oberberg-aktuell.de

Checked 21 October 2026, 23:41 UTC · via 8.8.8.8
✗Problems found
20 passed 2 warnings 2 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

warn

ns.oberberg-online.de, ns2.oberberg-online.de, ns3.oberberg-online.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.oberberg-online.de, ns2.oberberg-online.de, ns3.oberberg-online.de
NS in the zone
ns.oberberg-online.de, ns2.oberberg-online.de, ns3.oberberg-online.de
NameserverAddressesNetwork (AS)Glue
ns.oberberg-online.de212.102.225.2 2a00:aa40:0:225::2AS15415 OBIS - Oberberg-Online Informationssysteme GmbH, DE AS15415 OBIS - Oberberg-Online Informationssysteme GmbH, DE212.102.225.2
ns2.oberberg-online.de85.214.213.241 2a01:238:43cf:700:b20a:9b73:da52:bc7dAS6724 STRATO - Strato GmbH, DE AS6724 STRATO - Strato GmbH, DE-
ns3.oberberg-online.de89.200.168.203AS25504 CRONON-AS - Vautron Rechenzentrum AG, DE89.200.168.203

Checks

  • ✓ 3 nameservers #6
    Delegated to ns.oberberg-online.de, ns2.oberberg-online.de, ns3.oberberg-online.de.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • !
    Glue differs from the zone
    The addresses at the parent (glue) differ from the addresses in the zone: ns.oberberg-online.de (glue 212.102.225.2, zone 212.102.225.2, 2a00:aa40:0:225::2). Update the glue at your registrar.
    #8
  • ✓ 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.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS15415 (OBIS - Oberberg-Online Informationssysteme GmbH, DE): 2 addresses; AS25504 (CRONON-AS - Vautron Rechenzentrum AG, DE): 1 address; AS6724 (STRATO - Strato GmbH, DE): 2 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: ns3.oberberg-online.de.
    #13

Nameservers

fail

4 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.oberberg-online.de 212.102.225.2NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns.oberberg-online.de 2a00:aa40:0:225::2NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns2.oberberg-online.de 85.214.213.241NOERROR, 20 ms, authoritativenoyes / yesrefused-
ns2.oberberg-online.de 2a01:238:43cf:700:b20a:9b73:da52:bc7dNOERROR, 20 ms, authoritativenoyes / yesrefused-
ns3.oberberg-online.de 89.200.168.203REFUSED, 13 ms, NOT authoritativenono / yesrefused-

Checks

  • ✓ All respond #14
    All 5 nameserver addresses answered.
  • ✗
    Lame delegation
    These nameservers don't answer authoritatively for the zone, so resolvers ignore them: ns3.oberberg-online.de (89.200.168.203): REFUSED, authoritative=false.
    #15
  • ✓ 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.
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: ns3.oberberg-online.de (89.200.168.203): .
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 2026082703 · primary ns.oberberg-online.de

Found

Primary (MNAME)
ns.oberberg-online.de
Contact (RNAME)
hostmaster.oberberg.net
Serial
2026082703
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns.oberberg-online.de (212.102.225.2)2026082703
ns.oberberg-online.de (2a00:aa40:0:225::2)2026082703
ns2.oberberg-online.de (85.214.213.241)2026082703
ns2.oberberg-online.de (2a01:238:43cf:700:b20a:9b73:da52:bc7d)2026082703

Checks

  • ✓ Serial 2026082703 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.oberberg-online.de is one of the listed nameservers.
  • ✓ Contact hostmaster@oberberg.net #25
    The SOA RNAME hostmaster.oberberg.net means hostmaster@oberberg.net.
  • ✓ Date-based serial #26
    The serial 2026082703 follows the YYYYMMDDnn convention (2026-08-27).

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

13 records at the apex

Found

Read from
212.102.225.2:53
TypeValueTTL
SOAns.oberberg-online.de. hostmaster.oberberg.net. 2026082703 28800 7200 604800 36003600
NSns3.oberberg-online.de.3600
NSns2.oberberg-online.de.3600
NSns.oberberg-online.de.3600
A212.102.231.176300
MX20 mx20.oberberg.net.3600
MX10 fm01.oberberg.net.3600
TXT"google-site-verification=gUq_6wMxsQ7h7g3w0O24xKPIexnN93KgWKSlNqLbOpA"3600
TXT"201904251319174bgo0q2n04v44k0grnqglb44uocusvkr001c2lb3nij5vj22dh"3600
TXT"duo_sso_verification=FlLUx5ar4vIqZiEoWbQrYAtITbuMfoeRAasianZxnS6QxoFOB1LWeaCvxkTFTvW2"3600
TXT"google-site-verification=VQuQaLyQ9O7HrdsVWd4PJReUNOWZMgNjaU_giH0_em8"3600
TXT"google-site-verification=JNde53jb8Sbh5s1BGR2wRPNDCAHGCCL25Br8Ci2_-3Q"3600
TXT"v=spf1 include:_spf.oberberg.net -all"3600

Checks

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