Domain report: hannover-stadt.de

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.
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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.htp-tel.de, ns01.hannover-stadt.de, ns02.hannover-stadt.de, ns1.htp-tel.de, ns2.htp-tel.de

Found

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: ns.htp-tel.de, ns01.hannover-stadt.de, ns02.hannover-stadt.de, ns1.htp-tel.de, ns2.htp-tel.de
NS in the zone: ns.htp-tel.de, ns01.hannover-stadt.de, ns02.hannover-stadt.de, ns1.htp-tel.de, ns2.htp-tel.de

Nameserver	Addresses	Network (AS)	Glue
ns.htp-tel.de	81.14.244.10 2a02:560:2:140::10	AS13045 HTP-AS - htp GmbH, DE AS13045 HTP-AS - htp GmbH, DE	81.14.244.10 2a02:560:2:140::10
ns01.hannover-stadt.de	212.59.55.202	AS13045 HTP-AS - htp GmbH, DE	212.59.55.202
ns02.hannover-stadt.de	212.59.55.203	AS13045 HTP-AS - htp GmbH, DE	212.59.55.203
ns1.htp-tel.de	81.14.243.10 2a02:560:2:100::10	AS13045 HTP-AS - htp GmbH, DE AS13045 HTP-AS - htp GmbH, DE	81.14.243.10 2a02:560:2:100::10
ns2.htp-tel.de	212.59.54.188 2a02:560:2:180::10	AS13045 HTP-AS - htp GmbH, DE AS13045 HTP-AS - htp GmbH, DE	212.59.54.188 2a02:560:2:180::10

Checks

✓ 5 nameservers #6

Delegated to ns.htp-tel.de, ns01.hannover-stadt.de, ns02.hannover-stadt.de, ns1.htp-tel.de, ns2.htp-tel.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: ns01.hannover-stadt.de, ns02.hannover-stadt.de.
✓ All names resolve #9

Every nameserver name has an address and is not an alias.
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One address family in one network

all IPv6 addresses are in 2a02:560:2::/48, while the other address family is spread over several networks.

#10
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All nameservers in one AS

All nameserver addresses are announced by one network operator (AS13045 (HTP-AS - htp GmbH, DE): 8 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.

#11
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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
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Partly IPv6

These nameservers have no IPv6 address: ns01.hannover-stadt.de, ns02.hannover-stadt.de.

#13

Nameservers

warn

8 of 8 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns.htp-tel.de 81.14.244.10	NOERROR, 10 ms, authoritative	no	yes / yes	refused	-
ns.htp-tel.de 2a02:560:2:140::10	NOERROR, 10 ms, authoritative	no	yes / yes	refused	-
ns01.hannover-stadt.de 212.59.55.202	NOERROR, 10 ms, authoritative	no	yes / yes	refused	9.18.39-0ubuntu0.22.04.7-Ubuntu
ns02.hannover-stadt.de 212.59.55.203	NOERROR, 10 ms, authoritative	no	yes / yes	refused	9.18.39-0ubuntu0.24.04.8-Ubuntu
ns1.htp-tel.de 81.14.243.10	NOERROR, 9 ms, authoritative	no	yes / yes	refused	-
ns1.htp-tel.de 2a02:560:2:100::10	NOERROR, 10 ms, authoritative	no	yes / yes	refused	-
ns2.htp-tel.de 212.59.54.188	NOERROR, 10 ms, authoritative	no	yes / yes	refused	-
ns2.htp-tel.de 2a02:560:2:180::10	NOERROR, 10 ms, authoritative	no	yes / yes	refused	-

Checks

✓ All respond #14

All 8 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.
!

Software version disclosed

These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns01.hannover-stadt.de: "9.18.39-0ubuntu0.22.04.7-Ubuntu"; ns02.hannover-stadt.de: "9.18.39-0ubuntu0.24.04.8-Ubuntu". Hide or replace the version string.

#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 2010112610 · primary ns01.hannover-stadt.de

Found

Primary (MNAME): ns01.hannover-stadt.de
Contact (RNAME): hostmaster.hannover-stadt.de
Serial: 2010112610
Refresh / retry: 10800 s / 1800 s
Expire: 2592000 s
Negative TTL: 86400 s

Serial per nameserver

Nameserver	Serial
ns.htp-tel.de (81.14.244.10)	2010112610
ns.htp-tel.de (2a02:560:2:140::10)	2010112610
ns01.hannover-stadt.de (212.59.55.202)	2010112610
ns02.hannover-stadt.de (212.59.55.203)	2010112610
ns1.htp-tel.de (81.14.243.10)	2010112610
ns1.htp-tel.de (2a02:560:2:100::10)	2010112610
ns2.htp-tel.de (212.59.54.188)	2010112610
ns2.htp-tel.de (2a02:560:2:180::10)	2010112610

Checks

✓ Serial 2010112610 everywhere #22

All nameservers serve the same version of the zone.
✓ Timers within recommendations #23

SOA refresh 3h, retry 30m, expire 30d, negative TTL 1d.
✓ Primary is a public nameserver #24

The primary nameserver ns01.hannover-stadt.de is one of the listed nameservers.
✓ Contact hostmaster@hannover-stadt.de #25

The SOA RNAME hostmaster.hannover-stadt.de means hostmaster@hannover-stadt.de.
✓ Date-based serial #26

The serial 2010112610 follows the YYYYMMDDnn convention (2010-11-26).

DNSSEC

pass

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 0 iterations, 0-byte salt
Signatures valid until: 8 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
1612	RSASHA256 (8)	SHA256 67BDE463C3FE1E58…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
32985	ZSK (256)	RSASHA256 (8)
1612	KSK (257)	RSASHA256 (8)

Checks

✓ Signed and validated #27

The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
✓ DS matches a key #28

The DS record at the parent matches a key in the zone: key tag 1612 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Signatures valid until 2026-11-08 #30

The earliest DNSKEY/SOA signature expires at 2026-11-08 04:15 UTC.
✓ NSEC3 as recommended #31

The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

warn

18 records at the apex

Found

Read from: 81.14.244.10:53

Type	Value	TTL
SOA	ns01.hannover-stadt.de. hostmaster.hannover-stadt.de. 2010112610 10800 1800 2592000 86400	86400
NS	ns.htp-tel.de.	86400
NS	ns1.htp-tel.de.	86400
NS	ns01.hannover-stadt.de.	86400
NS	ns2.htp-tel.de.	86400
NS	ns02.hannover-stadt.de.	86400
A	212.59.55.0	86400
MX	100 dmzmailgw04.hannover-stadt.de.	60
MX	100 dmzmailgw03.hannover-stadt.de.	60
TXT	"MS=ms29313936"	86400
TXT	"autodesk-domain-verification=8ZV43C2eQt8LIAXCaukr"	86400
TXT	"MS=0A4F0FFDD599DDEBCFEF769A64475FB0B5E7ED5C"	86400
TXT	"adobe-idp-site-verification=c5eba24dcc86a2b95db51cc8c18462304ebd7fedee129e5048fc271b37ea5c28"	86400
TXT	"apple-domain-verification=lLoKLqdIxsGPRyc6"	86400
TXT	"v=spf1 mx ip4:192.109.36.75 ip4:192.109.36.76 ip4:192.109.36.85 ip4:192.109.36.86 ip4:212.59.55.87 include:spf.mxg.cloud include:ekom21.de -all"	86400
TXT	"c9r83m8n3b1knlhrb5vwcvdxkq3rrqfn"	86400
TXT	"google-site-verification=1Qp1HU9VqyD74v8_ak4d6qSsy_CwBGyD5V427ZiJ-UE"	86400
TXT	"cisco-ci-domain-verification=2cca390de45cc48b1325b11bdec6c6fc34df35ab1a7e1d04efbb575a5826c07f"	86400

Checks

!

Very low TTLs

These records have a TTL below 5m, causing extra queries and slower lookups: MX (1m). Low TTLs are useful just before a planned change.

#32
✓ No CNAME at the apex #33

The zone apex has no CNAME record.
✓ No wildcard #34

Names that don't exist return NXDOMAIN.
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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