srh-university.de

Checked 22 October 2026, 00:30 UTC · via 8.8.8.8
!Passed with warnings
23 passed 1 warning 0 failed 5 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

a.regfish-ns.net, b.regfish-ns.net, c.regfish-ns.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
a.regfish-ns.net, b.regfish-ns.net, c.regfish-ns.net
NS in the zone
a.regfish-ns.net, b.regfish-ns.net, c.regfish-ns.net
NameserverAddressesNetwork (AS)Glue
a.regfish-ns.net178.21.144.21 2a02:2c0:0:21::aced:beefAS203560 REGFISH-AS - regfish GmbH, DE AS203560 REGFISH-AS - regfish GmbH, DE-
b.regfish-ns.net178.21.145.21 2a02:2c0:1:21::aced:beefAS203560 REGFISH-AS - regfish GmbH, DE AS203560 REGFISH-AS - regfish GmbH, DE-
c.regfish-ns.net178.21.146.21 2a02:2c0:2:21::aced:beefAS203560 REGFISH-AS - regfish GmbH, DE AS203560 REGFISH-AS - regfish GmbH, DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to a.regfish-ns.net, b.regfish-ns.net, c.regfish-ns.net.
  • ✓ 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 3 IPv4 /24s and 3 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS203560 (REGFISH-AS - regfish GmbH, 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 .net
    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

pass

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a.regfish-ns.net 178.21.144.21NOERROR, 3 ms, authoritativenoyes / yesrefused-
a.regfish-ns.net 2a02:2c0:0:21::aced:beefNOERROR, 4 ms, authoritativenoyes / yesrefused-
b.regfish-ns.net 178.21.145.21NOERROR, 4 ms, authoritativenoyes / yesrefused-
b.regfish-ns.net 2a02:2c0:1:21::aced:beefNOERROR, 4 ms, authoritativenoyes / yesrefused-
c.regfish-ns.net 178.21.146.21NOERROR, 4 ms, authoritativenoyes / yesrefused-
c.regfish-ns.net 2a02:2c0:2:21::aced:beefNOERROR, 4 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

pass

serial 1782216839 · primary a.regfish-ns.net

Found

Primary (MNAME)
a.regfish-ns.net
Contact (RNAME)
dns.regfish-ns.net
Serial
1782216839
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
a.regfish-ns.net (178.21.144.21)1782216839
a.regfish-ns.net (2a02:2c0:0:21::aced:beef)1782216839
b.regfish-ns.net (178.21.145.21)1782216839
b.regfish-ns.net (2a02:2c0:1:21::aced:beef)1782216839
c.regfish-ns.net (178.21.146.21)1782216839
c.regfish-ns.net (2a02:2c0:2:21::aced:beef)1782216839

Checks

  • ✓ Serial 1782216839 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver a.regfish-ns.net is one of the listed nameservers.
  • ✓ Contact dns@regfish-ns.net #25
    The SOA RNAME dns.regfish-ns.net means dns@regfish-ns.net.
  • ✓ Timestamp serial #26
    The serial 1782216839 is a Unix timestamp (2026-06-23 12:13 UTC).

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

info

9 records at the apex

Found

Read from
178.21.144.21:53
TypeValueTTL
SOAa.regfish-ns.net. dns.regfish-ns.net. 1782216839 28800 7200 604800 8640086400
NSb.regfish-ns.net.86400
NSa.regfish-ns.net.86400
NSc.regfish-ns.net.86400
A49.13.192.244300
MX1 srhuniversity-de0i.mail.protection.outlook.com.600
TXT"MS=ms77729256"3600
TXT"v=spf1 include:spf.protection.outlook.com include:_spf.general.transactional-mail-a.com -all"600
TXT"google-site-verification=vRzqZ2A1wJV8CPRyectMk3dCrFkZnCuufulN5ckWB3k"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 10m, 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