one.com

Checked 22 October 2026, 10:05 UTC · via 8.8.8.8
iAll checks passed
31 passed 0 warnings 0 failed 4 info

Registration

info

.com generic · CSL Computer Service Langenbach GmbH d/b/a joker.com · expires 2036-02-13

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
CSL Computer Service Langenbach GmbH d/b/a joker.com
Registered
12 February 1992
Last changed
22 June 2026
Expires
13 February 2036
Status
client transfer prohibited
Registry nameservers
auth.g1-dns.com, auth.g1-dns.one
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 2036-02-13 #3
    The registration is valid until 2036-02-13 (3400 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

info

auth.g1-dns.com, auth.g1-dns.one

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
auth.g1-dns.com, auth.g1-dns.one
NS in the zone
auth.g1-dns.com, auth.g1-dns.one
NameserverAddressesNetwork (AS)Glue
auth.g1-dns.com195.206.121.11 2001:67c:28cc::11AS197495 ONECOM-INFRA - One.com A/S, DK AS197495 ONECOM-INFRA - One.com A/S, DK195.206.121.11 2001:67c:28cc::11
auth.g1-dns.one185.10.11.11 2001:67c:3c0::11AS51468 ONECOM - One.com A/S, DK AS51468 ONECOM - One.com A/S, DK-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: auth.g1-dns.com, auth.g1-dns.one.
    #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 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS197495 (ONECOM-INFRA - One.com A/S, DK): 2 addresses; AS51468 (ONECOM - One.com A/S, DK): 2 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .com, .one.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
auth.g1-dns.com 195.206.121.11NOERROR, 19 ms, authoritativenoyes / yesrefused-
auth.g1-dns.com 2001:67c:28cc::11NOERROR, 18 ms, authoritativenoyes / yesrefused-
auth.g1-dns.one 185.10.11.11NOERROR, 16 ms, authoritativenoyes / yesrefused-
auth.g1-dns.one 2001:67c:3c0::11NOERROR, 16 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 4 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

info

serial 2026102201 · primary a.b-one-dns.net

Found

Primary (MNAME)
a.b-one-dns.net
Contact (RNAME)
hostmaster.one.com
Serial
2026102201
Refresh / retry
1800 s / 900 s
Expire
1209600 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
auth.g1-dns.com (195.206.121.11)2026102201
auth.g1-dns.com (2001:67c:28cc::11)2026102201
auth.g1-dns.one (185.10.11.11)2026102201
auth.g1-dns.one (2001:67c:3c0::11)2026102201

Checks

  • ✓ Serial 2026102201 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 30m, retry 15m, expire 14d, negative TTL 5m.
  • i
    Hidden master
    The primary nameserver a.b-one-dns.net is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact hostmaster@one.com #25
    The SOA RNAME hostmaster.one.com means hostmaster@one.com.
  • ✓ Date-based serial #26
    The serial 2026102201 follows the YYYYMMDDnn convention (2026-10-22).

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
5 November 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
44996ECDSAP256SHA256 (13)SHA256 BA4392D771A11798…yes

DNSKEY in the zone

Key tagRoleAlgorithm
17015ZSK (256)ECDSAP256SHA256 (13)
44996KSK (257)ECDSAP256SHA256 (13)

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 44996 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-11-05 #30
    The earliest DNSKEY/SOA signature expires at 2026-11-05 00:00 UTC.
  • ✓ NSEC3 as recommended #31
    The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

info

21 records at the apex

Found

Read from
195.206.121.11:53
TypeValueTTL
SOAa.b-one-dns.net. hostmaster.one.com. 2026102201 1800 900 1209600 30086400
NSauth.g1-dns.com.259200
NSauth.g1-dns.one.259200
A195.47.247.8600
A195.47.247.9600
AAAA2a02:2350:6::6514:e26d600
MX10 mx3.pub.mailpod12-cph3.one.com.86400
MX10 mx4.pub.mailpod12-cph3.one.com.86400
MX10 mx2.pub.mailpod12-cph3.one.com.86400
MX10 mx1.pub.mailpod12-cph3.one.com.86400
TXT"atlassian-domain-verification=KKeihQSanTHe0l1pqlAF48oghg9rSqxhRZakMd/Gq8e8xTF/maaW2agw60HZU5va"86400
TXT"google-site-verification=SJnzgdADXmE_K3rQEbVVmYXgxa_0Auh5oDN4KBGp_n8"86400
TXT"apple-domain-verification=NW7F5wIbiIMoDyGn"86400
TXT"0c2ce30eb74af62b8f39fe80d2821090"86400
TXT"slack-domain-verification=cKfMkGzW2T6D9IwrAfw3WqEMiCNY7Xsnd5cMo7VQ"86400
TXT"MS=ms80165880"86400
TXT"facebook-domain-verification=bzipsayq3fcwysb04sfrb7n28umr70"86400
TXT"status-page-domain-verification=jxn9sv5yjjk0"86400
TXT"google-site-verification=PxhP_oeeJYM6XtUKPbyWuAA4BSR1OgKY5Il_zMhZZ4g"86400
TXT"google-site-verification=4Lzw-cbsiavKFAeFkvS2gV5_0WSmzGm_yFpWuUy0gTw"86400
TXT"v=spf1 include:_spf.one.com include:spf.mail.intercom.io include:mail.zendesk.com include:spf.mandrillapp.com include:servers.mcsv.net include:spf.protection.outlook.de include:secure-mailgate.com ~all"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, AAAA 10m, MX 1d, NS 3d. The NS TTL at the parent is 2d and in the zone 3d; 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.
  • 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