DNS Report for fbcdn.net

• d.ns.facebook.com

  • IPv4: 185.89.219.12
  • IPv6: 2a03:2880:f1fd:c:face:b00c:0:35
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): 30 seconds
  • Recursive: N/A

• a.ns.facebook.com

  • IPv4: 129.134.30.12
  • IPv6: 2a03:2880:f0fc:c:face:b00c:0:35
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): 30 seconds
  • Recursive: N/A

• c.ns.facebook.com

  • IPv4: 185.89.218.12
  • IPv6: 2a03:2880:f1fc:c:face:b00c:0:35
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): 30 seconds
  • Recursive: N/A

• b.ns.facebook.com

  • IPv4: 129.134.31.12
  • IPv6: 2a03:2880:f0fd:c:face:b00c:0:35
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): 30 seconds
  • Recursive: N/A

Nameserver Count - OK

• d.ns.facebook.com

  • Status: Responded
  • IP(s): 157.240.229.35
  • TTL: 60 seconds
  • Recursive Queries: Does not allow recursive queries
  • TCP Connectivity: TCP connection failed (Response code: REFUSED)

• a.ns.facebook.com

  • Status: Responded
  • IP(s): 157.240.229.35
  • TTL: 60 seconds
  • Recursive Queries: Does not allow recursive queries
  • TCP Connectivity: TCP connection failed (Response code: REFUSED)

• c.ns.facebook.com

  • Status: Responded
  • IP(s): 157.240.229.35
  • TTL: 60 seconds
  • Recursive Queries: Does not allow recursive queries
  • TCP Connectivity: TCP connection failed (Response code: REFUSED)

• b.ns.facebook.com

  • Status: Responded
  • IP(s): 157.240.229.35
  • TTL: 60 seconds
  • Recursive Queries: Does not allow recursive queries
  • TCP Connectivity: TCP connection failed (Response code: REFUSED)

d.ns.facebook.com

• Serial: 4207849484
• Refresh: 14400
• Retry: 1800
• Expire: 604800
• Minimum TTL: 300

a.ns.facebook.com

• Serial: 4207849484
• Refresh: 14400
• Retry: 1800
• Expire: 604800
• Minimum TTL: 300

c.ns.facebook.com

• Serial: 4207849484
• Refresh: 14400
• Retry: 1800
• Expire: 604800
• Minimum TTL: 300

b.ns.facebook.com

• Serial: 4207849484
• Refresh: 14400
• Retry: 1800
• Expire: 604800
• Minimum TTL: 300

Serial: 4207849484 - OK

REFRESH: 14400 - OK

RETRY: 1800 - OK

EXPIRE: 604800 - OK

MINIMUM TTL: 300 - Note: Outside recommended range (1-3 hours)

d.ns.facebook.com

Error: The DNS response does not contain an answer to the question: fbcdn.net. IN MX

a.ns.facebook.com

Error: The DNS response does not contain an answer to the question: fbcdn.net. IN MX

c.ns.facebook.com

Error: The DNS response does not contain an answer to the question: fbcdn.net. IN MX

b.ns.facebook.com

Error: The DNS response does not contain an answer to the question: fbcdn.net. IN MX

MX Record Consistency - OK

MX Record Count - OK

No PTR records data available.

• 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 a ~all
• SPF Syntax: Failed
• Deprecated Elements: Passed
• IP Addresses:
• Includes:
• DNS Lookups: 2
• Void Lookups: Passed
• Escaping Chars: Not Present
• All Mechanism: ~all

Errors:

• SPF record syntax is invalid

• DKIM Records Found: No

Warnings:

• No DKIM records found for common selectors

• Record: v=DMARC1; p=none; sp=none; rua=mailto:[email protected]
• Syntax: Valid
• Policy: none
• Subdomain Policy: none
• RUA (Aggregate Reports): mailto:[email protected]

DMARC External Validation:

• Invalid external domains: dmarc.facebookmail.com

Warnings:

• Some external domains are not properly configured to receive DMARC reports: dmarc.facebookmail.com