semperoper.de

Checked 22 October 2026, 00:10 UTC · via 8.8.8.8
!Passed with warnings
25 passed 1 warning 0 failed 3 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

pass

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

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ans-01.ibh.de, ans-02.ibh.net, ans-03.ibh.de, ans-04.ibh.services, ans-05.ibh.net
NS in the zone
ans-01.ibh.de, ans-02.ibh.net, ans-03.ibh.de, ans-04.ibh.services, ans-05.ibh.net
NameserverAddressesNetwork (AS)Glue
ans-01.ibh.de212.111.228.50 2a01:7700:0:1035::1:50AS15372 IBH-AS - IBH connect GmbH, DE AS15372 IBH-AS - IBH connect GmbH, DE212.111.228.50 2a01:7700:0:1035::1:50
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.de195.30.105.203 2001:608:c00:10::1:138AS5539 SPACENET - SpaceNet AG, DE AS5539 SPACENET - SpaceNet AG, DE195.30.105.203 2001:608:c00:10::1:138
ans-04.ibh.services167.235.139.88 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.de, ans-02.ibh.net, ans-03.ibh.de, ans-04.ibh.services, 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.
  • ✓ Nameserver names under 3 TLDs #12
    Nameserver names use the TLDs .de, .net, .services.
  • ✓ 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.de 212.111.228.50NOERROR, 6 ms, authoritativenoyes / yesrefusedIBH Authorative Name Server
ans-01.ibh.de 2a01:7700:0:1035::1:50NOERROR, 10 ms, authoritativenoyes / yesrefusedIBH Authorative Name Server
ans-02.ibh.net 193.36.123.50NOERROR, 6 ms, authoritativenoyes / yesrefusedIBH Authorative Name Server
ans-02.ibh.net 2a01:7700:0:1036::1:50NOERROR, 7 ms, authoritativenoyes / yesrefusedIBH Authorative Name Server
ans-03.ibh.de 195.30.105.203NOERROR, 11 ms, authoritativenoyes / yesrefusedIBH Authorative Name Server
ans-03.ibh.de 2001:608:c00:10::1:138NOERROR, 11 ms, authoritativenoyes / yesrefusedIBH Authorative Name Server
ans-04.ibh.services 167.235.139.88NOERROR, 1 ms, authoritativenoyes / yesrefusedIBH Authorative Name Server
ans-04.ibh.services 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.de: "IBH Authorative Name Server"; ans-02.ibh.net: "IBH Authorative Name Server"; ans-03.ibh.de: "IBH Authorative Name Server"; ans-04.ibh.services: "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 2026091700 · primary ans-01.ibh.de

Found

Primary (MNAME)
ans-01.ibh.de
Contact (RNAME)
hostmaster.ibh.net
Serial
2026091700
Refresh / retry
3600 s / 1200 s
Expire
3600000 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
ans-01.ibh.de (212.111.228.50)2026091700
ans-01.ibh.de (2a01:7700:0:1035::1:50)2026091700
ans-02.ibh.net (193.36.123.50)2026091700
ans-02.ibh.net (2a01:7700:0:1036::1:50)2026091700
ans-03.ibh.de (195.30.105.203)2026091700
ans-03.ibh.de (2001:608:c00:10::1:138)2026091700
ans-04.ibh.services (167.235.139.88)2026091700
ans-04.ibh.services (2a01:4f8:c0c:74b9::1)2026091700
ans-05.ibh.net (65.109.1.68)2026091700
ans-05.ibh.net (2a01:4f9:c012:61fd::1)2026091700

Checks

  • ✓ Serial 2026091700 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 20m, expire 1000h, negative TTL 10m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ans-01.ibh.de is one of the listed nameservers.
  • ✓ Contact hostmaster@ibh.net #25
    The SOA RNAME hostmaster.ibh.net means hostmaster@ibh.net.
  • ✓ Date-based serial #26
    The serial 2026091700 follows the YYYYMMDDnn convention (2026-09-17).

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

22 records at the apex

Found

Read from
212.111.228.50:53
TypeValueTTL
SOAans-01.ibh.de. hostmaster.ibh.net. 2026091700 3600 1200 3600000 6003600
NSans-04.ibh.services.3600
NSans-03.ibh.de.3600
NSans-05.ibh.net.3600
NSans-02.ibh.net.3600
NSans-01.ibh.de.3600
A212.111.227.101300
MX20 mx-02-eu-central-1.prod.hydra.sophos.com.86400
MX10 mx-01-eu-central-1.prod.hydra.sophos.com.86400
TXT"adobe-idp-site-verification=5d828947-4392-476c-9f47-fcfbedc95a58"300
TXT"MS=ms39666904"300
TXT"globalsign-domain-verification=ekZODiQCMUguELTmLUZoG10hiLTAeRIVh2G2_N6kRE"300
TXT"sophos-domain-verification=22e6fba1ed525cb72357b68e06f2850bf29c11df25cb7bbf193d568fb5f138f6"300
TXT"v=spf1 mx ip4:212.111.227.100/30 ip4:212.111.227.104 ip4:212.111.239.113 ip4:212.111.239.120 ip4:94.186.153.20/31 ip4:94.186.157.82 ip4:74.203.57.45 ip4:74.203.49.181 ip4:74.203.49.182 ip4:74.203.49.183 ip4:74.203.49.184 ip4:74.203.49.185 ip4:74.203.49.51" " ip4:74.203.49.187 ip4:74.203.49.188 ip4:74.203.49.189 ip4:74.203.49.190 ip4:159.195.59.66 ip6:2a0a:4cc0:c1:ec0f:7872:6eff:fec6:83d4 include:_spf_eucentral1.prod.hydra.sophos.com -all"300
TXT"brevo-code:53d9d93ba7018ba9f8591bb9d273085d"300
TXT"sophos-domain-verification=456e737f25e5c2297828c7f8c7d09d1e77fd86ed"300
TXT"apple-domain-verification=gdTQwia3q0yOnTgX"300
CAA0 issuewild "globalsign.com"3600
CAA0 issue "letsencrypt.org"3600
CAA0 issue "globalsign.com"3600
CAA0 issuewild "letsencrypt.org"3600
CAA0 iodef "mailto:hostmaster@ibh.net"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 1d, 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: globalsign.com, letsencrypt.org.