nikon.com

Checked 22 October 2026, 10:03 UTC · via 8.8.8.8
✗Problems found
21 passed 2 warnings 1 failed 7 info

Registration

info

.com generic · Japan Registry Services Co., Ltd. · expires 2026-12-22

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Japan Registry Services Co., Ltd.
Registered
23 December 1993
Last changed
20 December 2025
Expires
22 December 2026
Status
active
Registry nameservers
dns-a.iij.ad.jp, dns21jp.nikon.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 on 2026-12-22 #3
    The registration is valid until 2026-12-22 (60 days).
  • i
    No transfer lock
    The domain has no transfer lock (status: active). A registrar lock protects against unauthorized transfers.
    #4
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

dns-a.iij.ad.jp, dns21jp.nikon.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
dns-a.iij.ad.jp, dns21jp.nikon.com
NS in the zone
dns-a.iij.ad.jp, dns21jp.nikon.com
NameserverAddressesNetwork (AS)Glue
dns-a.iij.ad.jp210.138.20.110 202.32.219.50 2001:240:bb81::29:110 2001:240:bb81::28:50AS2497 IIJ - Internet Initiative Japan Inc., JP AS2497 IIJ - Internet Initiative Japan Inc., JP AS2497 IIJ - Internet Initiative Japan Inc., JP AS2497 IIJ - Internet Initiative Japan Inc., JP-
dns21jp.nikon.com202.55.139.120AS38643 U-Cloud - UNIADEX, LTD., JP202.55.139.120

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: dns-a.iij.ad.jp, dns21jp.nikon.com.
    #6
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: dns21jp.nikon.com.
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • i
    One address family in one network
    all IPv6 addresses are in 2001:240:bb81::/48, while the other address family is spread over several networks.
    #10
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS2497 (IIJ - Internet Initiative Japan Inc., JP): 4 addresses; AS38643 (U-Cloud - UNIADEX, LTD., JP): 1 address.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .com, .jp.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: dns21jp.nikon.com.
    #13

Nameservers

fail

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-a.iij.ad.jp 210.138.20.110NOERROR, 22 ms, authoritativenoyes / yesrefusedIIJ_DNS_PLATFORM_SERVICE_K
dns-a.iij.ad.jp 202.32.219.50NOERROR, 208 ms, authoritativenoyes / yesrefused-
dns-a.iij.ad.jp 2001:240:bb81::29:110NOERROR, 26 ms, authoritativenono / yesrefusedIIJ_DNS_PLATFORM_SERVICE_K
dns-a.iij.ad.jp 2001:240:bb81::28:50NOERROR, 239 ms, authoritativenoyes / yesrefused-
dns21jp.nikon.com 202.55.139.120NOERROR, 236 ms, authoritativenoyes / yesrefusedunknown

Checks

  • ✓ All respond #14
    All 5 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-a.iij.ad.jp: "IIJ_DNS_PLATFORM_SERVICE_K"; dns21jp.nikon.com: "unknown".
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: dns-a.iij.ad.jp (2001:240:bb81::29:110): read tcp [2a01:4f8:1c1c:eebf::1]:53170->[2001:240:bb81::29:110]:53: read: connection reset by peer.
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

warn

serial 2026091701 · primary dns21jp.nikon.com

Found

Primary (MNAME)
dns21jp.nikon.com
Contact (RNAME)
postmaster.nikon.com
Serial
2026091701
Refresh / retry
600 s / 1800 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
dns-a.iij.ad.jp (210.138.20.110)2026091701
dns-a.iij.ad.jp (202.32.219.50)2026091701
dns-a.iij.ad.jp (2001:240:bb81::29:110)2026091701
dns-a.iij.ad.jp (2001:240:bb81::28:50)2026091701
dns21jp.nikon.com (202.55.139.120)2026091701

Checks

  • ✓ Serial 2026091701 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    refresh 10m is outside 20m–1d; retry 30m should be shorter than refresh 10m. Current values: refresh 10m, retry 30m, expire 14d, negative TTL 1h.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns21jp.nikon.com is one of the listed nameservers.
  • ✓ Contact postmaster@nikon.com #25
    The SOA RNAME postmaster.nikon.com means postmaster@nikon.com.
  • ✓ Date-based serial #26
    The serial 2026091701 follows the YYYYMMDDnn convention (2026-09-17).

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

info

32 records at the apex

Found

Read from
210.138.20.110:53
TypeValueTTL
SOAdns21jp.nikon.com. postmaster.nikon.com. 2026091701 600 1800 1209600 36003600
NSdns21jp.nikon.com.3600
NSdns-a.iij.ad.jp.3600
A15.197.198.503600
A3.33.230.1423600
MX10 mxb-00620203.gslb.pphosted.com.3600
MX10 mxa-00620203.gslb.pphosted.com.3600
TXT"d365mktkey=N4OwOt7BR3fE9NmcXtzxbz2F1nfpqFfuxCaxQItxx6Yx"3600
TXT"d365mktkey=tCe9nFKWUh0OxaeTRh7EvtxwziXxx4RzUKtBjgfSubIx"3600
TXT"adobe-sign-verification=fa1b520ea9d7f5019a2fea0dd98f67f3"3600
TXT"miro-verification=2833ecb4d0a1842fcf5638260f23131322afb5ae"3600
TXT"smartsheet-site-validation=LESlhrP53t6KbqsLwsyjYO5iqvQVrQwf"3600
TXT"teamviewer-sso-verification=8d5c44e08f344c108c17be4cbcae58eb"3600
TXT"adobe-idp-site-verification=ce639885-5dda-4983-93b2-60ceb7dd217d"3600
TXT"google-site-verification=3k7pXiI0IA9MR1lRW20M7IUelUiE-II6EwAK8ynUs10"3600
TXT"google-site-verification=KQVCRTFLOXLAE71ZbV15-X9pTcU9atHNnC5ED5IWig8"3600
TXT"duo_sso_verification=jg5ZcZpdmzNyfuDyo7eLPVpF94fLF2s9OOfgc4qjMTjAEXiFURvlUcdYOCyJyOpM"3600
TXT"sending_domain1112082=91388872cbeb18cd368a98d4225519745bebdd6a37b613e5f56837d3677de506"3600
TXT"LAuwgQGH5eFEJ4esSpOAC33HhTbJE52/QkkrEZjBE1YQMU104NoU8evtmSKT9Mjz/GmFJ9HUU8W2bYkGy7BbIA=="3600
TXT"nulab-verification-code=5RbeahcvNNpBHLnX7xkbjzhzi0eCrIw6c47xtb5OUoSInkzErswKBvM49rE7Znxn"3600
TXT"Atlassian-domain-verification=oK7p3nqJr3r98aYhpKp0mNVoKpbNTu0aM94uVjtYq8BxrapBww1jtanvaE3ttIUR"3600
TXT"atlassian-domain-verification=Jyw2hl607rJ49NPy49mvueGBeKmdmtmi3i7yossl8XMc1aYOIM/hHA6nCy98ZZ6l"3600
TXT"atlassian-domain-verification=NAy36jafR69KaCCaEnx6UjuTOPyPh/RIEQIiYFR2y40c9T1raq7anAVC7YAoflrw"3600
TXT"atlassian-domain-verification=lghccBJxkezdyLDIZMu2F7JtfTLMjGI4ltdRYKLmY06O/QWvY0rUnfPjKyzQynTs"3600
TXT"v=spf1 ip4:66.159.235.157 ip4:66.159.246.31 ip4:205.220.175.202 ip4:205.220.163.203 ip4:205.220.177.10 ip4:205.220.165.10 ip4:143.55.146.95 ip4:143.55.149.5 ip4:148.163.157.185 ip4:148.163.159.149 ip4:67.231.145.117 ip4:208.86.201.73 " "ip4:202.55.137.94 ip4:202.55.138.93 ip4:202.55.138.94 ip4:202.55.139.102 ip4:202.55.139.118 ip4:202.55.139.120 " "ip4:4.241.96.193 ip4:48.210.84.68 ip4:20.222.105.192 ip4:61.113.120.160/29 " "ip4:46.34.80.160/30 ip4:66.11.133.41 ip4:66.11.133.42 " "ip4:18.168.51.200 ip4:18.168.140.58 ip4:148.59.101.16/28 ip4:58.80.8.125 ip4:160.17.14.67 " "ip4:13.71.133.58 ip4:210.166.72.24/31 ip4:210.166.72.35 ip4:210.166.72.36/31 " "include:spf.protection.outlook.com " "ip4:103.239.16.0/26 ip4:103.239.16.64/26 ip4:52.193.161.140 ip4:54.238.138.18 ip4:52.192.185.134 ip4:3.115.118.190 " "ip4:103.2.52.0/23 ip4:158.201.232.0/22 ip4:158.201.238.0/23 ip4:158.201.247.96/27 ip4:158.201.247.128/26 ip4:158.201.250.0/22 ip4:203.133.232.0/21 ip4:210.171.0.0/22 ip4:210.171.6.208/28 ip4:210.171.13.0/25 ip4:210.171.15.128/26 ip4:210.171.21.0/24 " "ip4:13.112.173.97 ip4:13.114.237.143 ip4:18.99.64.208/29 ip4:35.72.25.0/24 ip4:35.72.75.115 ip4:52.69.196.84 ip4:52.198.79.8 ip4:54.95.172.92 " "ip4:149.72.113.121 ip4:159.183.221.130 ip4:209.222.82.0/24 " "ip4:20.97.70.227 ip4:20.98.2.159 ip4:20.98.33.77 ip4:40.124.2.148 ip4:52.240.209.173 ip4:52.252.238.67 " "ip4:58.191.37.0/24 ip4:58.191.38.0/24 ip4:58.191.39.0/24 ip4:58.191.56.0/24 ip4:121.87.8.0/24 ip4:121.87.10.0/24 ip4:121.87.12.0/24 ip4:121.87.20.0/24 ip4:121.87.22.0/24 ip4:121.87.24.0/24 ip4:121.87.26.0/24 ip4:121.87.51.0/24 " "ip4:128.27.33.0/24 ip4:128.27.34.0/24 ip4:128.27.35.0/24 ip4:128.27.36.0/24 ip4:128.27.37.0/24 ip4:218.251.75.0/24 " "include:_spf2.nikon.com include:_spf3.nikon.com ?all"3600
TXT"_3phej7e7zjz9ghaw30wzlds7jkgod2n"3600
TXT"msfpkey=wkz0zeniwawx7t9svbc8ygq3"3600
TXT"ZOOM_verify_g86BQSsokGXUhN5xnpfbRZ"3600
TXT"32c1d8fb-8a95-4b1e-8d24-566fc8fde922"3600
TXT"asv=8fdc303ce8c894ba1b14a37344e52e18"3600
TXT"apple-domain-verification=ZFoB3isIddfv2E4F"3600
TXT"brevo-code:a01543f8c9aab266ddc217ee98d42315"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 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.
  • ✓ 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