DNS Report for stackoverflow.com

• damian.ns.cloudflare.com

  • IPv4: 162.159.44.50, 172.64.35.50, 108.162.195.50
  • IPv6: 2606:4700:58::a29f:2c32, 2803:f800:50::6ca2:c332, 2a06:98c1:50::ac40:2332
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): 30 seconds
  • Recursive: N/A

• sureena.ns.cloudflare.com

  • IPv4: 108.162.194.126, 172.64.34.126, 162.159.38.126
  • IPv6: 2803:f800:50::6ca2:c27e, 2606:4700:50::a29f:267e, 2a06:98c1:50::ac40:227e
  • TTL (IPv4): 30 seconds
  • TTL (IPv6): 30 seconds
  • Recursive: N/A

Nameserver Count - OK

• damian.ns.cloudflare.com

  • Status: Responded
  • IP(s): 172.64.155.249, 104.18.32.7
  • TTL: 300 seconds
  • Recursive Queries: Allows recursive queries
  • TCP Connectivity: Allows TCP connections

• sureena.ns.cloudflare.com

  • Status: Responded
  • IP(s): 104.18.32.7, 172.64.155.249
  • TTL: 300 seconds
  • Recursive Queries: Allows recursive queries
  • TCP Connectivity: Allows TCP connections

damian.ns.cloudflare.com

• Serial: 2347709915
• Refresh: 10000
• Retry: 2400
• Expire: 604800
• Minimum TTL: 1800

sureena.ns.cloudflare.com

• Serial: 2347709915
• Refresh: 10000
• Retry: 2400
• Expire: 604800
• Minimum TTL: 1800

Serial: 2347709915 - OK

REFRESH: 10000 - OK

RETRY: 2400 - OK

EXPIRE: 604800 - OK

MINIMUM TTL: 1800 - Note: Outside recommended range (1-3 hours)

damian.ns.cloudflare.com

• 1 aspmx.l.google.com ( 172.253.63.27 )
• 5 alt1.aspmx.l.google.com ( 209.85.202.27 )
• 5 alt2.aspmx.l.google.com ( 64.233.184.26 )
• 10 alt3.aspmx.l.google.com ( 142.250.27.27 )
• 10 alt4.aspmx.l.google.com ( 142.250.153.26 )

sureena.ns.cloudflare.com

• 1 aspmx.l.google.com ( 142.251.111.26 )
• 5 alt1.aspmx.l.google.com ( 209.85.202.27 )
• 5 alt2.aspmx.l.google.com ( 64.233.184.26 )
• 10 alt3.aspmx.l.google.com ( 142.250.27.27 )
• 10 alt4.aspmx.l.google.com ( 142.250.153.27 )

MX Record Consistency - Warning: Inconsistencies found

MX Record Count - OK

• 26.111.251.142.in-addr.arpa -> bk-in-f26.1e100.net
• 26.153.250.142.in-addr.arpa -> ea-in-f26.1e100.net
• 27.27.250.142.in-addr.arpa -> ra-in-f27.1e100.net
• 27.202.85.209.in-addr.arpa -> dg-in-f27.1e100.net
• 26.184.233.64.in-addr.arpa -> wa-in-f26.1e100.net
• 27.63.253.172.in-addr.arpa -> bi-in-f27.1e100.net
• 27.153.250.142.in-addr.arpa -> ea-in-f27.1e100.net

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 ip4:198.252.206.0/24 include:_spf1.stackoverflow.com ~all
• SPF Syntax: Passed
• Deprecated Elements: Passed
• IP Addresses: 198.252.206.0/24
• Includes: _spf1.stackoverflow.com
• DNS Lookups: 3
• Void Lookups: Passed
• Escaping Chars: Not Present
• All Mechanism: ~all

• DKIM Records Found: Yes
• Selectors Found: google
• Selector 'google':
  Record: v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCbf2b+8IwDGfgu5u/9kY4d3Corv9C2UtQyLWqHer1vNmWprWnjHDNWwE7nL943WOdDSGGhwKrprrFbCJrHsZ8Yz+UR52zeySiwJi7eIoVl6SDa6DXSlh2bYKwgJUuCF5blhY8weRwpf0wAKK8i9TmZbx+5vBZ2tAGAa1MW6VkFDwIDAQAB
• Valid Syntax: Yes

• Record: v=DMARC1; p=reject; pct=100; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1
• Syntax: Valid
• Policy: reject
• Percent: 100%
• 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.