ix.de

Checked 21 October 2026, 23:00 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

info

ns.heise.de, ns.pop-hannover.de, ns2.pop-hannover.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.heise.de, ns.pop-hannover.de, ns2.pop-hannover.net
NS in the zone
ns.heise.de, ns.pop-hannover.de, ns2.pop-hannover.net
NameserverAddressesNetwork (AS)Glue
ns.heise.de193.99.145.37 2a00:e68:14:800::d1ceAS15743 NETDE - net.de AG, DE AS15743 NETDE - net.de AG, DE193.99.145.37 2a00:e68:14:800::d1ce
ns.pop-hannover.de193.98.1.200 2a00:e68::2AS15743 NETDE - net.de AG, DE AS15743 NETDE - net.de AG, DE193.98.1.200 2a00:e68::2
ns2.pop-hannover.net62.48.67.66 2a00:e68:0:2::6AS15743 NETDE - net.de AG, DE AS15743 NETDE - net.de AG, DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to ns.heise.de, ns.pop-hannover.de, ns2.pop-hannover.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 3 IPv4 /24s and 2 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS15743 (NETDE - net.de AG, DE): 6 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .net.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.heise.de 193.99.145.37NOERROR, 12 ms, authoritativenoyes / yesrefused-
ns.heise.de 2a00:e68:14:800::d1ceNOERROR, 12 ms, authoritativenoyes / yesrefused-
ns.pop-hannover.de 193.98.1.200NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns.pop-hannover.de 2a00:e68::2NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns2.pop-hannover.net 62.48.67.66NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns2.pop-hannover.net 2a00:e68:0:2::6NOERROR, 11 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.
  • ✓ 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.
  • ✓ 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 2026090104 · primary ns.heise.de

Found

Primary (MNAME)
ns.heise.de
Contact (RNAME)
hostmaster.heise.de
Serial
2026090104
Refresh / retry
14400 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns.heise.de (193.99.145.37)2026090104
ns.heise.de (2a00:e68:14:800::d1ce)2026090104
ns.pop-hannover.de (193.98.1.200)2026090104
ns.pop-hannover.de (2a00:e68::2)2026090104
ns2.pop-hannover.net (62.48.67.66)2026090104
ns2.pop-hannover.net (2a00:e68:0:2::6)2026090104

Checks

  • ✓ Serial 2026090104 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 1h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.heise.de is one of the listed nameservers.
  • ✓ Contact hostmaster@heise.de #25
    The SOA RNAME hostmaster.heise.de means hostmaster@heise.de.
  • ✓ Date-based serial #26
    The serial 2026090104 follows the YYYYMMDDnn convention (2026-09-01).

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

17 records at the apex

Found

Read from
193.99.145.37:53
TypeValueTTL
SOAns.heise.de. hostmaster.heise.de. 2026090104 14400 3600 604800 8640086400
NSns2.pop-hannover.net.86400
NSns.pop-hannover.de.86400
NSns.heise.de.86400
A193.99.144.8086400
AAAA2a02:2e0:3fe:1001:302::86400
MX40 mx04.hornetsecurity.com.86400
MX10 mx01.hornetsecurity.com.86400
MX20 mx02.hornetsecurity.com.86400
MX30 mx03.hornetsecurity.com.86400
TXT"miro-verification=601d1e3e9623fe2102de9d6d215a2380ae5c69bd"86400
TXT"google-site-verification=rl5_MgtznPihF-qU1P2BrRbrYMd6ohTHujdbRYq4H5Y"86400
TXT"v=spf1 ip4:193.99.144.0/24 ip4:193.99.145.0/24 ip6:2a02:2e0:3fe:1001::/64 ip6:2a00:e68:14:800::/64 include:spf.hornetsecurity.com include:spf.protection.outlook.com ?all"86400
CAA0 iodef "mailto:hostmaster@heise.de"86400
CAA0 issue "letsencrypt.org"86400
CAA0 issuewild ";"86400
CAA0 issue "amazon.com"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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: letsencrypt.org, none (issuance forbidden), amazon.com.