Domain report: mpg.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

dns1.gwdg.de, dns2.gwdg.de, dns3.gwdg.de, ns1.es.net, sat.mpcdf.mpg.de

Found

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: dns1.gwdg.de, dns2.gwdg.de, dns3.gwdg.de, ns1.es.net, sat.mpcdf.mpg.de
NS in the zone: dns1.gwdg.de, dns2.gwdg.de, dns3.gwdg.de, ns1.es.net, sat.mpcdf.mpg.de

Nameserver	Addresses	Network (AS)	Glue
dns1.gwdg.de	134.76.33.41 2a06:93c7:e1::1	AS207592 GOENET - Gesellschaft fuer wissenschaftliche Datenverarbeitung mbH, Goettingen, DE AS207592 GOENET - Gesellschaft fuer wissenschaftliche Datenverarbeitung mbH, Goettingen, DE	134.76.33.41 2a06:93c7:e1::1
dns2.gwdg.de	134.76.33.42 2a06:93c7:e2::1	AS207592 GOENET - Gesellschaft fuer wissenschaftliche Datenverarbeitung mbH, Goettingen, DE AS207592 GOENET - Gesellschaft fuer wissenschaftliche Datenverarbeitung mbH, Goettingen, DE	134.76.33.42 2a06:93c7:e2::1
dns3.gwdg.de	193.175.210.140	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	193.175.210.140
ns1.es.net	198.128.2.10 2001:400:14:2::10	AS292 ESNET-WEST - ESnet, US AS293 ESNET - ESnet, US	-
sat.mpcdf.mpg.de	130.183.1.21 2a02:d480:80:1::21	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	130.183.1.21 2a02:d480:80:1::21

Checks

✓ 5 nameservers #6

Delegated to dns1.gwdg.de, dns2.gwdg.de, dns3.gwdg.de, ns1.es.net, sat.mpcdf.mpg.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: sat.mpcdf.mpg.de.
✓ 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 4 IPv4 /24s and 4 IPv6 /48s.
✓ 4 autonomous systems #11

The nameservers are spread over: AS207592 (GOENET - Gesellschaft fuer wissenschaftliche Datenverarbeitung mbH, Goettingen, DE): 4 addresses; AS292 (ESNET-WEST - ESnet, US): 1 address; AS293 (ESNET - ESnet, US): 1 address; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 3 addresses.
✓ Nameserver names under 2 TLDs #12

Nameserver names use the TLDs .de, .net.
i

Partly IPv6

These nameservers have no IPv6 address: dns3.gwdg.de.

#13

Nameservers

warn

9 of 9 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
dns1.gwdg.de 134.76.33.41	NOERROR, 8 ms, authoritative	no	yes / yes	refused	-
dns1.gwdg.de 2a06:93c7:e1::1	NOERROR, 8 ms, authoritative	no	yes / yes	refused	-
dns2.gwdg.de 134.76.33.42	NOERROR, 8 ms, authoritative	no	yes / yes	refused	-
dns2.gwdg.de 2a06:93c7:e2::1	NOERROR, 8 ms, authoritative	no	yes / yes	refused	-
dns3.gwdg.de 193.175.210.140	NOERROR, 13 ms, authoritative	no	yes / yes	refused	-
ns1.es.net 198.128.2.10	NOERROR, 154 ms, authoritative	no	yes / yes	refused	<insert obviously fake version here>
ns1.es.net 2001:400:14:2::10	NOERROR, 150 ms, authoritative	no	yes / yes	refused	<insert obviously fake version here>
sat.mpcdf.mpg.de 130.183.1.21	NOERROR, 13 ms, authoritative	no	yes / yes	refused	9.20.23
sat.mpcdf.mpg.de 2a02:d480:80:1::21	NOERROR, 12 ms, authoritative	no	yes / yes	refused	9.20.23

Checks

✓ All respond #14

All 9 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: sat.mpcdf.mpg.de: "9.20.23". 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 811137791 · primary dns1.gwdg.de

Found

Primary (MNAME): dns1.gwdg.de
Contact (RNAME): hostmaster.gwdg.de
Serial: 811137791
Refresh / retry: 21600 s / 3600 s
Expire: 2419200 s
Negative TTL: 3600 s

Serial per nameserver

Nameserver	Serial
dns1.gwdg.de (134.76.33.41)	811137791
dns1.gwdg.de (2a06:93c7:e1::1)	811137791
dns2.gwdg.de (134.76.33.42)	811137791
dns2.gwdg.de (2a06:93c7:e2::1)	811137791
dns3.gwdg.de (193.175.210.140)	811137791
ns1.es.net (198.128.2.10)	811137791
ns1.es.net (2001:400:14:2::10)	811137791
sat.mpcdf.mpg.de (130.183.1.21)	811137791
sat.mpcdf.mpg.de (2a02:d480:80:1::21)	811137791

Checks

✓ Serial 811137791 everywhere #22

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

SOA refresh 6h, retry 1h, expire 28d, negative TTL 1h.
✓ Primary is a public nameserver #24

The primary nameserver dns1.gwdg.de is one of the listed nameservers.
✓ Contact hostmaster@gwdg.de #25

The SOA RNAME hostmaster.gwdg.de means hostmaster@gwdg.de.
✓ Counter serial #26

The serial 811137791 is a plain counter.

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC
Signatures valid until: 18 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
4040	ECDSAP256SHA256 (13)	SHA256 5BAB7EC9421F6208…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
4040	KSK (257)	ECDSAP256SHA256 (13)
10279	ZSK (256)	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 4040 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13).
✓ Signatures valid until 2026-11-18 #30

The earliest DNSKEY/SOA signature expires at 2026-11-18 04:31 UTC.
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NSEC

The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.

#31

Records

info

20 records at the apex

Found

Read from: 134.76.33.41:53

Type	Value	TTL
SOA	dns1.gwdg.de. hostmaster.gwdg.de. 811137791 21600 3600 2419200 3600	60
NS	ns1.es.net.	86400
NS	dns1.gwdg.de.	86400
NS	dns2.gwdg.de.	86400
NS	dns3.gwdg.de.	86400
NS	sat.mpcdf.mpg.de.	86400
A	134.76.31.198	3600
MX	50 c1236.mx.srv.dfn.de.	3600
MX	50 a1236.mx.srv.dfn.de.	3600
MX	50 b1236.mx.srv.dfn.de.	3600
TXT	"google-site-verification=dnSBuenbktdrWBa2AyYCTsb6kohTtitwQvtLHzFcXWM"	3600
TXT	"v=spf1 mx include:spf.gwdg.de include:spf.yve-tool.de ip4:155.56.221.13 ip4:155.56.221.14 ~all"	3600
TXT	"zone-ownership-verification-4e95ba1562fe6b7d7fd5000d249ed3fefed9803b10aab281fb17bc3f9612c984"	3600
TXT	"MS=ms65105063"	3600
TXT	"hibp-verify=dweb_0tywy72sz0avnp2yfrm5v1g9"	3600
TXT	"adobe-idp-site-verification=4efc5f4912ea5b60334e2704bb3eb956c5e7849e481abd33757f0b1d79d432f3"	3600
TXT	"HARICA-pw7aETtKChy5LZdh5ka"	3600
TXT	"google-site-verification=XHSgSiW3S-oNc6utmVvWr_K-iNo1ZpYHGDMV1ev8txw"	3600
TXT	"google-site-verification=_8HT2hqpeJwL__q-eYwM6eKubRP2nX8kFao2_IlfZOc"	3600
TXT	"HARICA-B3a5xcxUKYCCSLCxYVE"	3600

Checks

✓ TTLs within range #32

TTLs: A 1h, MX 1h, 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.
i

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