iks-jena.de

Checked 21 October 2026, 22:52 UTC · via 8.8.8.8
✗Problems found
24 passed 2 warnings 1 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

avalon.iks-jena.de, broceliande.iks-jena.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
avalon.iks-jena.de, broceliande.iks-jena.de
NS in the zone
avalon.iks-jena.de, broceliande.iks-jena.de
NameserverAddressesNetwork (AS)Glue
avalon.iks-jena.de217.17.192.66 2001:4bd8:0:104:217:17:192:66AS15725 IKS - IKS Service GmbH, DE AS15725 IKS - IKS Service GmbH, DE217.17.192.66 2001:4bd8:0:104:217:17:192:66
broceliande.iks-jena.de217.17.207.133 2001:4bd8:52:1:20a:e4ff:fe80:bec8AS15725 IKS - IKS Service GmbH, DE AS199284 encoLine - Thueringer Netkom GmbH, DE217.17.207.133 2001:4bd8:52:1:20a:e4ff:fe80:bec8

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: avalon.iks-jena.de, broceliande.iks-jena.de.
    #6
  • ✓ 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: avalon.iks-jena.de, broceliande.iks-jena.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 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS15725 (IKS - IKS Service GmbH, DE): 3 addresses; AS199284 (encoLine - Thueringer Netkom GmbH, DE): 1 address.
  • 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

fail

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
avalon.iks-jena.de 217.17.192.66NOERROR, 21 ms, authoritativenoyes / yesALLOWED (4695 records)9.18.24
avalon.iks-jena.de 2001:4bd8:0:104:217:17:192:66NOERROR, 18 ms, authoritativenoyes / yesALLOWED (4695 records)9.18.24
broceliande.iks-jena.de 217.17.207.133NOERROR, 13 ms, authoritativenoyes / yesrefused-
broceliande.iks-jena.de 2001:4bd8:52:1:20a:e4ff:fe80:bec8NOERROR, 17 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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: avalon.iks-jena.de: "9.18.24". Hide or replace the version string.
    #17
  • ✗
    Zone transfer allowed
    These nameservers send the complete zone to anyone who asks (AXFR), exposing all host names: avalon.iks-jena.de (217.17.192.66): 4695 records; avalon.iks-jena.de (2001:4bd8:0:104:217:17:192:66): 4695 records. Restrict zone transfers to your secondary servers.
    #18
  • ✓ 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 2026101901 · primary avalon.iks-jena.de

Found

Primary (MNAME)
avalon.iks-jena.de
Contact (RNAME)
hostmaster.iks-jena.de
Serial
2026101901
Refresh / retry
28800 s / 3600 s
Expire
3600000 s
Negative TTL
57600 s

Serial per nameserver

NameserverSerial
avalon.iks-jena.de (217.17.192.66)2026101901
avalon.iks-jena.de (2001:4bd8:0:104:217:17:192:66)2026101901
broceliande.iks-jena.de (217.17.207.133)2026101901
broceliande.iks-jena.de (2001:4bd8:52:1:20a:e4ff:fe80:bec8)2026101901

Checks

  • ✓ Serial 2026101901 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 1h, expire 1000h, negative TTL 16h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver avalon.iks-jena.de is one of the listed nameservers.
  • ✓ Contact hostmaster@iks-jena.de #25
    The SOA RNAME hostmaster.iks-jena.de means hostmaster@iks-jena.de.
  • ✓ Date-based serial #26
    The serial 2026101901 follows the YYYYMMDDnn convention (2026-10-19).

DNSSEC

warn

Signed, DS published at parent

Found

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

DS at the parent

Key tagAlgorithmDigestMatches a key
12129RSASHA1 (5)SHA256 FC32E441467B9C35…yes

DNSKEY in the zone

Key tagRoleAlgorithm
12129KSK (257)RSASHA1 (5)
39332ZSK (256)RSASHA1 (5)

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 12129 (SHA256).
  • !
    Deprecated algorithm
    SHA-1 based algorithms are deprecated and rejected by some validators: RSASHA1 (5). Roll over to ECDSAP256SHA256 (13).
    #29
  • ✓ Signatures valid until 2026-11-07 #30
    The earliest DNSKEY/SOA signature expires at 2026-11-07 21:10 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

8 records at the apex

Found

Read from
217.17.192.66:53
TypeValueTTL
SOAavalon.iks-jena.de. hostmaster.iks-jena.de. 2026101901 28800 3600 3600000 5760057600
NSavalon.iks-jena.de.57600
NSbroceliande.iks-jena.de.57600
A217.17.192.6657600
MX10 excalibur.iks-jena.de.57600
MX20 avalon.iks-jena.de.57600
TXT"google-site-verification=tA7BtxY8L-5YIqxGsX778OMNrsLvBzviNLLblfF7HAE"57600
TXT"v=spf1 ip6:2001:4bd8::/48 ip4:217.17.192.0/24 a:mail.domain-robot.org -all"57600

Checks

  • ✓ TTLs within range #32
    TTLs: A 16h, MX 16h, NS 16h. The NS TTL at the parent is 1d and in the zone 16h; 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