Domain report: oper-frankfurt.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.
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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

warn

ns1.3pc-dns.de, ns2.3pc-dns.de

Nameserver	Addresses	Network (AS)	Glue
ns1.3pc-dns.de	94.134.189.121	AS8881 VERSATEL - 1&1 Versatel GmbH, DE	94.134.189.121
ns2.3pc-dns.de	23.88.38.178	AS24940 HETZNER-AS - Hetzner Online GmbH, DE	23.88.38.178

i

2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.3pc-dns.de, ns2.3pc-dns.de.

#6
✓ 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 0 IPv6 /48s.
✓ 2 autonomous systems #11

The nameservers are spread over: AS24940 (HETZNER-AS - Hetzner Online GmbH, DE): 1 address; AS8881 (VERSATEL - 1&1 Versatel GmbH, DE): 1 address.
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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
!

No IPv6

None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.

#13

info

2 of 2 addresses answer authoritatively

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.3pc-dns.de 94.134.189.121	NOERROR, 17 ms, authoritative	no	yes / yes	refused	Served by PowerDNS - https://www.powerdns.com/
ns2.3pc-dns.de 23.88.38.178	NOERROR, 4 ms, authoritative	no	yes / yes	refused	Served by PowerDNS - https://www.powerdns.com/

✓ All respond #14

All 2 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.
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Identifying string disclosed

These nameservers answer version queries with a string that is not a version number: ns1.3pc-dns.de: "Served by PowerDNS - https://www.powerdns.com/"; ns2.3pc-dns.de: "Served by PowerDNS - https://www.powerdns.com/".

#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.

pass

serial 2026101600 · primary ns1.3pc-dns.de

Nameserver	Serial
ns1.3pc-dns.de (94.134.189.121)	2026101600
ns2.3pc-dns.de (23.88.38.178)	2026101600

✓ Serial 2026101600 everywhere #22

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

SOA refresh 1h, retry 15m, expire 14d, negative TTL 1h.
✓ Primary is a public nameserver #24

The primary nameserver ns1.3pc-dns.de is one of the listed nameservers.
✓ Contact hostmaster@3pc.de #25

The SOA RNAME hostmaster.3pc.de means hostmaster@3pc.de.
✓ Date-based serial #26

The serial 2026101600 follows the YYYYMMDDnn convention (2026-10-16).

warn

Not signed

info

8 records at the apex

✓ TTLs within range #32

TTLs: A 5m, MX 5m, NS 5m. The NS TTL at the parent is 1d and in the zone 5m; 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.
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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