dvb.de

Checked 21 October 2026, 22:15 UTC · via 8.8.8.8
!Passed with warnings
24 passed 1 warning 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

ans-01.ibh.net, ans-02.ibh.net, ans-03.ibh.net, ans-04.ibh.net, ans-05.ibh.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ans-01.ibh.net, ans-02.ibh.net, ans-03.ibh.net, ans-04.ibh.net, ans-05.ibh.net
NS in the zone
ans-01.ibh.net, ans-02.ibh.net, ans-03.ibh.net, ans-04.ibh.net, ans-05.ibh.net
NameserverAddressesNetwork (AS)Glue
ans-01.ibh.net212.111.228.50 2a01:7700:0:1035::1:50AS15372 IBH-AS - IBH connect GmbH, DE AS15372 IBH-AS - IBH connect GmbH, DE-
ans-02.ibh.net193.36.123.50 2a01:7700:0:1036::1:50AS15372 IBH-AS - IBH connect GmbH, DE AS15372 IBH-AS - IBH connect GmbH, DE-
ans-03.ibh.net195.30.105.203 2001:608:c00:10::1:138AS5539 SPACENET - SpaceNet AG, DE AS5539 SPACENET - SpaceNet AG, DE-
ans-04.ibh.net167.235.139.88 2a01:4f8:c0c:74b9::1AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE-
ans-05.ibh.net65.109.1.68 2a01:4f9:c012:61fd::1AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE-

Checks

  • ✓ 5 nameservers #6
    Delegated to ans-01.ibh.net, ans-02.ibh.net, ans-03.ibh.net, ans-04.ibh.net, ans-05.ibh.net.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ No glue needed #8
    All nameservers are outside the zone, so no glue records are needed.
  • ✓ 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: AS15372 (IBH-AS - IBH connect GmbH, DE): 4 addresses; AS24940 (HETZNER-AS - Hetzner Online GmbH, DE): 4 addresses; AS5539 (SPACENET - SpaceNet AG, DE): 2 addresses.
  • i
    All nameserver names under .net
    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

info

10 of 10 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ans-01.ibh.net 212.111.228.50NOERROR, 6 ms, authoritativenoyes / yesrefusedIBH Authorative Name Server
ans-01.ibh.net 2a01:7700:0:1035::1:50NOERROR, 10 ms, authoritativenoyes / yesrefusedIBH Authorative Name Server
ans-02.ibh.net 193.36.123.50NOERROR, 7 ms, authoritativenoyes / yesrefusedIBH Authorative Name Server
ans-02.ibh.net 2a01:7700:0:1036::1:50NOERROR, 10 ms, authoritativenoyes / yesrefusedIBH Authorative Name Server
ans-03.ibh.net 195.30.105.203NOERROR, 10 ms, authoritativenoyes / yesrefusedIBH Authorative Name Server
ans-03.ibh.net 2001:608:c00:10::1:138NOERROR, 13 ms, authoritativenoyes / yesrefusedIBH Authorative Name Server
ans-04.ibh.net 167.235.139.88NOERROR, 1 ms, authoritativenoyes / yesrefusedIBH Authorative Name Server
ans-04.ibh.net 2a01:4f8:c0c:74b9::1NOERROR, 1 ms, authoritativenoyes / yesrefusedIBH Authorative Name Server
ans-05.ibh.net 65.109.1.68NOERROR, 24 ms, authoritativenoyes / yesrefusedIBH Authorative Name Server
ans-05.ibh.net 2a01:4f9:c012:61fd::1NOERROR, 24 ms, authoritativenoyes / yesrefusedIBH Authorative Name Server

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: ans-01.ibh.net: "IBH Authorative Name Server"; ans-02.ibh.net: "IBH Authorative Name Server"; ans-03.ibh.net: "IBH Authorative Name Server"; ans-04.ibh.net: "IBH Authorative Name Server"; ans-05.ibh.net: "IBH Authorative Name Server".
    #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 2026092401 · primary ans-01.ibh.net

Found

Primary (MNAME)
ans-01.ibh.net
Contact (RNAME)
hostmaster.dresden-it.de
Serial
2026092401
Refresh / retry
14400 s / 3600 s
Expire
604800 s
Negative TTL
10800 s

Serial per nameserver

NameserverSerial
ans-01.ibh.net (212.111.228.50)2026092401
ans-01.ibh.net (2a01:7700:0:1035::1:50)2026092401
ans-02.ibh.net (193.36.123.50)2026092401
ans-02.ibh.net (2a01:7700:0:1036::1:50)2026092401
ans-03.ibh.net (195.30.105.203)2026092401
ans-03.ibh.net (2001:608:c00:10::1:138)2026092401
ans-04.ibh.net (167.235.139.88)2026092401
ans-04.ibh.net (2a01:4f8:c0c:74b9::1)2026092401
ans-05.ibh.net (65.109.1.68)2026092401
ans-05.ibh.net (2a01:4f9:c012:61fd::1)2026092401

Checks

  • ✓ Serial 2026092401 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 1h, expire 7d, negative TTL 3h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ans-01.ibh.net is one of the listed nameservers.
  • ✓ Contact hostmaster@dresden-it.de #25
    The SOA RNAME hostmaster.dresden-it.de means hostmaster@dresden-it.de.
  • ✓ Date-based serial #26
    The serial 2026092401 follows the YYYYMMDDnn convention (2026-09-24).

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

pass

12 records at the apex

Found

Read from
212.111.228.50:53
TypeValueTTL
SOAans-01.ibh.net. hostmaster.dresden-it.de. 2026092401 14400 3600 604800 108003600
NSans-05.ibh.net.3600
NSans-01.ibh.net.3600
NSans-03.ibh.net.3600
NSans-02.ibh.net.3600
NSans-04.ibh.net.3600
A194.113.120.583600
MX0 dvbag-de.mail.protection.outlook.com.3600
TXT"v=spf1 ip4:194.113.120.0/21 include:spf.protection.outlook.com -all"3600
CAA0 issuewild "digicert.com"3600
CAA0 issue "digicert.com"3600
CAA0 issue "letsencrypt.org"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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: digicert.com, letsencrypt.org.