tu-darmstadt.de

Checked 22 October 2026, 00:41 UTC · via 8.8.8.8
!Passed with warnings
27 passed 2 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

info

ans1.net.hrz.tu-darmstadt.de, ans2.net.hrz.tu-darmstadt.de, ans3.net.hrz.tu-darmstadt.de, ns1.man-da.de, ns2.man-da.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ans1.net.hrz.tu-darmstadt.de, ans2.net.hrz.tu-darmstadt.de, ans3.net.hrz.tu-darmstadt.de, ns1.man-da.de, ns2.man-da.de
NS in the zone
ans1.net.hrz.tu-darmstadt.de, ans2.net.hrz.tu-darmstadt.de, ans3.net.hrz.tu-darmstadt.de, ns1.man-da.de, ns2.man-da.de
NameserverAddressesNetwork (AS)Glue
ans1.net.hrz.tu-darmstadt.de130.83.22.61 2001:41b8:83f:22::61AS8365 MANDA - Man-da.de GmbH, DE AS8365 MANDA - Man-da.de GmbH, DE130.83.22.61 2001:41b8:83f:22::61
ans2.net.hrz.tu-darmstadt.de130.83.56.61 2001:41b8:83f:56::61AS8365 MANDA - Man-da.de GmbH, DE AS8365 MANDA - Man-da.de GmbH, DE130.83.56.61 2001:41b8:83f:56::61
ans3.net.hrz.tu-darmstadt.de78.46.221.77 2a01:4f8:c0c:4a66::77AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE78.46.221.77 2a01:4f8:c0c:4a66::77
ns1.man-da.de82.195.66.249 2001:41b8:0:1::53AS8365 MANDA - Man-da.de GmbH, DE AS8365 MANDA - Man-da.de GmbH, DE82.195.66.249 2001:41b8:0:1::53
ns2.man-da.de217.198.242.249 2001:4c80:0:7f1::249AS2857 RLP-NET - Johannes Gutenberg-Universitaet Mainz, DE AS2857 RLP-NET - Johannes Gutenberg-Universitaet Mainz, DE217.198.242.249 2001:4c80:0:7f1::249

Checks

  • ✓ 5 nameservers #6
    Delegated to ans1.net.hrz.tu-darmstadt.de, ans2.net.hrz.tu-darmstadt.de, ans3.net.hrz.tu-darmstadt.de, ns1.man-da.de, ns2.man-da.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: ans1.net.hrz.tu-darmstadt.de, ans2.net.hrz.tu-darmstadt.de, ans3.net.hrz.tu-darmstadt.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 5 IPv4 /24s and 4 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS24940 (HETZNER-AS - Hetzner Online GmbH, DE): 2 addresses; AS2857 (RLP-NET - Johannes Gutenberg-Universitaet Mainz, DE): 2 addresses; AS8365 (MANDA - Man-da.de GmbH, DE): 6 addresses.
  • 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

10 of 10 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ans1.net.hrz.tu-darmstadt.de 130.83.22.61NOERROR, 4 ms, authoritativenoyes / yesrefused-
ans1.net.hrz.tu-darmstadt.de 2001:41b8:83f:22::61NOERROR, 4 ms, authoritativenoyes / yesrefused-
ans2.net.hrz.tu-darmstadt.de 130.83.56.61NOERROR, 4 ms, authoritativenoyes / yesrefused-
ans2.net.hrz.tu-darmstadt.de 2001:41b8:83f:56::61NOERROR, 5 ms, authoritativenoyes / yesrefused-
ans3.net.hrz.tu-darmstadt.de 78.46.221.77NOERROR, 2 ms, authoritativenoyes / yesrefused-
ans3.net.hrz.tu-darmstadt.de 2a01:4f8:c0c:4a66::77NOERROR, 2 ms, authoritativenoyes / yesrefused-
ns1.man-da.de 82.195.66.249NOERROR, 5 ms, authoritativenoyes / yesrefusedKnot DNS 3.6.2
ns1.man-da.de 2001:41b8:0:1::53NOERROR, 5 ms, authoritativenoyes / yesrefusedKnot DNS 3.6.2
ns2.man-da.de 217.198.242.249NOERROR, 4 ms, authoritativenoyes / yesrefusedKnot DNS 3.6.2
ns2.man-da.de 2001:4c80:0:7f1::249NOERROR, 4 ms, authoritativenoyes / yesrefusedKnot DNS 3.6.2

Checks

  • ✓ All respond #14
    All 10 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: ns1.man-da.de: "Knot DNS 3.6.2"; ns2.man-da.de: "Knot DNS 3.6.2". 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 1112610201 · primary ans1.net.hrz.tu-darmstadt.de

Found

Primary (MNAME)
ans1.net.hrz.tu-darmstadt.de
Contact (RNAME)
hostmaster.net.hrz.tu-darmstadt.de
Serial
1112610201
Refresh / retry
21600 s / 3600 s
Expire
3600000 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ans1.net.hrz.tu-darmstadt.de (130.83.22.61)1112610201
ans1.net.hrz.tu-darmstadt.de (2001:41b8:83f:22::61)1112610201
ans2.net.hrz.tu-darmstadt.de (130.83.56.61)1112610201
ans2.net.hrz.tu-darmstadt.de (2001:41b8:83f:56::61)1112610201
ans3.net.hrz.tu-darmstadt.de (78.46.221.77)1112610201
ans3.net.hrz.tu-darmstadt.de (2a01:4f8:c0c:4a66::77)1112610201
ns1.man-da.de (82.195.66.249)1112610201
ns1.man-da.de (2001:41b8:0:1::53)1112610201
ns2.man-da.de (217.198.242.249)1112610201
ns2.man-da.de (2001:4c80:0:7f1::249)1112610201

Checks

  • ✓ Serial 1112610201 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 1h, expire 1000h, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ans1.net.hrz.tu-darmstadt.de is one of the listed nameservers.
  • ✓ Contact hostmaster@net.hrz.tu-darmstadt.de #25
    The SOA RNAME hostmaster.net.hrz.tu-darmstadt.de means hostmaster@net.hrz.tu-darmstadt.de.
  • ✓ Timestamp serial #26
    The serial 1112610201 is a Unix timestamp (2005-04-04 10:23 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC3
NSEC3
10 iterations, 16-byte salt
Signatures valid until
19 November 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
61222RSASHA256 (8)SHA256 E844484B70316FBD…yes

DNSKEY in the zone

Key tagRoleAlgorithm
61222KSK (257)RSASHA256 (8)
45928ZSK (256)RSASHA256 (8)

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 61222 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: RSASHA256 (8).
  • ✓ Signatures valid until 2026-11-19 #30
    The earliest DNSKEY/SOA signature expires at 2026-11-19 21:04 UTC.
  • !
    NSEC3 with extra iterations or salt
    NSEC3 uses 10 iterations and a 16-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.
    #31

Records

info

17 records at the apex

Found

Read from
130.83.22.61:53
TypeValueTTL
SOAans1.net.hrz.tu-darmstadt.de. hostmaster.net.hrz.tu-darmstadt.de. 1112610201 21600 3600 3600000 8640086400
NSns1.man-da.de.86400
NSans1.net.hrz.tu-darmstadt.de.86400
NSans2.net.hrz.tu-darmstadt.de.86400
NSans3.net.hrz.tu-darmstadt.de.86400
NSns2.man-da.de.86400
A130.83.47.24586400
AAAA2001:41b8:83f:1604::47:24586400
MX10 b2681.mx.srv.dfn.de.86400
MX10 c2681.mx.srv.dfn.de.86400
MX10 a2681.mx.srv.dfn.de.86400
TXT"v=spf1 include:_spf.tu-darmstadt.de ?all"86400
TXT"ZOOM_verify_9c8RCWNZTp2A1REBULIWUw"86400
TXT"sophos-domain-verification=58b09958937bb5c99066d94fff466d8f72c294549b004ea1f7fa35a3aa0785be"86400
TXT"google-site-verification=MhVJ4YhH6BFMk3VMQ_okf6dDKl64kAu05XQt9F__0qY"86400
TXT"MS=3DB65728A46A4ECFAF5F4A714F39661E1CA144CE"86400
TXT"brevo-code:b06168a0ae0d70ff4bd469302deabf93"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, AAAA 1d, MX 1d, 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