DNS records for github.io

Findings

[INFO] An SPF record is published but no MX records are present. This is normal for send-only domains but worth confirming if you expect to receive mail.

A records

[
  {
    "type": "A",
    "value": "185.199.110.153"
  },
  {
    "type": "A",
    "value": "185.199.111.153"
  },
  {
    "type": "A",
    "value": "185.199.108.153"
  },
  {
    "type": "A",
    "value": "185.199.109.153"
  }
]

NS records

[
  {
    "type": "NS",
    "value": "ns-1339.awsdns-39.org"
  },
  {
    "type": "NS",
    "value": "dns1.p05.nsone.net"
  },
  {
    "type": "NS",
    "value": "dns3.p05.nsone.net"
  },
  {
    "type": "NS",
    "value": "ns-393.awsdns-49.com"
  },
  {
    "type": "NS",
    "value": "dns2.p05.nsone.net"
  },
  {
    "type": "NS",
    "value": "ns-692.awsdns-22.net"
  },
  {
    "type": "NS",
    "value": "dns4.p05.nsone.net"
  },
  {
    "type": "NS",
    "value": "ns-1622.awsdns-10.co.uk"
  }
]

TXT records

[
  {
    "type": "TXT",
    "entries": [
      "v=spf1 a -all"
    ]
  }
]

SOA records

[
  {
    "type": "SOA",
    "nsname": "dns1.p05.nsone.net",
    "hostmaster": "hostmaster.nsone.net",
    "serial": 1647625169,
    "refresh": 43200,
    "retry": 7200,
    "expire": 1209600,
    "minttl": 3600
  }
]

CAA records

[
  {
    "type": "CAA",
    "critical": 0,
    "tag": "issuewild",
    "value": "sectigo.com"
  },
  {
    "type": "CAA",
    "critical": 0,
    "tag": "issuewild",
    "value": "digicert.com"
  },
  {
    "type": "CAA",
    "critical": 0,
    "tag": "issue",
    "value": "digicert.com"
  },
  {
    "type": "CAA",
    "critical": 0,
    "tag": "issue",
    "value": "sectigo.com"
  },
  {
    "type": "CAA",
    "critical": 0,
    "tag": "issue",
    "value": "letsencrypt.org"
  },
  {
    "type": "CAA",
    "critical": 0,
    "tag": "issuewild",
    "value": "letsencrypt.org"
  }
]

What does this mean?

These records are pulled live from authoritative DNS at request time and re-validated daily. Use them to debug routing, deliverability, and TLS issues for github.io.

Related tools: DNS Lookup · SPF Checker · DMARC Lookup