Domain report: do.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.
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

ns1.mainns.de, ns2.mainns.eu, ns3.mainns.net

Found

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: ns1.mainns.de, ns2.mainns.eu, ns3.mainns.net
NS in the zone: ns1.mainns.de, ns2.mainns.eu, ns3.mainns.net

Nameserver	Addresses	Network (AS)	Glue
ns1.mainns.de	192.174.68.21 2001:67c:1bc::21	AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT	192.174.68.21 2001:67c:1bc::21
ns2.mainns.eu	176.97.158.21 2001:67c:10b8::21	AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT	-
ns3.mainns.net	192.174.68.20 2001:67c:1bc::20	AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT	-

Checks

✓ 3 nameservers #6

Delegated to ns1.mainns.de, ns2.mainns.eu, ns3.mainns.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 2 IPv4 /24s and 2 IPv6 /48s.
i

All nameservers in one AS

All nameserver addresses are announced by one network operator (AS1921 (RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT): 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 3 TLDs #12

Nameserver names use the TLDs .de, .eu, .net.
✓ All reachable over IPv6 #13

Every nameserver has an IPv6 address.

Nameservers

info

6 of 6 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.mainns.de 192.174.68.21	NOERROR, 3 ms, authoritative	no	yes / yes	refused	RcodeZero DNS
ns1.mainns.de 2001:67c:1bc::21	NOERROR, 7 ms, authoritative	no	yes / yes	refused	RcodeZero DNS
ns2.mainns.eu 176.97.158.21	NOERROR, 12 ms, authoritative	no	yes / yes	refused	reg-wie1
ns2.mainns.eu 2001:67c:10b8::21	NOERROR, 16 ms, authoritative	no	yes / yes	refused	reg-wie1
ns3.mainns.net 192.174.68.20	NOERROR, 4 ms, authoritative	no	yes / yes	refused	RcodeZero DNS
ns3.mainns.net 2001:67c:1bc::20	NOERROR, 7 ms, authoritative	no	yes / yes	refused	RcodeZero DNS

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.
i

Identifying string disclosed

These nameservers answer version queries with a string that is not a version number: ns1.mainns.de: "RcodeZero DNS"; ns2.mainns.eu: "reg-wie1"; ns3.mainns.net: "RcodeZero DNS".

#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

warn

serial 1792575254 · primary ns1.mainns.de

Found

Primary (MNAME): ns1.mainns.de
Contact (RNAME): info.domains.resellerinterface.de
Serial: 1792575254
Refresh / retry: 14400 s / 3600 s
Expire: 604800 s
Negative TTL: 120 s

Serial per nameserver

Nameserver	Serial
ns1.mainns.de (192.174.68.21)	1792575254
ns1.mainns.de (2001:67c:1bc::21)	1792575254
ns2.mainns.eu (176.97.158.21)	1792575254
ns2.mainns.eu (2001:67c:10b8::21)	1792575254
ns3.mainns.net (192.174.68.20)	1792575254
ns3.mainns.net (2001:67c:1bc::20)	1792575254

Checks

✓ Serial 1792575254 everywhere #22

All nameservers serve the same version of the zone.
!

Unusual SOA timers

negative caching TTL (minimum) 2m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 4h, retry 1h, expire 7d, negative TTL 2m.

#23
✓ Primary is a public nameserver #24

The primary nameserver ns1.mainns.de is one of the listed nameservers.
✓ Contact info@domains.resellerinterface.de #25

The SOA RNAME info.domains.resellerinterface.de means info@domains.resellerinterface.de.
✓ Timestamp serial #26

The serial 1792575254 is a Unix timestamp (2026-10-21 09:34 UTC).

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: 29 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
64667	ECDSAP256SHA256 (13)	SHA256 0B8974989BE9D660…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
64184	ZSK (256)	ECDSAP256SHA256 (13)
64667	KSK (257)	ECDSAP256SHA256 (13)

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 64667 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13).
✓ Signatures valid until 2026-10-29 #30

The earliest DNSKEY/SOA signature expires at 2026-10-29 00:00 UTC.
✓ NSEC3 as recommended #31

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

Records

pass

16 records at the apex

Found

Read from: 192.174.68.21:53

Type	Value	TTL
SOA	ns1.mainns.de. info.domains.resellerinterface.de. 1792575254 14400 3600 604800 120	900
NS	ns1.mainns.de.	86400
NS	ns2.mainns.eu.	86400
NS	ns3.mainns.net.	86400
A	95.128.200.168	900
AAAA	2a00:1200:0:8::a47	900
MX	0 mail.do.de.	300
TXT	"Sendinblue-code:a57a60dd8bb8a9b3260826fab745bc27"	900
TXT	"google-site-verification=9LSHt4_lrrviWz1-iP2DjrMyPTK-ZK5et_6a05IQsho"	900
TXT	"v=spf1 ip4:95.128.200.169 ip6:2a00:1200:0:8::a48 include:spf.sendinblue.com include:spf.crsend.com -all"	900
CAA	0 issue "digicert.com"	900
CAA	0 issue "letsencrypt.org"	900
CAA	0 issue "sectigo.com"	900
CAA	0 issuewild "digicert.com"	900
CAA	0 issuewild "letsencrypt.org"	900
CAA	0 issuewild "sectigo.com"	900

Checks

✓ TTLs within range #32

TTLs: A 15m, AAAA 15m, MX 5m, 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: digicert.com, letsencrypt.org, sectigo.com.