otto-schmidt.de

Checked 21 October 2026, 23:42 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

dns11.netcologne.de, dns12.netcologne.de, dns13.netcologne.de, dns14.netcologne.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns11.netcologne.de, dns12.netcologne.de, dns13.netcologne.de, dns14.netcologne.de
NS in the zone
dns11.netcologne.de, dns12.netcologne.de, dns13.netcologne.de, dns14.netcologne.de
NameserverAddressesNetwork (AS)Glue
dns11.netcologne.de134.0.30.178 2a03:2900:3:1::2AS48823 AS48823 - Hosting.de GmbH, DE AS48823 AS48823 - Hosting.de GmbH, DE-
dns12.netcologne.de194.50.113.2 2001:4d8f:2::2AS41637 ROUTING-ANYCAST - Hosting.de GmbH, DE AS41637 ROUTING-ANYCAST - Hosting.de GmbH, DE-
dns13.netcologne.de194.126.196.2 2a03:2902:3:1::2AS31400 ACCELERATED-IT - firstcolo GmbH, DE AS31400 ACCELERATED-IT - firstcolo GmbH, DE-
dns14.netcologne.de185.11.139.126AS48823 AS48823 - Hosting.de GmbH, DE-

Checks

  • ✓ 4 nameservers #6
    Delegated to dns11.netcologne.de, dns12.netcologne.de, dns13.netcologne.de, dns14.netcologne.de.
  • ✓ 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 3 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS31400 (ACCELERATED-IT - firstcolo GmbH, DE): 2 addresses; AS41637 (ROUTING-ANYCAST - Hosting.de GmbH, DE): 2 addresses; AS48823 (AS48823 - Hosting.de GmbH, DE): 3 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: dns14.netcologne.de.
    #13

Nameservers

pass

7 of 7 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns11.netcologne.de 134.0.30.178NOERROR, 9 ms, authoritativenoyes / yesrefused-
dns11.netcologne.de 2a03:2900:3:1::2NOERROR, 10 ms, authoritativenoyes / yesrefused-
dns12.netcologne.de 194.50.113.2NOERROR, 9 ms, authoritativenoyes / yesrefused-
dns12.netcologne.de 2001:4d8f:2::2NOERROR, 9 ms, authoritativenoyes / yesrefused-
dns13.netcologne.de 194.126.196.2NOERROR, 5 ms, authoritativenoyes / yesrefused-
dns13.netcologne.de 2a03:2902:3:1::2NOERROR, 5 ms, authoritativenoyes / yesrefused-
dns14.netcologne.de 185.11.139.126NOERROR, 110 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 7 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 2026101900 · primary dns11.netcologne.de

Found

Primary (MNAME)
dns11.netcologne.de
Contact (RNAME)
hostmaster.routing.net
Serial
2026101900
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
dns11.netcologne.de (134.0.30.178)2026101900
dns11.netcologne.de (2a03:2900:3:1::2)2026101900
dns12.netcologne.de (194.50.113.2)2026101900
dns12.netcologne.de (2001:4d8f:2::2)2026101900
dns13.netcologne.de (194.126.196.2)2026101900
dns13.netcologne.de (2a03:2902:3:1::2)2026101900
dns14.netcologne.de (185.11.139.126)2026101900

Checks

  • ✓ Serial 2026101900 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns11.netcologne.de is one of the listed nameservers.
  • ✓ Contact hostmaster@routing.net #25
    The SOA RNAME hostmaster.routing.net means hostmaster@routing.net.
  • ✓ Date-based serial #26
    The serial 2026101900 follows the YYYYMMDDnn convention (2026-10-19).

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

14 records at the apex

Found

Read from
134.0.30.178:53
TypeValueTTL
SOAdns11.netcologne.de. hostmaster.routing.net. 2026101900 28800 7200 604800 36003600
NSdns13.netcologne.de.3600
NSdns11.netcologne.de.3600
NSdns14.netcologne.de.3600
NSdns12.netcologne.de.3600
A80.90.22.205300
AAAA2a02:cb40:400::151600
MX20 asg.otto-schmidt.de.3600
MX10 mailrelay.netcologne.de.3600
MX50 asg2.otto-schmidt.de.3600
TXT"MS=ms31963016"3600
TXT"v=spf1 include:spf.protection.outlook.com include:_spf.sendnode.com include:_spf.xqueue.com ip4:194.8.213.197 ip4:194.8.213.198 ip4:62.214.13.178 ip4:194.8.194.96 ip4:62.113.229.37 ip4:212.34.64.185 ip4:185.88.212.47 ip4:109.234.127.0/24 ip4:80.82.206.0/" "26 ip4:185.98.184.0" "/24 ip4:88.79.187.100 ip4:145.253.113.50 ip6:2a00:f48:1008::212:47:10 ~all"3600
TXT"citrix-verification-code=e6b87f8b-35cc-4ec3-9892-4a45b155361f"3600
TXT"google-site-verification=zvNkTd-DA0Q3RuX_zWK8_rnFukUkzvIImNmhvh8pmSc"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 10m, 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.
  • 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