Domain report: elster.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

pass

a1-214.akam.net, a11-66.akam.net, a3-66.akam.net, a8-66.akam.net, pns.dtag.de, secondary004.dtag.net

Found

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: a1-214.akam.net, a11-66.akam.net, a3-66.akam.net, a8-66.akam.net, pns.dtag.de, secondary004.dtag.net
NS in the zone: a1-214.akam.net, a11-66.akam.net, a3-66.akam.net, a8-66.akam.net, pns.dtag.de, secondary004.dtag.net

Nameserver	Addresses	Network (AS)	Glue
a1-214.akam.net	193.108.91.214 2600:1401:2::d6	AS20940 AKAMAI-ASN1 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL	-
a11-66.akam.net	84.53.139.66 2600:1480:1::42	AS20940 AKAMAI-ASN1 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL	-
a3-66.akam.net	96.7.49.66 2600:1408:1c::42	AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL	-
a8-66.akam.net	2.16.40.66 2600:1403:a::42	AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL	-
pns.dtag.de	194.25.0.125 2003:40:8000::100	AS3320 DTAG - Deutsche Telekom AG, DE AS3320 DTAG - Deutsche Telekom AG, DE	194.25.0.125 2003:40:8000::100
secondary004.dtag.net	195.244.245.27 2a00:fa8:3:0:100:0:4:1	AS5605 NETUSE - NetUSE AG, DE AS5605 NETUSE - NetUSE AG, DE	-

Checks

✓ 6 nameservers #6

Delegated to a1-214.akam.net, a11-66.akam.net, a3-66.akam.net, a8-66.akam.net, pns.dtag.de, secondary004.dtag.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 6 IPv4 /24s and 6 IPv6 /48s.
✓ 4 autonomous systems #11

The nameservers are spread over: AS20940 (AKAMAI-ASN1 - Akamai International B.V., NL): 2 addresses; AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 6 addresses; AS3320 (DTAG - Deutsche Telekom AG, DE): 2 addresses; AS5605 (NETUSE - NetUSE AG, DE): 2 addresses.
✓ Nameserver names under 2 TLDs #12

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

Every nameserver has an IPv6 address.

Nameservers

warn

12 of 12 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
a1-214.akam.net 193.108.91.214	NOERROR, 7 ms, authoritative	no	yes / yes	refused	41824.7
a1-214.akam.net 2600:1401:2::d6	NOERROR, 6 ms, authoritative	no	yes / yes	refused	41824.5
a11-66.akam.net 84.53.139.66	NOERROR, 4 ms, authoritative	no	yes / yes	refused	41824.7
a11-66.akam.net 2600:1480:1::42	NOERROR, 4 ms, authoritative	no	yes / yes	refused	41824.4
a3-66.akam.net 96.7.49.66	NOERROR, 3 ms, authoritative	no	yes / yes	refused	41824.5
a3-66.akam.net 2600:1408:1c::42	NOERROR, 4 ms, authoritative	no	yes / yes	refused	41824.5
a8-66.akam.net 2.16.40.66	NOERROR, 5 ms, authoritative	no	yes / yes	refused	48878.32
a8-66.akam.net 2600:1403:a::42	NOERROR, 5 ms, authoritative	no	yes / yes	refused	48878.26
pns.dtag.de 194.25.0.125	NOERROR, 10 ms, authoritative	no	yes / yes	refused	DomainNameServer
pns.dtag.de 2003:40:8000::100	NOERROR, 8 ms, authoritative	no	yes / yes	refused	DomainNameServer
secondary004.dtag.net 195.244.245.27	NOERROR, 16 ms, authoritative	no	yes / yes	refused	DomainNameServer
secondary004.dtag.net 2a00:fa8:3:0:100:0:4:1	NOERROR, 19 ms, authoritative	no	yes / yes	refused	DomainNameServer

Checks

✓ All respond #14

All 12 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: a1-214.akam.net: "41824.7"; a1-214.akam.net: "41824.5"; a11-66.akam.net: "41824.7"; a11-66.akam.net: "41824.4"; a3-66.akam.net: "41824.5"; a8-66.akam.net: "48878.32"; a8-66.akam.net: "48878.26". 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

warn

serial 2026102108 · primary pns.dtag.de

Found

Primary (MNAME): pns.dtag.de
Contact (RNAME): hostmaster.elster.de
Serial: 2026102108
Refresh / retry: 300 s / 1800 s
Expire: 1209600 s
Negative TTL: 300 s

Serial per nameserver

Nameserver	Serial
a1-214.akam.net (193.108.91.214)	2026102108
a1-214.akam.net (2600:1401:2::d6)	2026102108
a11-66.akam.net (84.53.139.66)	2026102108
a11-66.akam.net (2600:1480:1::42)	2026102108
a3-66.akam.net (96.7.49.66)	2026102108
a3-66.akam.net (2600:1408:1c::42)	2026102108
a8-66.akam.net (2.16.40.66)	2026102108
a8-66.akam.net (2600:1403:a::42)	2026102108
pns.dtag.de (194.25.0.125)	2026102108
pns.dtag.de (2003:40:8000::100)	2026102108
secondary004.dtag.net (195.244.245.27)	2026102108
secondary004.dtag.net (2a00:fa8:3:0:100:0:4:1)	2026102108

Checks

✓ Serial 2026102108 everywhere #22

All nameservers serve the same version of the zone.
!

Unusual SOA timers

refresh 5m is outside 20m–1d; retry 30m should be shorter than refresh 5m. Current values: refresh 5m, retry 30m, expire 14d, negative TTL 5m.

#23
✓ Primary is a public nameserver #24

The primary nameserver pns.dtag.de is one of the listed nameservers.
✓ Contact hostmaster@elster.de #25

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

The serial 2026102108 follows the YYYYMMDDnn convention (2026-10-21).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 0 iterations, 8-byte salt
Signatures valid until: 3 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
48361	RSASHA256 (8)	SHA256 46E47AC61D7A7CB6…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
2799	ZSK (256)	RSASHA256 (8)
48361	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 48361 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Signatures valid until 2026-11-03 #30

The earliest DNSKEY/SOA signature expires at 2026-11-03 06:27 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 0 iterations and a 8-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.

#31

Records

pass

20 records at the apex

Found

Read from: 193.108.91.214:53

Type	Value	TTL
SOA	pns.dtag.de. hostmaster.elster.de. 2026102108 300 1800 1209600 300	300
NS	a1-214.akam.net.	300
NS	a8-66.akam.net.	300
NS	secondary004.dtag.net.	300
NS	a11-66.akam.net.	300
NS	pns.dtag.de.	300
NS	a3-66.akam.net.	300
A	185.176.166.75	300
AAAA	2a02:1140:109:2003:d1eb:15c4:0:cd	300
MX	30 edmmx02.elster.de.	300
MX	30 edmmx03.elster.de.	300
MX	99 fake-mx.elster.de.	300
TXT	"v=spf1 mx include:_spf.blk1.elster.de include:_spf.blk2.elster.de include:_spf.blk3.elster.de include:_spf.blk4.elster.de include:_spf.blk5.elster.de include:_spf.blk6.elster.de include:_spf.blso.elster.de ~all"	300
TXT	"MS=7B184F7133FA6F4419018914042F2C9A28CF6472"	300
CAA	0 issuewild "d-trust.net"	300
CAA	0 issue "d-trust.net"	300
CAA	0 iodef "mailto:hostmaster@elster.de"	300
CAA	0 issue "digicert.com"	300
CAA	0 issuewild "digicert.com"	300
CAA	0 contactemail "hostmaster@elster.de"	300

Checks

✓ TTLs within range #32

TTLs: A 5m, AAAA 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.
✓ CAA restricts issuance #35

Certificates may be issued by: d-trust.net, digicert.com.