DNS records for readthedocs.io

Findings

[WARN] This domain accepts mail (MX present) but publishes no SPF record. Receivers will be more likely to mark outbound mail as spam or reject it.

A records

[
  {
    "type": "A",
    "value": "104.16.254.120"
  },
  {
    "type": "A",
    "value": "104.16.253.120"
  }
]

AAAA records

[
  {
    "type": "AAAA",
    "value": "2606:4700::6810:fe78"
  },
  {
    "type": "AAAA",
    "value": "2606:4700::6810:fd78"
  }
]

MX records

[
  {
    "type": "MX",
    "exchange": "aspmx3.googlemail.com",
    "priority": 10
  },
  {
    "type": "MX",
    "exchange": "aspmx.l.google.com",
    "priority": 1
  },
  {
    "type": "MX",
    "exchange": "alt1.aspmx.l.google.com",
    "priority": 5
  },
  {
    "type": "MX",
    "exchange": "alt2.aspmx.l.google.com",
    "priority": 5
  },
  {
    "type": "MX",
    "exchange": "aspmx2.googlemail.com",
    "priority": 10
  }
]

NS records

[
  {
    "type": "NS",
    "value": "tegan.ns.cloudflare.com"
  },
  {
    "type": "NS",
    "value": "ivan.ns.cloudflare.com"
  }
]

SOA records

[
  {
    "type": "SOA",
    "nsname": "ivan.ns.cloudflare.com",
    "hostmaster": "dns.cloudflare.com",
    "serial": 2401493338,
    "refresh": 10000,
    "retry": 2400,
    "expire": 604800,
    "minttl": 1800
  }
]

CAA records

[
  {
    "type": "CAA",
    "critical": 0,
    "tag": "issuewild",
    "value": "digicert.com; cansignhttpexchanges=yes"
  },
  {
    "type": "CAA",
    "critical": 0,
    "tag": "issue",
    "value": "letsencrypt.org"
  },
  {
    "type": "CAA",
    "critical": 0,
    "tag": "issuewild",
    "value": "letsencrypt.org"
  },
  {
    "type": "CAA",
    "critical": 0,
    "tag": "issuewild",
    "value": "amazonaws.com"
  },
  {
    "type": "CAA",
    "critical": 0,
    "tag": "issue",
    "value": "pki.goog; cansignhttpexchanges=yes"
  },
  {
    "type": "CAA",
    "critical": 0,
    "tag": "issuewild",
    "value": "ssl.com"
  },
  {
    "type": "CAA",
    "critical": 0,
    "tag": "issuewild",
    "value": "pki.goog; cansignhttpexchanges=yes"
  },
  {
    "type": "CAA",
    "critical": 0,
    "tag": "issuewild",
    "value": "comodoca.com"
  },
  {
    "type": "CAA",
    "critical": 0,
    "tag": "issue",
    "value": "comodoca.com"
  },
  {
    "type": "CAA",
    "critical": 0,
    "tag": "issue",
    "value": "digicert.com; cansignhttpexchanges=yes"
  },
  {
    "type": "CAA",
    "critical": 0,
    "tag": "issue",
    "value": " amazontrust.com"
  },
  {
    "type": "CAA",
    "critical": 0,
    "tag": "issue",
    "value": "ssl.com"
  }
]

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 readthedocs.io.

Related tools: DNS Lookup · SPF Checker · DMARC Lookup