fernuni-hagen.de

Checked 21 October 2026, 22:20 UTC · via 8.8.8.8
!Passed with warnings
21 passed 1 warning 0 failed 7 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-1.dfn.de, ns1.fernuni-hagen.de, ns2.fernuni-hagen.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-1.dfn.de, ns1.fernuni-hagen.de, ns2.fernuni-hagen.de
NS in the zone
dns-1.dfn.de, ns1.fernuni-hagen.de, ns2.fernuni-hagen.de
NameserverAddressesNetwork (AS)Glue
dns-1.dfn.de193.174.75.50 2001:638:d:b101::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
ns1.fernuni-hagen.de132.176.129.3AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE132.176.129.3
ns2.fernuni-hagen.de132.176.129.15AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE132.176.129.15

Checks

  • ✓ 3 nameservers #6
    Delegated to dns-1.dfn.de, ns1.fernuni-hagen.de, ns2.fernuni-hagen.de.
  • ✓ 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: ns1.fernuni-hagen.de, ns2.fernuni-hagen.de.
  • ✓ 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 2 IPv4 /24s and 1 IPv6 /48.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 4 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns1.fernuni-hagen.de, ns2.fernuni-hagen.de.
    #13

Nameservers

info

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-1.dfn.de 193.174.75.50NOERROR, 12 ms, authoritativenoyes / yesrefused0
dns-1.dfn.de 2001:638:d:b101::1NOERROR, 13 ms, authoritativenoyes / yesrefused0
ns1.fernuni-hagen.de 132.176.129.3NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns2.fernuni-hagen.de 132.176.129.15NOERROR, 11 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 4 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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: dns-1.dfn.de: "0".
    #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 2011034142 · primary ns1.fernuni-hagen.de

Found

Primary (MNAME)
ns1.fernuni-hagen.de
Contact (RNAME)
hostmaster.fernuni-hagen.de
Serial
2011034142
Refresh / retry
21600 s / 1800 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
dns-1.dfn.de (193.174.75.50)2011034142
dns-1.dfn.de (2001:638:d:b101::1)2011034142
ns1.fernuni-hagen.de (132.176.129.3)2011034142
ns2.fernuni-hagen.de (132.176.129.15)2011034142

Checks

  • ✓ Serial 2011034142 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 30m, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.fernuni-hagen.de is one of the listed nameservers.
  • ✓ Contact hostmaster@fernuni-hagen.de #25
    The SOA RNAME hostmaster.fernuni-hagen.de means hostmaster@fernuni-hagen.de.
  • ✓ Timestamp serial #26
    The serial 2011034142 is a Unix timestamp (2033-09-22 20:35 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

11 records at the apex

Found

Read from
193.174.75.50:53
TypeValueTTL
SOAns1.fernuni-hagen.de. hostmaster.fernuni-hagen.de. 2011034142 21600 1800 1209600 360086400
NSdns-1.dfn.de.3600
NSns1.fernuni-hagen.de.3600
NSns2.fernuni-hagen.de.3600
A132.176.184.1603600
MX10 mx01.fernuni-hagen.de.3600
MX10 mx02.fernuni-hagen.de.3600
TXT"adobe-idp-site-verification=80e9982dcdbc4e751cdfe4bcdbbbf6af6d7593164d36fcb2f5a1cf09be0e5e58"3600
TXT"apple-domain-verification=zMfgxNM4q9kMj44J"3600
TXT"v=spf1 include:_spf.fernuni-hagen.de include:spf.protection.outlook.com ~all"3600
TXT"zone-ownership-verification-3575339f6b03ba91ede99bd45c6563c41be42834ecbb602f8942d0bb86a432bf"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 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