Domain diagnostics cl-system.jp

Diagnose potential problems with a given domain.

You can bookmark this utility as diag.domains.

Global nameservers

Google Public DNS

dns.cl-system.jp (2025032301, TTL: 3600)

Cloudflare DNS

dns.cl-system.jp (2025032301, TTL: 3600)

Quad9

dns.cl-system.jp (2025032301, TTL: 3600)

ns1.simply.com

DNS request failed: The name server refuses to perform the specified operation for policy reasons.

ns2.simply.com

DNS request failed: The name server refuses to perform the specified operation for policy reasons.

ns3.simply.com

DNS request failed: The name server refuses to perform the specified operation for policy reasons.

External tests

DNS zone As seen by Google Public DNS

Webservers

cl-system.jp
Host Target Reverse
cl-system.jp 160.251.122.192 v160-251-122-192.myvps.jp
www.cl-system.jp
Host Target Reverse
www.cl-system.jp 160.251.122.192 v160-251-122-192.myvps.jp

Inbound mail

Host # Target IP Reverse
cl-system.jp 5 mail.cl-system.jp 160.251.122.192 v160-251-122-192.myvps.jp

Outbound mail

SPF record

Value
v=spf1 a mx a:cl-system.jp ip4:160.251.122.192 ip4:160.251.122.192 ip6:fe80::f816:3eff:fe5b:a37 ?all
No Simply.com SPF record found

DKIM records

Simply.com DKIM records not found
Name Value

DMARC record

No DMARC record found

TXT records

Name Value
cl-system.jp SPF v=spf1 a mx a:cl-system.jp ip4:160.251.122.192 ip4:160.251.122.192 ip6:fe80::f816:3eff:fe5b:a37 ?all

Nameservers

Host Nameserver
cl-system.jp dns.cl-system.jp

WHOIS

[ JPRS database provides information on network administration. Its use is    ]
[ restricted to network administration purposes. For further information,     ]
[ use 'whois -h whois.jprs.jp help'. To suppress Japanese output, add'/e'     ]
[ at the end of command, e.g. 'whois -h whois.jprs.jp xxx/e'.                 ]
Domain Information:
[Domain Name]                   CL-SYSTEM.JP

[Registrant]                    (Not displayed by registrant's request)
                                For details -> https://jprs.jp/about/dom-rule/whois-concealment/ (only in Japanese)

[Name Server]                   dns.cl-system.jp
[Name Server]                   2nd.dnsv.jp
[Signing Key]                   

[Created on]                    2021/07/07
[Expires on]                    2026/07/31
[Status]                        Active
[Last Updated]                  2025/08/01 01:05:04 (JST)

Contact Information:
[Name]                          Whois Privacy Protection Service by onamae.com
[Email]                         cl-system.jp -@- whoisprotectservice.com
[Web Page]                       
[Postal code]                   150-8512
[Postal Address]                Shibuya-ku
                                26-1 Sakuragaoka-cho
                                Cerulean Tower 11F
[Phone]                         +81.354562560
[Fax]

WHOIS result is cached for 15 minutes

RDAP

Unable to get RDAP data.

RDAP result is cached for 15 minutes

HTTP trace

1
http://cl-system.jp
HTTP 301
160.251.122.192
Namelookup
1,261 ms
Connect
1,500 ms
Pre-transfer
1,500 ms
Start-transfer (TTFB)
1,740 ms
HTTP/1.1 301 Moved Permanently
Date: Thu, 30 Oct 2025 20:47:30 GMT
Server: Apache
Location: https://cl-system.jp/
Content-Length: 229
Content-Type: text/html; charset=iso-8859-1
2
https://cl-system.jp/
HTTP 200
160.251.122.192
Namelookup
259 ms
Connect
502 ms
App connect
758 ms
Pre-transfer
758 ms
Start-transfer (TTFB)
1,065 ms
HTTP/1.1 200 OK
Date: Thu, 30 Oct 2025 20:47:31 GMT
Server: Apache
Link: <https://cl-system.jp/wp-json/>; rel="https://api.w.org/", <https://cl-system.jp/wp-json/wp/v2/pages/135>; rel="alternate"; title="JSON"; type="application/json", <https://cl-system.jp/>; rel=shortlink
Set-Cookie: __wpdm_client=ca9abf449f35196345f929223b5de203; path=/; secure; HttpOnly
Upgrade: h2,h2c
Connection: Upgrade
Vary: Accept-Encoding
Transfer-Encoding: chunked
Content-Type: text/html; charset=UTF-8