in-ulm.de

Checked 21 October 2026, 23:00 UTC · via 8.8.8.8
iAll checks passed
27 passed 0 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

info

ns1.in-ulm.de, ns2.in-ulm.de, ns3.in-ulm.de, ns4.in-ulm.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.in-ulm.de, ns2.in-ulm.de, ns3.in-ulm.de, ns4.in-ulm.de
NS in the zone
ns1.in-ulm.de, ns2.in-ulm.de, ns3.in-ulm.de, ns4.in-ulm.de
NameserverAddressesNetwork (AS)Glue
ns1.in-ulm.de217.10.10.250 2001:1410:200:afa::1AS25538 IN-ULM - Internet Ulm/Neu-Ulm e.V., DE AS25538 IN-ULM - Internet Ulm/Neu-Ulm e.V., DE217.10.10.250 2001:1410:200:afa::1
ns2.in-ulm.de62.245.182.139AS8767 MNET-AS - M-net Telekommunikations GmbH, DE62.245.182.139
ns3.in-ulm.de217.10.11.250 2001:1410:200:bfa::1AS25538 IN-ULM - Internet Ulm/Neu-Ulm e.V., DE AS25538 IN-ULM - Internet Ulm/Neu-Ulm e.V., DE217.10.11.250 2001:1410:200:bfa::1
ns4.in-ulm.de212.227.164.163 2a01:239:4b3:3100::1AS8560 IONOS-AS - IONOS SE, DE AS8560 IONOS-AS - IONOS SE, DE212.227.164.163 2a01:239:4b3:3100::1

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1.in-ulm.de, ns2.in-ulm.de, ns3.in-ulm.de, ns4.in-ulm.de.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: ns1.in-ulm.de, ns2.in-ulm.de, ns3.in-ulm.de, ns4.in-ulm.de.
  • ✓ 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.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS25538 (IN-ULM - Internet Ulm/Neu-Ulm e.V., DE): 4 addresses; AS8560 (IONOS-AS - IONOS SE, DE): 2 addresses; AS8767 (MNET-AS - M-net Telekommunikations GmbH, DE): 1 address.
  • 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: ns2.in-ulm.de.
    #13

Nameservers

pass

7 of 7 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.in-ulm.de 217.10.10.250NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns1.in-ulm.de 2001:1410:200:afa::1NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns2.in-ulm.de 62.245.182.139NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns3.in-ulm.de 217.10.11.250NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns3.in-ulm.de 2001:1410:200:bfa::1NOERROR, 16 ms, authoritativenoyes / yesrefused-
ns4.in-ulm.de 212.227.164.163NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns4.in-ulm.de 2a01:239:4b3:3100::1NOERROR, 13 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 2026013218 · primary ns1.in-ulm.de

Found

Primary (MNAME)
ns1.in-ulm.de
Contact (RNAME)
hostmaster.in-ulm.de
Serial
2026013218
Refresh / retry
43200 s / 3600 s
Expire
2419200 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns1.in-ulm.de (217.10.10.250)2026013218
ns1.in-ulm.de (2001:1410:200:afa::1)2026013218
ns2.in-ulm.de (62.245.182.139)2026013218
ns3.in-ulm.de (217.10.11.250)2026013218
ns3.in-ulm.de (2001:1410:200:bfa::1)2026013218
ns4.in-ulm.de (212.227.164.163)2026013218
ns4.in-ulm.de (2a01:239:4b3:3100::1)2026013218

Checks

  • ✓ Serial 2026013218 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 12h, retry 1h, expire 28d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.in-ulm.de is one of the listed nameservers.
  • ✓ Contact hostmaster@in-ulm.de #25
    The SOA RNAME hostmaster.in-ulm.de means hostmaster@in-ulm.de.
  • ✓ Timestamp serial #26
    The serial 2026013218 is a Unix timestamp (2034-03-15 05:26 UTC).

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC
Signatures valid until
17 November 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
28360RSASHA256 (8)SHA256 2585BDEE1183E1E7…yes

DNSKEY in the zone

Key tagRoleAlgorithm
28360KSK (257)RSASHA256 (8)
22494ZSK (256)RSASHA256 (8)

Checks

  • ✓ Signed and validated #27
    The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
  • ✓ DS matches a key #28
    The DS record at the parent matches a key in the zone: key tag 28360 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: RSASHA256 (8).
  • ✓ Signatures valid until 2026-11-17 #30
    The earliest DNSKEY/SOA signature expires at 2026-11-17 12:48 UTC.
  • i
    NSEC
    The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.
    #31

Records

info

9 records at the apex

Found

Read from
217.10.10.250:53
TypeValueTTL
SOAns1.in-ulm.de. hostmaster.in-ulm.de. 2026013218 43200 3600 2419200 8640086400
NSns4.in-ulm.de.86400
NSns1.in-ulm.de.86400
NSns2.in-ulm.de.86400
NSns3.in-ulm.de.86400
A217.10.8.7886400
MX10 pmg.in-ulm.de.3600
TXT"Internet Ulm/Neu-Ulm e.V."86400
TXT"v=spf1 a mx ip4:217.10.8.14 ip4:217.10.8.27 ip6:2001:1410:200:80e::1 ip6:2001:1410:200:81b::1 -all"86400

Checks

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