yodobashi.com

Checked 22 October 2026, 11:40 UTC · via 8.8.8.8
!Passed with warnings
21 passed 5 warnings 0 failed 5 info

Registration

warn

.com generic · Japan Registry Services Co., Ltd. · expires 2026-11-16

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Japan Registry Services Co., Ltd.
Registered
16 November 1999
Last changed
14 November 2025
Expires
16 November 2026
Status
client delete prohibited, client transfer prohibited
Registry nameservers
ycodns51.yodobashi.com, yctdns51.yodobashi.com
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 in 24 days
    The registration expires on 2026-11-16. Make sure it is renewed.
    #3
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

warn

ycodns51.yodobashi.com, yctdns51.yodobashi.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ycodns51.yodobashi.com, yctdns51.yodobashi.com
NS in the zone
ycodns01.yodobashi.com, ycodns51.yodobashi.com, yctdns51.yodobashi.com
NameserverAddressesNetwork (AS)Glue
ycodns01.yodobashi.com (zone only)111.109.4.121AS2516 KDDI - KDDI CORPORATION, JP-
ycodns51.yodobashi.com111.109.4.121AS2516 KDDI - KDDI CORPORATION, JP111.109.4.121
yctdns51.yodobashi.com219.127.199.121AS17676 GIGAINFRA - SoftBank Corp., JP219.127.199.121

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ycodns51.yodobashi.com, yctdns51.yodobashi.com.
    #6
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only in the zone: ycodns01.yodobashi.com. ycodns01.yodobashi.com, ycodns51.yodobashi.com, yctdns51.yodobashi.com report NS ycodns01.yodobashi.com ycodns51.yodobashi.com yctdns51.yodobashi.com.
    #7
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: ycodns51.yodobashi.com, yctdns51.yodobashi.com.
  • ✓ 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 0 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS17676 (GIGAINFRA - SoftBank Corp., JP): 1 address; AS2516 (KDDI - KDDI CORPORATION, JP): 2 addresses.
  • i
    All nameserver names under .com
    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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

pass

3 of 3 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ycodns01.yodobashi.com 111.109.4.121NOERROR, 261 ms, authoritativenoyes / yesrefused-
ycodns51.yodobashi.com 111.109.4.121NOERROR, 268 ms, authoritativenoyes / yesrefused-
yctdns51.yodobashi.com 219.127.199.121NOERROR, 235 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 3 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 2026101701 · primary yctdns01.yodobashi.com

Found

Primary (MNAME)
yctdns01.yodobashi.com
Contact (RNAME)
hirota.yodobashi.co.jp
Serial
2026101701
Refresh / retry
10800 s / 1800 s
Expire
3600000 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ycodns01.yodobashi.com (111.109.4.121)2026101701
ycodns51.yodobashi.com (111.109.4.121)2026101701
yctdns51.yodobashi.com (219.127.199.121)2026101701

Checks

  • ✓ Serial 2026101701 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 30m, expire 1000h, negative TTL 5m.
  • i
    Hidden master
    The primary nameserver yctdns01.yodobashi.com 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 hirota@yodobashi.co.jp #25
    The SOA RNAME hirota.yodobashi.co.jp means hirota@yodobashi.co.jp.
  • ✓ Date-based serial #26
    The serial 2026101701 follows the YYYYMMDDnn convention (2026-10-17).

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

warn

13 records at the apex

Found

Read from
111.109.4.121:53
TypeValueTTL
SOAyctdns01.yodobashi.com. hirota.yodobashi.co.jp. 2026101701 10800 1800 3600000 30086400
NSyctdns51.yodobashi.com.86400
NSycodns01.yodobashi.com.86400
NSycodns51.yodobashi.com.86400
A101.102.202.1160
MX20 ycteml11.yodobashi.com.600
MX30 ycoeml12.yodobashi.com.600
MX40 ycoeml11.yodobashi.com.600
MX10 ycteml12.yodobashi.com.600
TXT"facebook-domain-verification=k7zsbckettc6d1b2jykn82d18edx4i"300
TXT"_4dyi4a1p8drjngyj8oax15qrxfczud8"300
TXT"v=spf1 +ip4:219.127.199.0/25 +ip4:111.109.4.0/25 +ip4:221.186.84.24/29 -all"300
TXT"_sf1yojegkmaw4yya25tejq2ixb5iqq7"300

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 1d; resolvers may use either.
    #32
  • ✓ 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