ulm.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
!Passed with warnings
21 passed 2 warnings 0 failed 6 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

warn

ns1.swu.de, ns2.swu.de, ns3.swu.de, ns4.swu.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.swu.de, ns2.swu.de, ns3.swu.de, ns4.swu.de
NS in the zone
ns1.swu.de, ns2.swu.de, ns3.swu.de, ns4.swu.de
NameserverAddressesNetwork (AS)Glue
ns1.swu.de217.160.80.161 2001:8d8:fe:53:217:160:80:161AS8560 IONOS-AS - IONOS SE, DE AS8560 IONOS-AS - IONOS SE, DE62.116.159.81 2001:4178:3:a357:62:116:159:81
ns2.swu.de217.160.81.161 2001:8d8:fe:53:217:160:81:161AS8560 IONOS-AS - IONOS SE, DE AS8560 IONOS-AS - IONOS SE, DE217.160.113.113 2001:8d8:580:401:217:160:113:113
ns3.swu.de185.132.35.161 2607:f1c0:fe:53:185:132:35:161AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB89.146.248.78 2a01:130:2000:118:89:146:248:78
ns4.swu.de185.132.34.161 2607:f1c0:fe:53:185:132:34:161AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB74.208.254.77 2607:f1c0:1800:8091:74:208:254:77

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1.swu.de, ns2.swu.de, ns3.swu.de, ns4.swu.de.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • !
    Glue differs from the zone
    The addresses at the parent (glue) differ from the addresses in the zone: ns1.swu.de (glue 62.116.159.81, 2001:4178:3:a357:62:116:159:81, zone 217.160.80.161, 2001:8d8:fe:53:217:160:80:161); ns2.swu.de (glue 217.160.113.113, 2001:8d8:580:401:217:160:113:113, zone 217.160.81.161, 2001:8d8:fe:53:217:160:81:161); ns3.swu.de (glue 89.146.248.78, 2a01:130:2000:118:89:146:248:78, zone 185.132.35.161, 2607:f1c0:fe:53:185:132:35:161); ns4.swu.de (glue 74.208.254.77, 2607:f1c0:1800:8091:74:208:254:77, zone 185.132.34.161, 2607:f1c0:fe:53:185:132:34:161). Update the glue at your registrar.
    #8
  • ✓ 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.swu.de 217.160.80.161NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns1.swu.de 2001:8d8:fe:53:217:160:80:161NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns2.swu.de 217.160.81.161NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns2.swu.de 2001:8d8:fe:53:217:160:81:161NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns3.swu.de 185.132.35.161NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns3.swu.de 2607:f1c0:fe:53:185:132:35:161NOERROR, 4 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns4.swu.de 185.132.34.161NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns4.swu.de 2607:f1c0:fe:53:185:132:34:161NOERROR, 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.swu.de: "Served by PowerDNS - https://www.powerdns.com/"; ns2.swu.de: "Served by PowerDNS - https://www.powerdns.com/"; ns3.swu.de: "Served by PowerDNS - https://www.powerdns.com/"; ns4.swu.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 2026011332 · primary ns1.swu.de

Found

Primary (MNAME)
ns1.swu.de
Contact (RNAME)
ip.swu.de
Serial
2026011332
Refresh / retry
43200 s / 7200 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns1.swu.de (217.160.80.161)2026011332
ns1.swu.de (2001:8d8:fe:53:217:160:80:161)2026011332
ns2.swu.de (217.160.81.161)2026011332
ns2.swu.de (2001:8d8:fe:53:217:160:81:161)2026011332
ns3.swu.de (185.132.35.161)2026011332
ns3.swu.de (2607:f1c0:fe:53:185:132:35:161)2026011332
ns4.swu.de (185.132.34.161)2026011332
ns4.swu.de (2607:f1c0:fe:53:185:132:34:161)2026011332

Checks

  • ✓ Serial 2026011332 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.swu.de is one of the listed nameservers.
  • ✓ Contact ip@swu.de #25
    The SOA RNAME ip.swu.de means ip@swu.de.
  • ✓ Date-based serial #26
    The serial 2026011332 follows the YYYYMMDDnn convention (2026-01-13).

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

15 records at the apex

Found

Read from
217.160.80.161:53
TypeValueTTL
SOAns1.swu.de. ip.swu.de. 2026011332 43200 7200 1209600 8640086400
NSns4.swu.de.86400
NSns1.swu.de.86400
NSns2.swu.de.86400
NSns3.swu.de.86400
A20.103.215.7586400
MX10 mx8.kvnbw.de.86400
MX10 mx9.kvnbw.de.86400
MX10 mx6.kvnbw.de.86400
MX10 mx7.kvnbw.de.86400
TXT"6537cceffd130604ba8ff3902b655cde"900
TXT"v=spf1 a mx include:spf.protect.kvnbw.de include:spf.crsend.com include:internet-xs.de include:ekom21.de include:_spf-eu.ionos.com include:spf.routing.net ip4:80.148.47.163 ip4:83.246.86.0/24 ip4:91.203.200.74 ip4:91.203.200.22 ~all"900
TXT"cisco-ci-domain-verification=14b99022af1bce74a4689754e3dfaa8ac0915f942e8b661cfe1f11d12a32cc49"900
TXT"bdmpq4tule713fld1t03ebp4rb"900
TXT"apple-domain-verification=PqeYARXx1TX5wE8B"900

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, MX 1d, 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
  • 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