gc-gruppe.de

Checked 21 October 2026, 22:32 UTC · via 8.8.8.8
!Passed with warnings
25 passed 1 warning 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

info

ns.europe.adacor.net, ns.global.adacor.net, ns5.adacor.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.europe.adacor.net, ns.global.adacor.net, ns5.adacor.net
NS in the zone
ns.europe.adacor.net, ns.global.adacor.net, ns5.adacor.net
NameserverAddressesNetwork (AS)Glue
ns.europe.adacor.net194.58.196.58 2a01:3f1:858::53AS8674 NETNOD-IX - Netnod AB, SE AS8674 NETNOD-IX - Netnod AB, SE-
ns.global.adacor.net194.58.198.59 2a01:3f1:3059::53AS56908 NETNOD-NDS - Netnod AB, SE AS56908 NETNOD-NDS - Netnod AB, SE-
ns5.adacor.net185.42.137.113 2a01:3f0:400::58AS8674 NETNOD-IX - Netnod AB, SE AS8674 NETNOD-IX - Netnod AB, SE-

Checks

  • ✓ 3 nameservers #6
    Delegated to ns.europe.adacor.net, ns.global.adacor.net, ns5.adacor.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 3 IPv4 /24s and 3 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS56908 (NETNOD-NDS - Netnod AB, SE): 2 addresses; AS8674 (NETNOD-IX - Netnod AB, SE): 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

pass

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.europe.adacor.net 194.58.196.58NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns.europe.adacor.net 2a01:3f1:858::53NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns.global.adacor.net 194.58.198.59NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns.global.adacor.net 2a01:3f1:3059::53NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns5.adacor.net 185.42.137.113NOERROR, 28 ms, authoritativenoyes / yesrefused-
ns5.adacor.net 2a01:3f0:400::58NOERROR, 26 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 6 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

pass

serial 2026101601 · primary ns.europe.adacor.net

Found

Primary (MNAME)
ns.europe.adacor.net
Contact (RNAME)
hostmaster.adacor.net
Serial
2026101601
Refresh / retry
10000 s / 1800 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns.europe.adacor.net (194.58.196.58)2026101601
ns.europe.adacor.net (2a01:3f1:858::53)2026101601
ns.global.adacor.net (194.58.198.59)2026101601
ns.global.adacor.net (2a01:3f1:3059::53)2026101601
ns5.adacor.net (185.42.137.113)2026101601
ns5.adacor.net (2a01:3f0:400::58)2026101601

Checks

  • ✓ Serial 2026101601 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h46m40s, retry 30m, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.europe.adacor.net is one of the listed nameservers.
  • ✓ Contact hostmaster@adacor.net #25
    The SOA RNAME hostmaster.adacor.net means hostmaster@adacor.net.
  • ✓ Date-based serial #26
    The serial 2026101601 follows the YYYYMMDDnn convention (2026-10-16).

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

pass

29 records at the apex

Found

Read from
194.58.196.58:53
TypeValueTTL
SOAns.europe.adacor.net. hostmaster.adacor.net. 2026101601 10000 1800 604800 36003600
NSns.global.adacor.net.3600
NSns5.adacor.net.3600
NSns.europe.adacor.net.3600
A20.74.42.303600
A20.74.41.1903600
A20.74.41.2183600
MX0 gcgruppe-de0e.mail.protection.outlook.com.3600
TXT"v=spf1 mx ip4:109.69.65.129 ip4:185.111.169.48 ip4:185.111.169.10 ip4:185.111.169.12 ip4:185.111.169.29 ip4:185.111.170.23 include:spf.protection.outlook.com include:em1440.gc-gruppe.de include:spf.mailjet.com -all"3600
TXT"MS=ms20176724"3600
TXT"kbgsoiohtoatkdvafc75e9097d"3600
TXT"rhmuv31gbmfvka37a5o6m03g14"3600
TXT"apple-domain-verification=YE2Hip1O1RlQVKcF"3600
TXT"docusign=fd1fc546-0863-488e-b1c2-f5de45aa0d30"3600
TXT"jamf-site-verification=Y4SMeUOhSvHiQCuoVfkfSA"3600
TXT"d365mktkey=jbxiegK7gTVHeJnhUZXS1FqRKKmV9ODsIwrVxxXxXGsx"3600
TXT"miro-verification=8ead30e64c5da4fda8df346888b7d0425fc95c12"3600
TXT"teamviewer-sso-verification=a32bb7137f014acfacfd78686691a854"3600
TXT"anthropic-domain-verification-cp078n=PNobOvVusmweUyiARdG8S2XIM"3600
TXT"notion-domain-verification=H2rptvvmD7OGN1ivMKqqAUfd12OaxzQ9jznX1RZATZ2"3600
TXT"atlassian-sending-domain-verification=95447583-e1e4-43ba-b674-227b2226f517"3600
TXT"Q6V5+19RspHc5MQgItSs+D6CMGBxuq0f7WqHTWwvDl/45+umzNCpvsiAgYOwWw/OHCN1+6LvdUoAbEwVG1UvXA=="3600
TXT"mindmanager-verification=cb5c61cf3fa263fc8908becb51d7dbdb2a68e437a5d9f32c0d027a9bbf3efe1f"3600
TXT"adobe-idp-site-verification=3ca61603fcfd1d953ba77501a239ddc58292351884ac9e664be097aa475aa8a3"3600
TXT"atlassian-domain-verification=gPCnnB52yg5Z2UXYRLtQbRVzaW9fc6fyhkysvJs0NoXaARFnS8ExZzuJ7REKwrx2"3600
CAA0 issue "globalsign.com"3600
CAA0 issue "godaddy.com"3600
CAA0 issue "letsencrypt.org"3600
CAA0 issue "digicert.com"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.
  • ✓ No wildcard #34
    Names that don't exist return NXDOMAIN.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: globalsign.com, godaddy.com, letsencrypt.org, digicert.com.