hlrs.de

Checked 21 October 2026, 22:50 UTC · via 8.8.8.8
!Passed with warnings
25 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

info

dns-srv1.uni-stuttgart.de, dns-srv2.uni-stuttgart.edu, dns-srv3.uni-stuttgart.net, dns1.belwue.de, dns3.belwue.de, dns5.belwue.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-srv1.uni-stuttgart.de, dns-srv2.uni-stuttgart.edu, dns-srv3.uni-stuttgart.net, dns1.belwue.de, dns3.belwue.de, dns5.belwue.de
NS in the zone
dns-srv1.uni-stuttgart.de, dns-srv2.uni-stuttgart.edu, dns-srv3.uni-stuttgart.net, dns1.belwue.de, dns3.belwue.de, dns5.belwue.de
NameserverAddressesNetwork (AS)Glue
dns-srv1.uni-stuttgart.de129.69.252.130 2001:7c0:2053:5301::2AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE-
dns-srv2.uni-stuttgart.edu129.69.252.146 2001:7c0:2053:5302::2AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE-
dns-srv3.uni-stuttgart.net129.69.252.154 2001:7c0:2053:5303::2AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE-
dns1.belwue.de129.143.2.10 2001:7c0::53:10AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE129.143.2.10 2001:7c0::53:10
dns3.belwue.de129.143.253.133 2001:7c0:0:253::133AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE129.143.253.133 2001:7c0:0:253::133
dns5.belwue.de129.143.4.5 2001:7c0::53:5AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE129.143.4.5 2001:7c0::53:5

Checks

  • ✓ 6 nameservers #6
    Delegated to dns-srv1.uni-stuttgart.de, dns-srv2.uni-stuttgart.edu, dns-srv3.uni-stuttgart.net, dns1.belwue.de, dns3.belwue.de, dns5.belwue.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.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS553 (BELWUE - Universitaet Stuttgart, DE): 12 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

warn

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-srv1.uni-stuttgart.de 129.69.252.130NOERROR, 7 ms, authoritativenoyes / yesrefused-
dns-srv1.uni-stuttgart.de 2001:7c0:2053:5301::2NOERROR, 9 ms, authoritativenoyes / yesrefused-
dns-srv2.uni-stuttgart.edu 129.69.252.146NOERROR, 9 ms, authoritativenoyes / yesrefused-
dns-srv2.uni-stuttgart.edu 2001:7c0:2053:5302::2NOERROR, 11 ms, authoritativenoyes / yesrefused-
dns-srv3.uni-stuttgart.net 129.69.252.154NOERROR, 7 ms, authoritativenoyes / yesrefused-
dns-srv3.uni-stuttgart.net 2001:7c0:2053:5303::2NOERROR, 8 ms, authoritativenoyes / yesrefused-
dns1.belwue.de 129.143.2.10NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns1.belwue.de 2001:7c0::53:10NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns3.belwue.de 129.143.253.133NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns3.belwue.de 2001:7c0:0:253::133NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns5.belwue.de 129.143.4.5NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns5.belwue.de 2001:7c0::53:5NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)

Checks

  • ✓ All respond #14
    All 12 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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: dns1.belwue.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)"; dns3.belwue.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)"; dns5.belwue.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)". Hide or replace the version string.
    #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

warn

serial 2017277449 · primary dns0.hlrs.de

Found

Primary (MNAME)
dns0.hlrs.de
Contact (RNAME)
hostmaster.hlrs.de
Serial
2017277449
Refresh / retry
600 s / 120 s
Expire
2419200 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
dns-srv1.uni-stuttgart.de (129.69.252.130)2017277449
dns-srv1.uni-stuttgart.de (2001:7c0:2053:5301::2)2017277449
dns-srv2.uni-stuttgart.edu (129.69.252.146)2017277449
dns-srv2.uni-stuttgart.edu (2001:7c0:2053:5302::2)2017277449
dns-srv3.uni-stuttgart.net (129.69.252.154)2017277449
dns-srv3.uni-stuttgart.net (2001:7c0:2053:5303::2)2017277449
dns1.belwue.de (129.143.2.10)2017277449
dns1.belwue.de (2001:7c0::53:10)2017277449
dns3.belwue.de (129.143.253.133)2017277449
dns3.belwue.de (2001:7c0:0:253::133)2017277449
dns5.belwue.de (129.143.4.5)2017277449
dns5.belwue.de (2001:7c0::53:5)2017277449

Checks

  • ✓ Serial 2017277449 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    refresh 10m is outside 20m–1d. Current values: refresh 10m, retry 2m, expire 28d, negative TTL 15m.
    #23
  • i
    Hidden master
    The primary nameserver dns0.hlrs.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 hostmaster@hlrs.de #25
    The SOA RNAME hostmaster.hlrs.de means hostmaster@hlrs.de.
  • ✓ Timestamp serial #26
    The serial 2017277449 is a Unix timestamp (2033-12-04 02:50 UTC).

DNSSEC

info

Signed, DS published at parent

Found

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

DS at the parent

Key tagAlgorithmDigestMatches a key
55436ECDSAP256SHA256 (13)SHA256 817898D2314DF0A2…yes

DNSKEY in the zone

Key tagRoleAlgorithm
62391ZSK (256)ECDSAP256SHA256 (13)
50450ZSK (256)ECDSAP256SHA256 (13)
55436KSK (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 55436 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-11-02 #30
    The earliest DNSKEY/SOA signature expires at 2026-11-02 08:52 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

13 records at the apex

Found

Read from
129.69.252.130:53
TypeValueTTL
SOAdns0.hlrs.de. hostmaster.hlrs.de. 2017277449 600 120 2419200 900900
NSdns-srv2.uni-stuttgart.edu.900
NSdns1.belwue.de.900
NSdns5.belwue.de.900
NSdns3.belwue.de.900
NSdns-srv1.uni-stuttgart.de.900
NSdns-srv3.uni-stuttgart.net.900
A141.58.2.1900
MX10 mgw.hlrs.de.900
TXT"cisco-ci-domain-verification=40dc9711565cf8b64437af9d5a593c666d41d73f775006d1619d0986786d0444"900
TXT"v=spf1 mx ip4:141.58.0.0/20 ip4:129.69.40.240/28 ~all"900
TXT"HARICA-JzJn1WlNSzKOVL9MnA3"900
TXT"adobe-idp-site-verification=89e0898d92cb1af1264a5095a1ec46b6c591d4af17b8881af3e833ef42b33814"900

Checks

  • ✓ TTLs within range #32
    TTLs: A 15m, MX 15m, NS 15m. The NS TTL at the parent is 1d and in the zone 15m; 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