbe4.com include:_spf.wpcloud.com include:spf-00596a01.pphosted.com include:spf.protection.outlook.com include:145800545.spf07.hubspo" "temail.net include:mailgun.org ~all"600
TXT"bw=72KOcRS1tGqqQwef9h2a1DHHUfyOlDSQ4BMaHrxomsJL"600
TXT"atlassian-domain-verification=44u2arSH/BE6WtFie5Ua55QvaIWyh31VqUPMFW7TasPRnh3yQaOhcapxnn9kiEKy"600
TXT"MS=ms67237601"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, MX 10m, NS 10m. The NS TTL at the parent is 1d and in the zone 10m; 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