zonerama.com

Checked 22 October 2026, 11:44 UTC · via 8.8.8.8
!Passed with warnings
27 passed 1 warning 0 failed 3 info

Registration

info

.com generic · CSL Computer Service Langenbach GmbH d/b/a joker.com · expires 2027-01-15

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
CSL Computer Service Langenbach GmbH d/b/a joker.com
Registered
15 January 2009
Last changed
5 January 2026
Expires
15 January 2027
Status
client transfer prohibited
Registry nameservers
ns1.regzone.cz, ns1.regzone.de, ns1.regzone.info
RDAP server
https://rdap.verisign.com/com/v1/

Checks

  • i
    .com is a generic TLD (gTLD)
    Generic TLD under an ICANN registry agreement: ICANN-accredited registrars, UDRP and RDAP apply.
    #1
  • ✓ TLD delegated and signed #2
    .com is delegated in the root zone and DNSSEC-signed.
  • ✓ Expires on 2027-01-15 #3
    The registration is valid until 2027-01-15 (85 days).
  • ✓ Transfer locked #4
    Registry status: client transfer prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

pass

ns1.regzone.cz, ns1.regzone.de, ns1.regzone.info

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.regzone.cz, ns1.regzone.de, ns1.regzone.info
NS in the zone
ns1.regzone.cz, ns1.regzone.de, ns1.regzone.info
NameserverAddressesNetwork (AS)Glue
ns1.regzone.cz217.198.113.10 2a00:19a0:3:71:0:d9c6:710a:1AS34222 ZONER-AS - ZONER a.s., CZ AS34222 ZONER-AS - ZONER a.s., CZ-
ns1.regzone.de23.92.29.43 2600:3c02::f03c:91ff:fedb:a6e7AS63949 AKAMAI-LINODE-AP - Akamai Connected Cloud, SG AS63949 AKAMAI-LINODE-AP - Akamai Connected Cloud, SG-
ns1.regzone.info81.0.233.10 2001:1528:147::10AS15685 CASABLANCA-AS - CASABLANCA INT a.s., CZ AS15685 CASABLANCA-AS - CASABLANCA INT a.s., CZ-

Checks

  • ✓ 3 nameservers #6
    Delegated to ns1.regzone.cz, ns1.regzone.de, ns1.regzone.info.
  • ✓ 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 3 IPv4 /24s and 3 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS15685 (CASABLANCA-AS - CASABLANCA INT a.s., CZ): 2 addresses; AS34222 (ZONER-AS - ZONER a.s., CZ): 2 addresses; AS63949 (AKAMAI-LINODE-AP - Akamai Connected Cloud, SG): 2 addresses.
  • ✓ Nameserver names under 3 TLDs #12
    Nameserver names use the TLDs .cz, .de, .info.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.regzone.cz 217.198.113.10NOERROR, 14 ms, authoritativenoyes / yesrefused-
ns1.regzone.cz 2a00:19a0:3:71:0:d9c6:710a:1NOERROR, 14 ms, authoritativenoyes / yesrefused-
ns1.regzone.de 23.92.29.43NOERROR, 109 ms, authoritativenoyes / yesrefused-
ns1.regzone.de 2600:3c02::f03c:91ff:fedb:a6e7NOERROR, 107 ms, authoritativenoyes / yesrefused-
ns1.regzone.info 81.0.233.10NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns1.regzone.info 2001:1528:147::10NOERROR, 8 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ 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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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 2026101102 · primary ns1.regzone.cz

Found

Primary (MNAME)
ns1.regzone.cz
Contact (RNAME)
administrator.czechia.cz
Serial
2026101102
Refresh / retry
10800 s / 1800 s
Expire
1814400 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns1.regzone.cz (217.198.113.10)2026101102
ns1.regzone.cz (2a00:19a0:3:71:0:d9c6:710a:1)2026101102
ns1.regzone.de (23.92.29.43)2026101102
ns1.regzone.de (2600:3c02::f03c:91ff:fedb:a6e7)2026101102
ns1.regzone.info (81.0.233.10)2026101102
ns1.regzone.info (2001:1528:147::10)2026101102

Checks

  • ✓ Serial 2026101102 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 30m, expire 21d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.regzone.cz is one of the listed nameservers.
  • ✓ Contact administrator@czechia.cz #25
    The SOA RNAME administrator.czechia.cz means administrator@czechia.cz.
  • ✓ Date-based serial #26
    The serial 2026101102 follows the YYYYMMDDnn convention (2026-10-11).

DNSSEC

warn

Not signed

Found

Validated by resolver
no

Checks

  • !
    Not signed
    The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.
    #27

Records

info

13 records at the apex

Found

Read from
217.198.113.10:53
TypeValueTTL
SOAns1.regzone.cz. administrator.czechia.cz. 2026101102 10800 1800 1814400 36003600
NSns1.regzone.cz.3600
NSns1.regzone.de.3600
NSns1.regzone.info.3600
A217.198.115.73600
AAAA2a00:19a0:3:73:0:d9c6:7307:13600
MX1 relay.zoner.com.3600
MX10 10mx.zoner.com.3600
MX15 15mx.zoner.com.3600
TXT"_kiduq7jvlh32opkahj9hornm624ihko"3600
TXT"_sd2hvju6mnatw3gmb3jehvkk9nrirme"3600
TXT"v=spf1 include:spf-zoner-corp.zoner.com ?all"3600
TXT"google-site-verification=FBnuBOQob8rqviz1kcGWKXGlOiCd94o1-hxfgivjO1I"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, AAAA 1h, MX 1h, NS 1h. The NS TTL at the parent is 2d and in the zone 1h; resolvers may use either.
  • ✓ 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
  • 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