Domain report: mail.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

anycast1.irondns.net, anycast2.irondns.net, sec1.rcode0.net, sec2.rcode0.net

Found

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: anycast1.irondns.net, anycast2.irondns.net, sec1.rcode0.net, sec2.rcode0.net
NS in the zone: anycast1.irondns.net, anycast2.irondns.net, sec1.rcode0.net, sec2.rcode0.net

Nameserver	Addresses	Network (AS)	Glue
anycast1.irondns.net	195.253.64.5 2a01:5b0:4::5	AS8561 KNIPPWORLDWIDE - Knipp Medien und Kommunikation GmbH, DE AS8561 KNIPPWORLDWIDE - Knipp Medien und Kommunikation GmbH, DE	-
anycast2.irondns.net	195.253.65.5 2a01:5b0:5::5	AS8391 KNIPP-AS - Knipp Medien und Kommunikation GmbH, DE AS50611 KNIPP-IRONDNS1-AS - Knipp Medien und Kommunikation GmbH, DE	-
sec1.rcode0.net	192.174.68.100 2001:67c:1bc::100	AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT	-
sec2.rcode0.net	176.97.158.100 2001:67c:10b8::100	AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT	-

Checks

✓ 4 nameservers #6

Delegated to anycast1.irondns.net, anycast2.irondns.net, sec1.rcode0.net, sec2.rcode0.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 4 IPv4 /24s and 4 IPv6 /48s.
✓ 4 autonomous systems #11

The nameservers are spread over: AS1921 (RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT): 4 addresses; AS50611 (KNIPP-IRONDNS1-AS - Knipp Medien und Kommunikation GmbH, DE): 1 address; AS8391 (KNIPP-AS - Knipp Medien und Kommunikation GmbH, DE): 1 address; AS8561 (KNIPPWORLDWIDE - Knipp Medien und Kommunikation GmbH, DE): 2 addresses.
i

All nameserver names under .net

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.

Nameservers

info

8 of 8 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
anycast1.irondns.net 195.253.64.5	NOERROR, 20 ms, authoritative	no	yes / yes	refused	-
anycast1.irondns.net 2a01:5b0:4::5	NOERROR, 23 ms, authoritative	no	yes / yes	refused	-
anycast2.irondns.net 195.253.65.5	NOERROR, 20 ms, authoritative	no	yes / yes	refused	-
anycast2.irondns.net 2a01:5b0:5::5	NOERROR, 23 ms, authoritative	no	yes / yes	refused	-
sec1.rcode0.net 192.174.68.100	NOERROR, 5 ms, authoritative	no	yes / yes	refused	RcodeZero DNS
sec1.rcode0.net 2001:67c:1bc::100	NOERROR, 8 ms, authoritative	no	yes / yes	refused	RcodeZero DNS
sec2.rcode0.net 176.97.158.100	NOERROR, 11 ms, authoritative	no	yes / yes	refused	reg-wie1
sec2.rcode0.net 2001:67c:10b8::100	NOERROR, 13 ms, authoritative	no	yes / yes	refused	reg-wie1

Checks

✓ All respond #14

All 8 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: sec1.rcode0.net: "RcodeZero DNS"; sec2.rcode0.net: "reg-wie1".

#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 6864 · primary anycast1.irondns.net

Found

Primary (MNAME): anycast1.irondns.net
Contact (RNAME): dnsmaster.irondns.net
Serial: 6864
Refresh / retry: 10800 s / 3000 s
Expire: 2419200 s
Negative TTL: 900 s

Serial per nameserver

Nameserver	Serial
anycast1.irondns.net (195.253.64.5)	6864
anycast1.irondns.net (2a01:5b0:4::5)	6864
anycast2.irondns.net (195.253.65.5)	6864
anycast2.irondns.net (2a01:5b0:5::5)	6864
sec1.rcode0.net (192.174.68.100)	6864
sec1.rcode0.net (2001:67c:1bc::100)	6864
sec2.rcode0.net (176.97.158.100)	6864
sec2.rcode0.net (2001:67c:10b8::100)	6864

Checks

✓ Serial 6864 everywhere #22

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

SOA refresh 3h, retry 50m, expire 28d, negative TTL 15m.
✓ Primary is a public nameserver #24

The primary nameserver anycast1.irondns.net is one of the listed nameservers.
✓ Contact dnsmaster@irondns.net #25

The SOA RNAME dnsmaster.irondns.net means dnsmaster@irondns.net.
✓ Counter serial #26

The serial 6864 is a plain counter.

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
30519	RSASHA512 (10)	SHA256 FEAECFF1262546B9…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
55671	KSK (257)	RSASHA512 (10)
30519	KSK (257)	RSASHA512 (10)
5025	ZSK (256)	RSASHA512 (10)

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 30519 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA512 (10).
✓ Signatures valid until 2026-10-29 #30

The earliest DNSKEY/SOA signature expires at 2026-10-29 10:50 UTC.
✓ NSEC3 as recommended #31

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

Records

info

18 records at the apex

Found

Read from: 195.253.64.5:53

Type	Value	TTL
SOA	anycast1.irondns.net. dnsmaster.irondns.net. 6864 10800 3000 2419200 900	86400
NS	anycast2.irondns.net.	86400
NS	sec1.rcode0.net.	86400
NS	anycast1.irondns.net.	86400
NS	sec2.rcode0.net.	86400
A	62.201.172.8	600
AAAA	2001:868:100:600::200	3600
MX	10 mx01.mail.de.	3600
MX	10 mx02.mail.de.	3600
TXT	"google-site-verification=sl9KWG5m93CAT_QCIN1hq9Ryle8rp_9wNCd0_JvX2mA"	3600
TXT	"v=spf1 ip4:62.201.172.0/27 ip4:62.201.172.32/27 ip6:2001:0868:0100:0600::/64 ip4:194.113.42.0/26 ip6:2a0f:f640::/56 ~all"	3600
CAA	0 iodef "mailto:hostmaster@mail.de"	3600
CAA	0 issue "digicert.com"	3600
CAA	0 issue "comodoca.com"	3600
CAA	0 issue "letsencrypt.org"	3600
CAA	0 issuewild "digicert.com"	3600
CAA	0 issuewild "comodoca.com"	3600
CAA	0 issuewild "letsencrypt.org"	3600

Checks

✓ TTLs within range #32

TTLs: A 10m, AAAA 1h, MX 1h, NS 1d.
✓ No CNAME at the apex #33

The zone apex has no CNAME record.
i

Wildcard record

A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.

#34
✓ CAA restricts issuance #35

Certificates may be issued by: digicert.com, comodoca.com, letsencrypt.org.