Domain diagnostics 51z1z.cn

Diagnose potential issues with a given domain.

You can bookmark this tool as diag.domains .

Global name servers

Google Public DNS

a.share-dns.com (1764233334, TTL: 600)

Cloudflare DNS

a.share-dns.com (1764233334, TTL: 600)

Quad9

a.share-dns.com (1764233334, TTL: 600)

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

Web servers

51z1z.cn
Host Goal Reverse
51z1z.cn 154.89.104.78 -
www.51z1z.cn
Host Goal Reverse
www.51z1z.cn 154.89.104.78 -

Incoming mail

No MX records found

Outgoing mail

SPF record

SPF issue: No SPF record found

DKIM records

Simply.com DKIM records not found

DMARC record

No DMARC record found

TXT records

Nameservers

Host Nameserver
51z1z.cn b.share-dns.net
51z1z.cn a.share-dns.com

WHOIS

Domain Name: 51z1z.cn
ROID: 20220415s10001s47478165-cn
Domain Status: clientTransferProhibited
Registrant: 臧谋国
Registrant Contact Email: wy88813142022 -@- 163.com
Sponsoring Registrar: Dynadot Inc
Name Server: b.share-dns.net
Name Server: a.share-dns.com
Registration Time: 2022-04-15 04:06:09
Expiration Time: 2027-04-15 04:06:09
DNSSEC: unsigned

WHOIS result is cached for 15 minutes

RDAP

Could not retrieve RDAP data.

RDAP result is cached for 15 minutes

HTTP trace

1
http://51z1z.cn
HTTP 301
154.89.104.78
Namelookup
41 ms
Connect
293 ms
Pre-transfer
293 ms
Start-transfer (TTFB)
546 ms
HTTP/2 301 Moved Permanently
content-type: text/html; charset=UTF-8
location: http://www.51z1z.cn
server: Microsoft-IIS/8.5
x-powered-by: ASP.NET
date: Sun, 17 May 2026 04:40:12 GMT
content-length: 142
2
http://www.51z1z.cn
HTTP 200
154.89.104.78
Namelookup
25 ms
Connect
274 ms
Pre-transfer
274 ms
Start-transfer (TTFB)
703 ms
HTTP/2 200 OK
content-type: text/html
content-encoding: gzip
vary: Accept-Encoding
server: Microsoft-IIS/8.5
x-powered-by: PHP/5.2.17, ASP.NET
date: Sun, 17 May 2026 04:40:13 GMT
content-length: 9380
2
Requests
1
Redirects
1,249 ms
Total time
200
Final status