Domain report: weizenbaum-institut.de

Registration

info

.de country-code

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

warn

dns-1.dfn.de, dns-2.dfn.de, dns-3.dfn.de

Nameserver	Addresses	Network (AS)	Glue
dns-1.dfn.de	193.174.75.50 2001:638:d:b101::1	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	-
dns-2.dfn.de	193.174.75.54 2001:638:d:b102::1	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	-
dns-3.dfn.de	193.174.75.58 2001:638:d:b103::1	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	-

✓ 3 nameservers #6

Delegated to dns-1.dfn.de, dns-2.dfn.de, dns-3.dfn.de.
✓ 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 one network

all IPv4 addresses are in 193.174.75.0/24; all IPv6 addresses are in 2001:638:d::/48. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).

#10
i

All nameservers in one AS

All nameserver addresses are announced by one network operator (AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., 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
i

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
✓ All reachable over IPv6 #13

Every nameserver has an IPv6 address.

info

6 of 6 addresses answer authoritatively

Nameserver	Answer	Recursion	TCP / EDNS	AXFR
dns-1.dfn.de 193.174.75.50	NOERROR, 14 ms, authoritative	no	yes / yes	refused
dns-1.dfn.de 2001:638:d:b101::1	NOERROR, 15 ms, authoritative	no	yes / yes	refused
dns-2.dfn.de 193.174.75.54	NOERROR, 7 ms, authoritative	no	yes / yes	refused
dns-2.dfn.de 2001:638:d:b102::1	NOERROR, 10 ms, authoritative	no	yes / yes	refused
dns-3.dfn.de 193.174.75.58	NOERROR, 8 ms, authoritative	no	yes / yes	refused
dns-3.dfn.de 2001:638:d:b103::1	NOERROR, 14 ms, authoritative	no	yes / yes	refused

✓ 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: dns-1.dfn.de: "0"; dns-2.dfn.de: "0"; dns-3.dfn.de: "0".

#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.

warn

serial 2021072745 · primary dns-1.dfn.de

✓ Serial 2021072745 everywhere #22

All nameservers serve the same version of the zone.
!

Unusual SOA timers

retry 1h should be shorter than refresh 1h. Current values: refresh 1h, retry 1h, expire 21d, negative TTL 1h.

#23
✓ Primary is a public nameserver #24

The primary nameserver dns-1.dfn.de is one of the listed nameservers.
✓ Contact hostmaster@weizenbaum-institut.de #25

The SOA RNAME hostmaster.weizenbaum-institut.de means hostmaster@weizenbaum-institut.de.
✓ Date-based serial #26

The serial 2021072745 follows the YYYYMMDDnn convention (2021-07-27).

warn

Not signed

info

11 records at the apex

Type	Value	TTL
SOA	dns-1.dfn.de. hostmaster.weizenbaum-institut.de. 2021072745 3600 3600 1814400 3600	3600
NS	dns-3.dfn.de.	3600
NS	dns-2.dfn.de.	3600
NS	dns-1.dfn.de.	3600
A	88.198.132.234	3600
AAAA	2a01:4f8:221:1f0b:1::1	3600
MX	10 weizenbauminstitut-de02e.mail.protection.outlook.com.	3600
TXT	"google-site-verification=cvIwCzBf_h1xFML6re1_DMFm-SNjDFKi9JGvRZH1eLw"	3600
TXT	"v=spf1 mx a:wall.weizenbaum-institut.de a:mout.weizenbaum-institut.de a:newslettertogo.com a:em108.email.kenjo.io include:spf.protection.outlook.com -all"	3600
TXT	"ms=ms56498128"	3600
TXT	"brevo-code:a1018576b6f405657fb05e1632ecf1c7"	3600

✓ TTLs within range #32

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