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DNS Report for fb.com

Date Generated: 2024-07-06 20:15:31
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Nameservers

  • 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
  • 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
  • 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

Nameserver Count - OK

Nameserver Queries

  • 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)
  • 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)
  • 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)

SOA Records

d.ns.facebook.com
  • Serial: 4207849484
  • Refresh: 14400
  • Retry: 1800
  • Expire: 604800
  • Minimum TTL: 3600
c.ns.facebook.com
  • Serial: 4207849484
  • Refresh: 14400
  • Retry: 1800
  • Expire: 604800
  • Minimum TTL: 3600
b.ns.facebook.com
  • Serial: 4207849484
  • Refresh: 14400
  • Retry: 1800
  • Expire: 604800
  • Minimum TTL: 3600
a.ns.facebook.com
  • Serial: 4207849484
  • Refresh: 14400
  • Retry: 1800
  • Expire: 604800
  • Minimum TTL: 3600

Serial: 4207849484 - OK

REFRESH: 14400 - OK

RETRY: 1800 - OK

EXPIRE: 604800 - OK

MINIMUM TTL: 3600 - OK

MX Records

d.ns.facebook.com
c.ns.facebook.com
b.ns.facebook.com
a.ns.facebook.com

MX Record Consistency - Warning: Inconsistencies found

MX Record Count - OK

Reverse MX A records (PTR)

  • 30.153.231.67.in-addr.arpa -> mx0b-00082601.pphosted.com
  • 42.145.231.67.in-addr.arpa -> mx0a-00082601.pphosted.com
  • 42.145.231.67.in-addr.arpa -> mx0a-00082601.pphosted.com
  • 30.153.231.67.in-addr.arpa -> mx0b-00082601.pphosted.com

PTR Records - OK

DNSSEC

DNSSEC Inspector
  • 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 (Sender Policy Framework)

SPF Record Published: Passed

Multiple SPF Records: Passed

SPF Record 1:
  • Record: v=spf1 redirect=_spf.fb.com
  • SPF Syntax: Failed
  • Deprecated Elements: Passed
  • IP Addresses:
  • Includes:
  • DNS Lookups: 0
  • 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 (DomainKeys Identified Mail)

  • DKIM Records Found: Yes
  • Selectors Found: google
  • Selector 'google':
    Record: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA0BvvGggwjm+X9FLAB0cA8kZCtRYrjeCsdBb4mFGZUn6sO5OCvLTFHa6MVHlYU46df
  • Valid Syntax: Yes

DMARC

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