DNS records for t.co

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": "172.66.0.227"
  }
]

NS records

[
  {
    "type": "NS",
    "value": "c.u06.twtrdns.net"
  },
  {
    "type": "NS",
    "value": "b.u06.twtrdns.net"
  },
  {
    "type": "NS",
    "value": "a.u06.twtrdns.net"
  },
  {
    "type": "NS",
    "value": "d.r06.twtrdns.net"
  },
  {
    "type": "NS",
    "value": "a.r06.twtrdns.net"
  },
  {
    "type": "NS",
    "value": "b.r06.twtrdns.net"
  },
  {
    "type": "NS",
    "value": "d.u06.twtrdns.net"
  },
  {
    "type": "NS",
    "value": "c.r06.twtrdns.net"
  }
]

TXT records

[
  {
    "type": "TXT",
    "entries": [
      "1z8q6j6wymwb6bh0t3q28tp7vsbgnh6d"
    ]
  },
  {
    "type": "TXT",
    "entries": [
      "v=spf1 -all"
    ]
  },
  {
    "type": "TXT",
    "entries": [
      "1nfb08f5jkpy0flhn6lwml2vk7x34hrd"
    ]
  },
  {
    "type": "TXT",
    "entries": [
      "48qgbs8f2v055y997kpf4cx2302fzfs2"
    ]
  }
]

SOA records

[
  {
    "type": "SOA",
    "nsname": "a.u06.twtrdns.net",
    "hostmaster": "noc.twitter.com",
    "serial": 2023121101,
    "refresh": 3600,
    "retry": 600,
    "expire": 604800,
    "minttl": 3600
  }
]

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 t.co.

Related tools: DNS Lookup · SPF Checker · DMARC Lookup