DNS Report for pku.edu.cn

• DNS.PKU.EDU.CN

  • IPv4: 162.105.129.26
  • IPv6: 2001:da8:201:1129::26
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): 30 seconds
  • Recursive: N/A

• DNS2.PKU.EDU.CN

  • IPv4: 162.105.129.122
  • IPv6: 2001:da8:201:1129::122
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): 30 seconds
  • Recursive: N/A

• ns.PKU.EDU.CN

  • IPv4: 162.105.129.130
  • IPv6: 2001:da8:201:1129::a269:8182
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): 30 seconds
  • Recursive: N/A

Nameserver Count - OK

• DNS.PKU.EDU.CN

  • Status: Responded
  • IP(s): 162.105.131.160
  • TTL: 300 seconds
  • Recursive Queries: Does not allow recursive queries
  • TCP Connectivity: TCP connection failed (Response code: REFUSED)

• DNS2.PKU.EDU.CN

  • Status: Responded
  • IP(s): 162.105.131.160
  • TTL: 300 seconds
  • Recursive Queries: Does not allow recursive queries
  • TCP Connectivity: TCP connection failed (Response code: REFUSED)

• ns.PKU.EDU.CN

  • Status: Responded
  • IP(s): 162.105.131.160
  • TTL: 300 seconds
  • Recursive Queries: Does not allow recursive queries
  • TCP Connectivity: TCP connection failed (Response code: REFUSED)

DNS.PKU.EDU.CN

• Serial: 2024083001
• Refresh: 3600
• Retry: 300
• Expire: 86400
• Minimum TTL: 3600

DNS2.PKU.EDU.CN

• Serial: 2024083001
• Refresh: 3600
• Retry: 300
• Expire: 86400
• Minimum TTL: 3600

ns.PKU.EDU.CN

• Serial: 2024083001
• Refresh: 3600
• Retry: 300
• Expire: 86400
• Minimum TTL: 3600

Serial: 2024083001 - OK

REFRESH: 3600 - OK

RETRY: 300 - OK

EXPIRE: 86400 - OK

MINIMUM TTL: 3600 - OK

DNS.PKU.EDU.CN

• 10 mx1.pku.edu.cn ( 162.105.129.21 )
• 10 mx2.pku.edu.cn ( 162.105.129.22 )

DNS2.PKU.EDU.CN

• 10 mx1.pku.edu.cn ( 162.105.129.21 )
• 10 mx2.pku.edu.cn ( 162.105.129.22 )

ns.PKU.EDU.CN

• 10 mx1.pku.edu.cn ( 162.105.129.21 )
• 10 mx2.pku.edu.cn ( 162.105.129.22 )

MX Record Consistency - OK

MX Record Count - OK

• 21.129.105.162.in-addr.arpa -> No PTR record found: The DNS query name does not exist: 21.129.105.162.in-addr.arpa.
• 22.129.105.162.in-addr.arpa -> No PTR record found: The DNS query name does not exist: 22.129.105.162.in-addr.arpa.

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 ip4:162.105.129.0/24 include:spf.icoremail.net -all
• SPF Syntax: Passed
• Deprecated Elements: Passed
• IP Addresses: 162.105.129.0/24
• Includes: spf.icoremail.net
• DNS Lookups: 3
• Void Lookups: Passed
• Escaping Chars: Not Present
• All Mechanism: -all

• 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.