uni-hohenheim.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
!Passed with warnings
22 passed 3 warnings 0 failed 4 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

dns1.belwue.de, dns3.belwue.de, ns1.uni-hohenheim.de, ns2.uni-hohenheim.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.belwue.de, dns3.belwue.de, ns1.uni-hohenheim.de, ns2.uni-hohenheim.de
NS in the zone
dns1.belwue.de, dns3.belwue.de, ns1.uni-hohenheim.de, ns2.uni-hohenheim.de
NameserverAddressesNetwork (AS)Glue
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
ns1.uni-hohenheim.de144.41.2.20 2001:7c0:2700:1002::20AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE144.41.2.20
ns2.uni-hohenheim.de144.41.5.20 2001:7c0:2700:1005::20AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE144.41.5.20

Checks

  • ✓ 4 nameservers #6
    Delegated to dns1.belwue.de, dns3.belwue.de, ns1.uni-hohenheim.de, ns2.uni-hohenheim.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.uni-hohenheim.de (glue 144.41.2.20, zone 144.41.2.20, 2001:7c0:2700:1002::20); ns2.uni-hohenheim.de (glue 144.41.5.20, zone 144.41.5.20, 2001:7c0:2700:1005::20). 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.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS553 (BELWUE - Universitaet Stuttgart, DE): 8 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • 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

warn

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
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, 8 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
ns1.uni-hohenheim.de 144.41.2.20NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns1.uni-hohenheim.de 2001:7c0:2700:1002::20NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns2.uni-hohenheim.de 144.41.5.20NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns2.uni-hohenheim.de 2001:7c0:2700:1005::20NOERROR, 8 ms, authoritativenoyes / yesrefused-

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.
  • !
    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)". 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

pass

serial 2026102102 · primary ns1.uni-hohenheim.de

Found

Primary (MNAME)
ns1.uni-hohenheim.de
Contact (RNAME)
hostmaster.uni-hohenheim.de
Serial
2026102102
Refresh / retry
21600 s / 3600 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
dns1.belwue.de (129.143.2.10)2026102102
dns1.belwue.de (2001:7c0::53:10)2026102102
dns3.belwue.de (129.143.253.133)2026102102
dns3.belwue.de (2001:7c0:0:253::133)2026102102
ns1.uni-hohenheim.de (144.41.2.20)2026102102
ns1.uni-hohenheim.de (2001:7c0:2700:1002::20)2026102102
ns2.uni-hohenheim.de (144.41.5.20)2026102102
ns2.uni-hohenheim.de (2001:7c0:2700:1005::20)2026102102

Checks

  • ✓ Serial 2026102102 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 1h, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.uni-hohenheim.de is one of the listed nameservers.
  • ✓ Contact hostmaster@uni-hohenheim.de #25
    The SOA RNAME hostmaster.uni-hohenheim.de means hostmaster@uni-hohenheim.de.
  • ✓ Date-based serial #26
    The serial 2026102102 follows the YYYYMMDDnn convention (2026-10-21).

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

pass

20 records at the apex

Found

Read from
129.143.2.10:53
TypeValueTTL
SOAns1.uni-hohenheim.de. hostmaster.uni-hohenheim.de. 2026102102 21600 3600 604800 360086400
NSns1.uni-hohenheim.de.86400
NSns2.uni-hohenheim.de.86400
NSdns1.belwue.de.86400
NSdns3.belwue.de.86400
A144.41.103.10543200
MX10 smtp2.rz.uni-hohenheim.de.43200
MX30 smtp4.rz.uni-hohenheim.de.43200
MX10 smtp1.rz.uni-hohenheim.de.43200
TXT"deepl-domain-verification=0b65569fe50e4b57ad9c2f211d021f7a"43200
TXT"MS=ms63560316"43200
TXT"MS=9097E1765E2931D4EBB2B15E7219C890641E0B23"43200
TXT"cisco-ci-domain-verification=60220318273c3421738b516cfa761de634db33b9882755d9c5527296266f8c4"43200
TXT"v=spf1 mx ip4:144.41.3.88/32 ip4:144.41.4.88/31 ip4:144.41.4.126/32 ip6:2001:7c0:2700:1004::126/64 ~all"43200
TXT"google-site-verification=RLXawPddgD3oNsNhGoCQRYhLILkZfqMrLfCKxCoFTIM"43200
TXT"HARICA-DacYFK8l9JmJpPW9ANr"43200
TXT"apple-domain-verification=pAqIy5TDUQfsLdHJ"43200
CAA0 issue "letsencrypt.org"43200
CAA0 issue "harica.gr"43200
CAA0 issue "pki.dfn.de"43200

Checks

  • ✓ TTLs within range #32
    TTLs: A 12h, MX 12h, 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: letsencrypt.org, harica.gr, pki.dfn.de.