wias-berlin.de

Checked 22 October 2026, 01:00 UTC · via 8.8.8.8
!Passed with warnings
21 passed 2 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

deneb.dfn.de, dns-2.dfn.de, lagrange.wias-berlin.de, laplace.wias-berlin.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
deneb.dfn.de, dns-2.dfn.de, lagrange.wias-berlin.de, laplace.wias-berlin.de
NS in the zone
deneb.dfn.de, dns-2.dfn.de, lagrange.wias-berlin.de, laplace.wias-berlin.de
NameserverAddressesNetwork (AS)Glue
deneb.dfn.de192.76.176.9 2001:638:800:1::9AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
dns-2.dfn.de193.174.75.54 2001:638:d:b102::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
lagrange.wias-berlin.de62.141.177.1AS20588 FVB - Forschungsverbund Berlin e.V., DE62.141.177.1
laplace.wias-berlin.de62.141.177.2AS20588 FVB - Forschungsverbund Berlin e.V., DE62.141.177.2

Checks

  • ✓ 4 nameservers #6
    Delegated to deneb.dfn.de, dns-2.dfn.de, lagrange.wias-berlin.de, laplace.wias-berlin.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: lagrange.wias-berlin.de, laplace.wias-berlin.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 3 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS20588 (FVB - Forschungsverbund Berlin e.V., DE): 2 addresses; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 4 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: lagrange.wias-berlin.de, laplace.wias-berlin.de.
    #13

Nameservers

info

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
deneb.dfn.de 192.76.176.9NOERROR, 14 ms, authoritativenoyes / yesrefused0
deneb.dfn.de 2001:638:800:1::9NOERROR, 14 ms, authoritativenoyes / yesrefused0
dns-2.dfn.de 193.174.75.54NOERROR, 7 ms, authoritativenoyes / yesrefused0
dns-2.dfn.de 2001:638:d:b102::1NOERROR, 7 ms, authoritativenoyes / yesrefused0
lagrange.wias-berlin.de 62.141.177.1NOERROR, 26 ms, authoritativenoyes / yesrefused-
laplace.wias-berlin.de 62.141.177.2NOERROR, 29 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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: deneb.dfn.de: "0"; dns-2.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 2026102001 · primary lagrange.wias-berlin.de

Found

Primary (MNAME)
lagrange.wias-berlin.de
Contact (RNAME)
hostmaster.wias-berlin.de
Serial
2026102001
Refresh / retry
21600 s / 2700 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
deneb.dfn.de (192.76.176.9)2026102001
deneb.dfn.de (2001:638:800:1::9)2026102001
dns-2.dfn.de (193.174.75.54)2026102001
dns-2.dfn.de (2001:638:d:b102::1)2026102001
lagrange.wias-berlin.de (62.141.177.1)2026102001
laplace.wias-berlin.de (62.141.177.2)2026102001

Checks

  • ✓ Serial 2026102001 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 45m, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver lagrange.wias-berlin.de is one of the listed nameservers.
  • ✓ Contact hostmaster@wias-berlin.de #25
    The SOA RNAME hostmaster.wias-berlin.de means hostmaster@wias-berlin.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

warn

14 records at the apex

Found

Read from
192.76.176.9:53
TypeValueTTL
SOAlagrange.wias-berlin.de. hostmaster.wias-berlin.de. 2026102001 21600 2700 604800 360060
NSlagrange.wias-berlin.de.60
NSdeneb.dfn.de.60
NSdns-2.dfn.de.60
NSlaplace.wias-berlin.de.60
A62.141.177.11160
MX20 c1926.mx.srv.dfn.de.60
MX20 b1926.mx.srv.dfn.de.60
MX20 a1926.mx.srv.dfn.de.60
TXT"google-site-verification=_HokxaWilSpFeqOhtX6h57H1zCh6D9Nf7h9ii2ggnl4"60
TXT"adobe-idp-site-verification=fe9d9a6950fc8e7fca3c3fce3d7059c72385c67f5bc6f53442386b2b6e2c1e13"60
TXT"MS=B46DC3079AB1A0AD890FFEB51D82D8FB109461BC"60
TXT"HARICA-uQKZXd6v2hrlNEsDk8t"60
TXT"v=spf1 +mx +ip4:62.141.177.90 +ip4:62.141.176.103 +a:smtp.wias-berlin.de +a:smtp.mathunion.org ~all"60

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (1m), MX (1m), NS (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1d and in the zone 1m; resolvers may use either.
    #32
  • ✓ 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