yellowmap.de

Checked 22 October 2026, 01:10 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

ns1.cas-software.de, ns1.cas.de, ns2.cas-software.de, ns2.cas.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.cas-software.de, ns1.cas.de, ns2.cas-software.de, ns2.cas.de
NS in the zone
ns1.cas-software.de, ns1.cas.de, ns2.cas-software.de, ns2.cas.de
NameserverAddressesNetwork (AS)Glue
ns1.cas-software.de217.160.81.161 2001:8d8:fe:53:217:160:81:161AS8560 IONOS-AS - IONOS SE, DE AS8560 IONOS-AS - IONOS SE, DE217.160.81.161 2001:8d8:fe:53:217:160:81:161
ns1.cas.de217.160.80.161 2001:8d8:fe:53:217:160:80:161AS8560 IONOS-AS - IONOS SE, DE AS8560 IONOS-AS - IONOS SE, DE217.160.80.161 2001:8d8:fe:53:217:160:80:161
ns2.cas-software.de185.132.34.161 2607:f1c0:fe:53:185:132:34:161AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB185.132.34.161 2607:f1c0:fe:53:185:132:34:161
ns2.cas.de185.132.35.161 2607:f1c0:fe:53:185:132:35:161AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB185.132.35.161 2607:f1c0:fe:53:185:132:35:161

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1.cas-software.de, ns1.cas.de, ns2.cas-software.de, ns2.cas.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 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 .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

info

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.cas-software.de 217.160.81.161NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns1.cas-software.de 2001:8d8:fe:53:217:160:81:161NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns1.cas.de 217.160.80.161NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns1.cas.de 2001:8d8:fe:53:217:160:80:161NOERROR, 10 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns2.cas-software.de 185.132.34.161NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns2.cas-software.de 2607:f1c0:fe:53:185:132:34:161NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns2.cas.de 185.132.35.161NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns2.cas.de 2607:f1c0:fe:53:185:132:35:161NOERROR, 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: ns1.cas-software.de: "Served by PowerDNS - https://www.powerdns.com/"; ns1.cas.de: "Served by PowerDNS - https://www.powerdns.com/"; ns2.cas-software.de: "Served by PowerDNS - https://www.powerdns.com/"; ns2.cas.de: "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 2025100913 · primary ns1.cas.de

Found

Primary (MNAME)
ns1.cas.de
Contact (RNAME)
hostmaster.cas.de
Serial
2025100913
Refresh / retry
43200 s / 7200 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns1.cas-software.de (217.160.81.161)2025100913
ns1.cas-software.de (2001:8d8:fe:53:217:160:81:161)2025100913
ns1.cas.de (217.160.80.161)2025100913
ns1.cas.de (2001:8d8:fe:53:217:160:80:161)2025100913
ns2.cas-software.de (185.132.34.161)2025100913
ns2.cas-software.de (2607:f1c0:fe:53:185:132:34:161)2025100913
ns2.cas.de (185.132.35.161)2025100913
ns2.cas.de (2607:f1c0:fe:53:185:132:35:161)2025100913

Checks

  • ✓ Serial 2025100913 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 12h, retry 2h, expire 14d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.cas.de is one of the listed nameservers.
  • ✓ Contact hostmaster@cas.de #25
    The SOA RNAME hostmaster.cas.de means hostmaster@cas.de.
  • ✓ Date-based serial #26
    The serial 2025100913 follows the YYYYMMDDnn convention (2025-10-09).

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

18 records at the apex

Found

Read from
217.160.81.161:53
TypeValueTTL
SOAns1.cas.de. hostmaster.cas.de. 2025100913 43200 7200 1209600 8640086400
NSns2.cas-software.de.86400
NSns1.cas.de.86400
NSns2.cas.de.86400
NSns1.cas-software.de.86400
A81.26.172.131900
MX10 cas-de.mail.cloud.nospamproxy.com.600
TXT"_5q7gi12sgii8vm256cp5wl7v1v5sghx"300
TXT"bs9y4xpj4rg9tlpxbj6cbbr006m6jfhm"300
TXT"_fxt68kdzhnapgoiuumkt8zvf2gdwpi0"300
TXT"swisssign-check=KYiIUJn6kXeVucC1Qff5I1Qx0sk"300
TXT"kC+On+YKejqhpOuz43SQyy/nbveUfTCk7wp0AgqjJYQ="300
TXT"_23r7et93fqa1srjd15ybdvyb4cwbcwu"300
TXT"google-site-verification=_LZO_UkgWuynk6iAYR4tCoZlBAmoltJkOHcUnHqIFR8"300
TXT"v=spf1 ip4:213.144.5.0/24 ip4:81.26.172.128/26 ip4:85.115.20.0/27 include:inxserver.com include:spf.protection.outlook.com mx include:spf.cas-de.cloud.nospamproxy.com -all"300
TXT"2vj5n5rk92qzl55xsrmhls1xjm29c23t"300
TXT"1vzjh3685lxz8sd4m06nwwbjyyvhw00v"300
CAA0 issuemail "globalsign.com"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 15m, MX 10m, NS 1d.
  • ✓ 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
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: .