ph-gmuend.de

Checked 21 October 2026, 23:50 UTC · via 8.8.8.8
!Passed with warnings
20 passed 3 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

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
dns1.belwue.de, dns3.belwue.de, dns5.belwue.de
NS in the zone
dns1.belwue.de, dns3.belwue.de, dns5.belwue.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
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

  • ✓ 3 nameservers #6
    Delegated to 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.
  • i
    One address family in one network
    all IPv6 addresses are in 2001:7c0::/48, while the other address family is spread over several networks.
    #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
  • 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

6 of 6 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, 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 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.
  • !
    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 2026102001 · primary sgmndns01.sg-nad.de

Found

Primary (MNAME)
sgmndns01.sg-nad.de
Contact (RNAME)
hostmaster.ph-gmuend.de
Serial
2026102001
Refresh / retry
360 s / 2700 s
Expire
2419200 s
Negative TTL
7200 s

Serial per nameserver

NameserverSerial
dns1.belwue.de (129.143.2.10)2026102001
dns1.belwue.de (2001:7c0::53:10)2026102001
dns3.belwue.de (129.143.253.133)2026102001
dns3.belwue.de (2001:7c0:0:253::133)2026102001
dns5.belwue.de (129.143.4.5)2026102001
dns5.belwue.de (2001:7c0::53:5)2026102001

Checks

  • ✓ Serial 2026102001 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    refresh 6m is outside 20m–1d; retry 45m should be shorter than refresh 6m. Current values: refresh 6m, retry 45m, expire 28d, negative TTL 2h.
    #23
  • i
    Hidden master (not resolvable)
    The primary nameserver sgmndns01.sg-nad.de is not listed as a nameserver and does not resolve publicly: a hidden master, or a placeholder name. Some tools (e.g. dynamic updates) use MNAME to find the primary.
    #24
  • ✓ Contact hostmaster@ph-gmuend.de #25
    The SOA RNAME hostmaster.ph-gmuend.de means hostmaster@ph-gmuend.de.
  • ✓ Date-based serial #26
    The serial 2026102001 follows the YYYYMMDDnn convention (2026-10-20).

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

22 records at the apex

Found

Read from
129.143.2.10:53
TypeValueTTL
SOAsgmndns01.sg-nad.de. hostmaster.ph-gmuend.de. 2026102001 360 2700 2419200 72003600
NSdns1.belwue.de.7200
NSdns3.belwue.de.7200
NSdns5.belwue.de.7200
A3.74.177.427200
AAAA2a05:d014:14f:aa1a:aa6e:b149:4d94:9bc77200
MX10 a2791.mx.srv.dfn.de.7200
MX10 c2791.mx.srv.dfn.de.7200
MX10 b2791.mx.srv.dfn.de.7200
TXT"HARICA-yV1eQrcTWeL25gmKJeq"7200
TXT"google-site-verification=lO3YyZcitKtG9LLNU0X3wkFkJwEKSEV8NMJ6dLgxCSo"7200
TXT"MS=ms61601171"7200
TXT"Paedagogische Hochschule Schwaebisch-Gmuend, Oberbettringerstr. 200, 73525 Schwaebisch-Gmuend, Germany"7200
TXT"sophos-domain-verification=1e4d9291ceb78c0a640503a074df49b054c3a24c02d89cf62761d9307103a63d"7200
TXT"v=spf1 a:smtp0.ph-gmuend.de a:bsz.ibs-bw.de ip4:193.196.161.62 include:_spf.S2792.mx.srv.dfn.de include:spf.protection.outlook.com -all"7200
TXT"apple-domain-verification=nU82FIZWo3dguyYs"7200
CAA0 issue "harica.gr"7200
CAA0 iodef "mailto:support@ph-gmuend.de"7200
CAA0 issuewild "sectigo.com"7200
CAA0 issue "pki.dfn.de"7200
CAA0 issue "sectigo.com"7200
CAA0 issue "letsencrypt.org"7200

Checks

  • ✓ TTLs within range #32
    TTLs: A 2h, AAAA 2h, MX 2h, NS 2h. The NS TTL at the parent is 1d and in the zone 2h; 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: harica.gr, sectigo.com, pki.dfn.de, letsencrypt.org.