uni-stuttgart.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
!Passed with warnings
26 passed 1 warning 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

dns-auth1.uni-stuttgart.de, dns-auth2.uni-stuttgart.edu, dns-auth3.uni-stuttgart.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-auth1.uni-stuttgart.de, dns-auth2.uni-stuttgart.edu, dns-auth3.uni-stuttgart.net
NS in the zone
dns-auth1.uni-stuttgart.de, dns-auth2.uni-stuttgart.edu, dns-auth3.uni-stuttgart.net
NameserverAddressesNetwork (AS)Glue
dns-auth1.uni-stuttgart.de129.69.252.129 2001:7c0:2053:5301::1AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE129.69.252.129 2001:7c0:2053:5301::1
dns-auth2.uni-stuttgart.edu129.69.252.145 2001:7c0:2053:5302::1AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE-
dns-auth3.uni-stuttgart.net129.69.252.153 2001:7c0:2053:5303::1AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to dns-auth1.uni-stuttgart.de, dns-auth2.uni-stuttgart.edu, dns-auth3.uni-stuttgart.net.
  • ✓ 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: dns-auth1.uni-stuttgart.de.
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • !
    Nameservers in one network
    all IPv4 addresses are in 129.69.252.0/24; all IPv6 addresses are in 2001:7c0:2053::/48. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS553 (BELWUE - Universitaet Stuttgart, DE): 6 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • ✓ Nameserver names under 3 TLDs #12
    Nameserver names use the TLDs .de, .edu, .net.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-auth1.uni-stuttgart.de 129.69.252.129NOERROR, 9 ms, authoritativenoyes / yesrefused-
dns-auth1.uni-stuttgart.de 2001:7c0:2053:5301::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
dns-auth2.uni-stuttgart.edu 129.69.252.145NOERROR, 7 ms, authoritativenoyes / yesrefused-
dns-auth2.uni-stuttgart.edu 2001:7c0:2053:5302::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
dns-auth3.uni-stuttgart.net 129.69.252.153NOERROR, 7 ms, authoritativenoyes / yesrefused-
dns-auth3.uni-stuttgart.net 2001:7c0:2053:5303::1NOERROR, 7 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 6 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

info

serial 2026101408 · primary dns-hm0.rus.uni-stuttgart.de

Found

Primary (MNAME)
dns-hm0.rus.uni-stuttgart.de
Contact (RNAME)
dns-support.rus.uni-stuttgart.de
Serial
2026101408
Refresh / retry
3600 s / 900 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
dns-auth1.uni-stuttgart.de (129.69.252.129)2026101408
dns-auth1.uni-stuttgart.de (2001:7c0:2053:5301::1)2026101408
dns-auth2.uni-stuttgart.edu (129.69.252.145)2026101408
dns-auth2.uni-stuttgart.edu (2001:7c0:2053:5302::1)2026101408
dns-auth3.uni-stuttgart.net (129.69.252.153)2026101408
dns-auth3.uni-stuttgart.net (2001:7c0:2053:5303::1)2026101408

Checks

  • ✓ Serial 2026101408 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 15m, expire 14d, negative TTL 1h.
  • i
    Hidden master
    The primary nameserver dns-hm0.rus.uni-stuttgart.de is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact dns-support@rus.uni-stuttgart.de #25
    The SOA RNAME dns-support.rus.uni-stuttgart.de means dns-support@rus.uni-stuttgart.de.
  • ✓ Date-based serial #26
    The serial 2026101408 follows the YYYYMMDDnn convention (2026-10-14).

DNSSEC

info

Signed, DS published at parent

Found

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

DS at the parent

Key tagAlgorithmDigestMatches a key
44093ECDSAP256SHA256 (13)SHA256 481616AD6F491086…yes

DNSKEY in the zone

Key tagRoleAlgorithm
27002ZSK (256)ECDSAP256SHA256 (13)
44093KSK (257)ECDSAP256SHA256 (13)

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 44093 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-11-15 #30
    The earliest DNSKEY/SOA signature expires at 2026-11-15 05:29 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

16 records at the apex

Found

Read from
129.69.252.129:53
TypeValueTTL
SOAdns-hm0.rus.uni-stuttgart.de. dns-support.rus.uni-stuttgart.de. 2026101408 3600 900 1209600 36003600
NSdns-auth3.uni-stuttgart.net.3600
NSdns-auth1.uni-stuttgart.de.3600
NSdns-auth2.uni-stuttgart.edu.3600
A129.69.0.473600
AAAA2001:7c0:2041:48::473600
MX10 mxex1.tik.uni-stuttgart.de.3600
MX10 mxex2.tik.uni-stuttgart.de.3600
TXT"adobe-idp-site-verification=89e0898d92cb1af1264a5095a1ec46b6c591d4af17b8881af3e833ef42b33814"3600
TXT"google-site-verification=H44ewdpwEWItGRRimCVxcR_ecOlVXvOgXeKE9RgM2ts"3600
TXT"security_contact=noc@uni-stuttgart.de"3600
TXT"HARICA-nUcytuSG6DImGKcrieG"3600
TXT"University of Stuttgart"3600
TXT"v=spf1 include:_spf.mxex.uni-stuttgart.de include:_spf.mailrelay.uni-stuttgart.de"3600
TXT"MS=D72A25682508B3822D00441FBB6C7A2A083F0400"3600
TXT"atlassian-domain-verification=mw1Y7z/KOJZxm0aAkF8bQwT1rT1x6RBD8fj3bBciJVtq1jDX97u/Jkgk7mxstpBf"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, AAAA 1h, 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