DNS Report for ubuntu.com

• ns2.canonical.com

  • IPv4: 185.125.190.66
  • IPv6: 2620:2d:4000:1::44
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): 30 seconds
  • Recursive: N/A

• ns3.canonical.com

  • IPv4: 91.189.91.139
  • IPv6: No IPv6 found
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): N/A seconds
  • Recursive: N/A

• ns1.canonical.com

  • IPv4: 185.125.190.65
  • IPv6: 2620:2d:4000:1::43
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): 30 seconds
  • Recursive: N/A

Nameserver Count - OK

• ns2.canonical.com

  • Status: Responded
  • IP(s): 185.125.190.29, 185.125.190.21, 185.125.190.20
  • TTL: 60 seconds
  • Recursive Queries: Does not allow recursive queries
  • TCP Connectivity: TCP connection failed (Response code: REFUSED)

• ns3.canonical.com

  • Status: Responded
  • IP(s): 185.125.190.20, 185.125.190.21, 185.125.190.29
  • TTL: 60 seconds
  • Recursive Queries: Does not allow recursive queries
  • TCP Connectivity: TCP connection failed (Response code: REFUSED)

• ns1.canonical.com

  • Status: Responded
  • IP(s): 185.125.190.21, 185.125.190.20, 185.125.190.29
  • TTL: 60 seconds
  • Recursive Queries: Does not allow recursive queries
  • TCP Connectivity: TCP connection failed (Response code: REFUSED)

ns2.canonical.com

• Serial: 2018058261
• Refresh: 10800
• Retry: 3600
• Expire: 604800
• Minimum TTL: 3600

ns3.canonical.com

• Serial: 2018058261
• Refresh: 10800
• Retry: 3600
• Expire: 604800
• Minimum TTL: 3600

ns1.canonical.com

• Serial: 2018058261
• Refresh: 10800
• Retry: 3600
• Expire: 604800
• Minimum TTL: 3600

Serial: 2018058261 - OK

REFRESH: 10800 - OK

RETRY: 3600 - OK

EXPIRE: 604800 - OK

MINIMUM TTL: 3600 - OK

ns2.canonical.com

• 10 mx.ubuntu.com ( 185.125.188.73 )

ns3.canonical.com

• 10 mx.ubuntu.com ( 185.125.188.72 )

ns1.canonical.com

• 10 mx.ubuntu.com ( 185.125.188.72 )

MX Record Consistency - Warning: Inconsistencies found

MX Record Count - Warning: Only one MX record

• 73.188.125.185.in-addr.arpa -> smtp-mx-ubuntu-1.canonical.com
• 72.188.125.185.in-addr.arpa -> smtp-mx-ubuntu-0.canonical.com

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 include:canonical.com +all
• SPF Syntax: Passed
• Deprecated Elements: Passed
• IP Addresses:
• Includes: canonical.com
• DNS Lookups: 4
• Void Lookups: Passed
• Escaping Chars: Not Present
• All Mechanism: +all

Warnings:

• SPF record ends with '+all', which is overly permissive

• DKIM Records Found: No

Warnings:

• No DKIM records found for common selectors

• Record: v=DMARC1; p=none; pct=100; rua=mailto:[email protected]
• Syntax: Valid
• Policy: none
• Percent: 100%
• RUA (Aggregate Reports): mailto:[email protected]

DMARC External Validation:

• Invalid external domains: admin.canonical.com

Warnings:

• Some external domains are not properly configured to receive DMARC reports: admin.canonical.com