ruv.de

Checked 22 October 2026, 00:01 UTC · via 8.8.8.8
!Passed with warnings
27 passed 1 warning 0 failed 5 info

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

dns-1.witcom.de, dns-2.witcom.de, pns.dtag.de, secondary004.dtag.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-1.witcom.de, dns-2.witcom.de, pns.dtag.de, secondary004.dtag.net
NS in the zone
dns-1.witcom.de, dns-2.witcom.de, pns.dtag.de, secondary004.dtag.net
NameserverAddressesNetwork (AS)Glue
dns-1.witcom.de217.19.176.2 2a00:1f08:800::2AS28676 Witcom-AS - WiTCOM Wiesbadener Informations- und Telekommunikations GmbH, DE AS28676 Witcom-AS - WiTCOM Wiesbadener Informations- und Telekommunikations GmbH, DE-
dns-2.witcom.de212.43.68.10 2a01:5c0:4::4AS42652 DELUNET - inexio Informationstechnologie und Telekommunikation Gmbh, DE AS42652 DELUNET - inexio Informationstechnologie und Telekommunikation Gmbh, DE-
pns.dtag.de194.25.0.125 2003:40:8000::100AS3320 DTAG - Deutsche Telekom AG, DE AS3320 DTAG - Deutsche Telekom AG, DE194.25.0.125 2003:40:8000::100
secondary004.dtag.net195.244.245.27 2a00:fa8:3:0:100:0:4:1AS5605 NETUSE - NetUSE AG, DE AS5605 NETUSE - NetUSE AG, DE-

Checks

  • ✓ 4 nameservers #6
    Delegated to dns-1.witcom.de, dns-2.witcom.de, 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 4 IPv4 /24s and 4 IPv6 /48s.
  • ✓ 4 autonomous systems #11
    The nameservers are spread over: AS28676 (Witcom-AS - WiTCOM Wiesbadener Informations- und Telekommunikations GmbH, DE): 2 addresses; AS3320 (DTAG - Deutsche Telekom AG, DE): 2 addresses; AS42652 (DELUNET - inexio Informationstechnologie und Telekommunikation Gmbh, 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

info

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-1.witcom.de 217.19.176.2NOERROR, 5 ms, authoritativenoyes / yesrefusedyou need to be more creative than that :-)
dns-1.witcom.de 2a00:1f08:800::2NOERROR, 5 ms, authoritativenoyes / yesrefusedyou need to be more creative than that :-)
dns-2.witcom.de 212.43.68.10NOERROR, 9 ms, authoritativenoyes / yesrefusedyou need to be more creative than that :-)
dns-2.witcom.de 2a01:5c0:4::4NOERROR, 11 ms, authoritativenoyes / yesrefusedyou need to be more creative than that :-)
pns.dtag.de 194.25.0.125NOERROR, 9 ms, authoritativenoyes / yesrefusedDomainNameServer
pns.dtag.de 2003:40:8000::100NOERROR, 7 ms, authoritativenoyes / yesrefusedDomainNameServer
secondary004.dtag.net 195.244.245.27NOERROR, 13 ms, authoritativenoyes / yesrefusedDomainNameServer
secondary004.dtag.net 2a00:fa8:3:0:100:0:4:1NOERROR, 17 ms, authoritativenoyes / yesrefusedDomainNameServer

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: dns-1.witcom.de: "you need to be more creative than that :-)"; dns-2.witcom.de: "you need to be more creative than that :-)"; pns.dtag.de: "DomainNameServer"; secondary004.dtag.net: "DomainNameServer".
    #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 2026102133 · primary pns.dtag.de

Found

Primary (MNAME)
pns.dtag.de
Contact (RNAME)
nms.ratiodata.de
Serial
2026102133
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
dns-1.witcom.de (217.19.176.2)2026102133
dns-1.witcom.de (2a00:1f08:800::2)2026102133
dns-2.witcom.de (212.43.68.10)2026102132
dns-2.witcom.de (2a01:5c0:4::4)2026102132
pns.dtag.de (194.25.0.125)2026102133
pns.dtag.de (2003:40:8000::100)2026102133
secondary004.dtag.net (195.244.245.27)2026102140
secondary004.dtag.net (2a00:fa8:3:0:100:0:4:1)2026102140

Checks

  • !
    Serials differ
    The nameservers serve different versions of the zone: 2026102132 on dns-2.witcom.de (212.43.68.10), dns-2.witcom.de (2a01:5c0:4::4); 2026102133 on dns-1.witcom.de (217.19.176.2), dns-1.witcom.de (2a00:1f08:800::2), pns.dtag.de (194.25.0.125), pns.dtag.de (2003:40:8000::100); 2026102140 on secondary004.dtag.net (195.244.245.27), secondary004.dtag.net (2a00:fa8:3:0:100:0:4:1). This is normal for a few minutes after a change; if it lasts, zone transfers to the secondaries are failing.
    #22
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 10m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver pns.dtag.de is one of the listed nameservers.
  • ✓ Contact nms@ratiodata.de #25
    The SOA RNAME nms.ratiodata.de means nms@ratiodata.de.
  • ✓ Date-based serial #26
    The serial 2026102133 follows the YYYYMMDDnn convention (2026-10-21).

DNSSEC

info

Signed, DS published at parent

Found

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

DS at the parent

Key tagAlgorithmDigestMatches a key
57544RSASHA256 (8)SHA256 1246F743311F5302…NO
499RSASHA256 (8)SHA256 1B442EC31DFCCAC5…yes

DNSKEY in the zone

Key tagRoleAlgorithm
3775ZSK (256)RSASHA256 (8)
499KSK (257)RSASHA256 (8)
21994ZSK (256)RSASHA256 (8)

Checks

  • ✓ Signed and validated #27
    The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
  • i
    Unused DS records
    These DS records match no key in the zone: key tag 57544 (SHA256). That is normal during a key rollover; otherwise remove them.
    #28
  • ✓ Modern algorithms #29
    Key algorithms: RSASHA256 (8).
  • ✓ Signatures valid until 2026-11-12 #30
    The earliest DNSKEY/SOA signature expires at 2026-11-12 07:14 UTC.
  • i
    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

pass

33 records at the apex

Found

Read from
217.19.176.2:53
TypeValueTTL
SOApns.dtag.de. nms.ratiodata.de. 2026102133 10800 3600 604800 600600
NSpns.dtag.de.600
NSdns-1.witcom.de.600
NSdns-2.witcom.de.600
NSsecondary004.dtag.net.600
A91.235.236.1423600
MX5 mail201.ruv.de.600
MX5 mail102.ruv.de.600
MX5 mail202.ruv.de.600
MX5 mail203.ruv.de.600
MX5 mail101.ruv.de.600
MX5 mail103.ruv.de.600
TXT"- atlassian-domain-verification=6xbte8lAUwjeS0Nz0/mhV0J1cQfk8i34nCamV3Pwz6TTdC5LdNUA2kVWCu9g9naS"600
TXT"google-gws-recovery-domain-verification=53857886"600
TXT"_h91ubquqma2tgk5j21wlyjwh35ruoky"600
TXT"docker-verification=970915cb-78f4-4a2c-9185-ac2ce1242093"600
TXT"rL1nTPuyzb+zJAyMCXwWbcM4/MVG+xanzaT6XpEpFlHC5I/EXuh6Sk0QF9d6RCgFWn0scnrqDUky/BHmTgTf5g=="600
TXT"google-site-verification=-Uy6oFDEnUd-hC92oyik_JEQggsTWCNuahmwMQyMxRc"600
TXT"facebook-domain-verification=3rvrpew1ua6ymlgymyjhozkqh9bko9"600
TXT"swisssign-check=okPr2jJdWpu52O9KNpQsRpXI99Q"600
TXT"QuoVadis=f47eb0ac-654b-47f5-8c25-4cd38f980686"600
TXT"swisssign-check=zHHcax6Foijrog0rbflRLhk7VB0"600
TXT"v=spf1 mx ip4:46.254.120.108 ip4:87.118.119.79 -all"600
TXT"ibmid=c1463de2-474b-4113-8416-81cf96609716"600
TXT"google-gws-recovery-domain-verification=72178830"600
TXT"MS=ms47901030"600
TXT"ftapi-domain-verification=8VaL9WrxYWjuhvkQoExwINm7MoYIle8J"600
TXT"adobe-idp-site-verification=bfbc3c37774f0169301b59e4897fd3ae458fdddbe0046ea2c636d531b4e1817e"600
TXT"pinterest-site-verification=56e05588bc4652af1aa0b6ed02497c21"600
CAA0 issue "letsencrypt.org"600
CAA0 issue "amazon.com"600
CAA0 issue "swisssign.com"600
CAA0 issue "digicert.com"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, MX 10m, NS 10m. The NS TTL at the parent is 1d and in the zone 10m; 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: letsencrypt.org, amazon.com, swisssign.com, digicert.com.