troisdorf.de

Checked 22 October 2026, 00:41 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

dns-relaix.regioit-aachen.de, dns01.regioit-aachen.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-relaix.regioit-aachen.de, dns01.regioit-aachen.de
NS in the zone
dns-relaix.regioit-aachen.de, dns01.regioit-aachen.de
NameserverAddressesNetwork (AS)Glue
dns-relaix.regioit-aachen.de5.145.135.174 2a00:fe0:1:148::2AS34953 RELAIX - RelAix Networks GmbH, DE AS34953 RELAIX - RelAix Networks GmbH, DE5.145.135.174 2a00:fe0:1:148::2
dns01.regioit-aachen.de91.102.136.26 2a02:16f0::5:26AS34928 regioitaachen - regioitaachen, DE AS34928 regioitaachen - regioitaachen, DE91.102.136.26 2a02:16f0::5:26

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: dns-relaix.regioit-aachen.de, dns01.regioit-aachen.de.
    #6
  • ✓ 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 2 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS34928 (regioitaachen - regioitaachen, DE): 2 addresses; AS34953 (RELAIX - RelAix Networks GmbH, DE): 2 addresses.
  • i
    All nameserver names under .de
    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

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-relaix.regioit-aachen.de 5.145.135.174NOERROR, 9 ms, authoritativenoyes / yesrefused-
dns-relaix.regioit-aachen.de 2a00:fe0:1:148::2NOERROR, 9 ms, authoritativenoyes / yesrefused-
dns01.regioit-aachen.de 91.102.136.26NOERROR, 11 ms, authoritativenoyes / yesrefused-
dns01.regioit-aachen.de 2a02:16f0::5:26NOERROR, 11 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 4 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 2023052561 · primary dns01.regioit-aachen.de

Found

Primary (MNAME)
dns01.regioit-aachen.de
Contact (RNAME)
hostmaster.civitec.de
Serial
2023052561
Refresh / retry
3600 s / 7200 s
Expire
3600000 s
Negative TTL
7200 s

Serial per nameserver

NameserverSerial
dns-relaix.regioit-aachen.de (5.145.135.174)2023052561
dns-relaix.regioit-aachen.de (2a00:fe0:1:148::2)2023052561
dns01.regioit-aachen.de (91.102.136.26)2023052561
dns01.regioit-aachen.de (2a02:16f0::5:26)2023052561

Checks

  • ✓ Serial 2023052561 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    retry 2h should be shorter than refresh 1h. Current values: refresh 1h, retry 2h, expire 1000h, negative TTL 2h.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns01.regioit-aachen.de is one of the listed nameservers.
  • ✓ Contact hostmaster@civitec.de #25
    The SOA RNAME hostmaster.civitec.de means hostmaster@civitec.de.
  • ✓ Date-based serial #26
    The serial 2023052561 follows the YYYYMMDDnn convention (2023-05-25).

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

10 records at the apex

Found

Read from
5.145.135.174:53
TypeValueTTL
SOAdns01.regioit-aachen.de. hostmaster.civitec.de. 2023052561 3600 7200 3600000 72003600
NSdns-relaix.regioit-aachen.de.3600
NSdns01.regioit-aachen.de.3600
A89.110.176.2363600
MX10 gw12.civitec.de.7200
MX10 gw11.civitec.de.7200
TXT"MS=8BCF9966641B3DDB92FBB19EA6143CCD6CBCBE58"3600
TXT"brevo-code:b97bec109755ad3eba7a88598c420a3b"3600
TXT"swisssign-check=BCIyuCo43vC3s7CGGSFdGiuPX6o"3600
TXT"v=spf1 mx ip4:195.243.56.0/24 ip4:195.243.129.128/26 include:spf.regioit.de a:otc-de-spf.mms.t-systems-service.com -all"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, MX 2h, 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.
  • 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