DNS Report for tsinghua.edu.cn

• dns2.tsinghua.edu.cn

  • IPv4: 166.111.8.31
  • IPv6: 2402:f000:1:801::8:31
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): 30 seconds
  • Recursive: N/A

• dns2.edu.cn

  • IPv4: 202.112.0.13
  • IPv6: 2001:da8:1:100::13
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): 30 seconds
  • Recursive: N/A

• ns5.cernet.net

  • IPv4: 166.111.8.30, 137.189.6.21
  • IPv6: 2402:f000:1:801::8:30, 2405:3000:3:6::15
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): 30 seconds
  • Recursive: N/A

• dns.tsinghua.edu.cn

  • IPv4: 166.111.8.30
  • IPv6: 2402:f000:1:801::8:30
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): 30 seconds
  • Recursive: N/A

• dns.edu.cn

  • IPv4: 202.38.109.35
  • IPv6: 2001:250:c006::35
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): 30 seconds
  • Recursive: N/A

Nameserver Count - OK

• dns2.tsinghua.edu.cn

  • Status: Failed: The DNS response does not contain an answer to the question: tsinghua.edu.cn. IN A
  • IP(s):
  • TTL: N/A seconds
  • Recursive Queries: Does not allow recursive queries
  • TCP Connectivity: TCP connection failed (Response code: REFUSED)

• dns2.edu.cn

  • Status: Failed: The DNS response does not contain an answer to the question: tsinghua.edu.cn. IN A
  • IP(s):
  • TTL: N/A seconds
  • Recursive Queries: Does not allow recursive queries
  • TCP Connectivity: TCP connection failed: The DNS operation timed out.

• ns5.cernet.net

  • Status: Failed: The DNS response does not contain an answer to the question: tsinghua.edu.cn. IN A
  • IP(s):
  • TTL: N/A seconds
  • Recursive Queries: Error checking recursive queries: The DNS operation timed out.
  • TCP Connectivity: TCP connection failed (Response code: REFUSED)

• dns.tsinghua.edu.cn

  • Status: Failed: The DNS response does not contain an answer to the question: tsinghua.edu.cn. IN A
  • IP(s):
  • TTL: N/A seconds
  • Recursive Queries: Error checking recursive queries: The DNS operation timed out.
  • TCP Connectivity: TCP connection failed (Response code: REFUSED)

• dns.edu.cn

  • Status: Failed: The DNS response does not contain an answer to the question: tsinghua.edu.cn. IN A
  • IP(s):
  • TTL: N/A seconds
  • Recursive Queries: Does not allow recursive queries
  • TCP Connectivity: TCP connection failed: The DNS operation timed out.

dns2.tsinghua.edu.cn

• Serial: 2099125864
• Refresh: 3600
• Retry: 900
• Expire: 604800
• Minimum TTL: 600

dns2.edu.cn

• Serial: 2099125864
• Refresh: 3600
• Retry: 900
• Expire: 604800
• Minimum TTL: 600

ns5.cernet.net

• Serial: 2099125864
• Refresh: 3600
• Retry: 900
• Expire: 604800
• Minimum TTL: 600

dns.tsinghua.edu.cn

• Serial: 2099125864
• Refresh: 3600
• Retry: 900
• Expire: 604800
• Minimum TTL: 600

dns.edu.cn

• Serial: 2099125864
• Refresh: 3600
• Retry: 900
• Expire: 604800
• Minimum TTL: 600

Serial: 2099125864 - OK

REFRESH: 3600 - OK

RETRY: 900 - OK

EXPIRE: 604800 - OK

MINIMUM TTL: 600 - Note: Outside recommended range (1-3 hours)

dns2.tsinghua.edu.cn

• 10 mta0.tsinghua.edu.cn ( 166.111.204.8 )
• 10 mta1.tsinghua.edu.cn ( 166.111.204.9 )

dns2.edu.cn

• 10 mta0.tsinghua.edu.cn ( 166.111.204.8 )
• 10 mta1.tsinghua.edu.cn ( 166.111.204.9 )

ns5.cernet.net

• 10 mta0.tsinghua.edu.cn ( 166.111.204.8 )
• 10 mta1.tsinghua.edu.cn ( 166.111.204.9 )

dns.tsinghua.edu.cn

• 10 mta0.tsinghua.edu.cn ( 166.111.204.8 )
• 10 mta1.tsinghua.edu.cn ( 166.111.204.9 )

dns.edu.cn

• 10 mta0.tsinghua.edu.cn ( 166.111.204.8 )
• 10 mta1.tsinghua.edu.cn ( 166.111.204.9 )

MX Record Consistency - OK

MX Record Count - OK

• 8.204.111.166.in-addr.arpa -> sea.net.edu.cn
• 9.204.111.166.in-addr.arpa -> mails.tsinghua.edu.cn

PTR Records - OK

• Signed: No
• Validation: Failed
• DNSKEY Records: None
• DS Records in parent zone: None
• DS at Parent: None

DNSSEC - Note: Domain is not signed with DNSSEC

Error: No DNSSEC records found

SPF Record Published: Passed

Multiple SPF Records: Passed

SPF Record 1:

• Record: v=spf1 redirect=spf.tsinghua.edu.cn
• SPF Syntax: Failed
• Deprecated Elements: Passed
• IP Addresses:
• Includes:
• DNS Lookups: 1
• Void Lookups: Passed
• Escaping Chars: Not Present
• All Mechanism: Not Present

Warnings:

• SPF record doesn't contain an 'all' mechanism

Errors:

• SPF record syntax is invalid

• DKIM Records Found: No

Warnings:

• No DKIM records found for common selectors

• Record: v=DMARC1; p=none; fo=1; ruf=mailto:[email protected]; rua=mailto:[email protected]
• Syntax: Valid
• Policy: none
• RUA (Aggregate Reports): mailto:[email protected]
• RUF (Forensic Reports): mailto:[email protected]
• Failure Options (fo): 1

DMARC External Validation:

• All external domains in your DMARC record are giving permission to send them DMARC reports.