domaininfo

This project makes use of the https://team-cymru.com/community-services/ip-asn-mapping/ service.

Use

A command line tool for looking up details about domains and IP addresses.

domaininfo git:main ❯ make build
go build -o ./bin/domaininfo ./cmd/domaininfo
domaininfo git:main ❯ ./bin/domaininfo www.cnn.com
{
  "domain": "www.cnn.com",
  "canonicalNamesTargets": [
    "turner-tls.map.fastly.net."
  ],
  "ipv4AddressInfo": {
    "151.101.1.67": [
      {
        "asn": "54113",
        "addressBlock": "151.101.0.0/22",
        "country": "US",
        "internetRegistry": "arin",
        "date": "2016-02-01"
      }
    ],
    "151.101.129.67": [
      {
        "asn": "54113",
        "addressBlock": "151.101.128.0/22",
        "country": "US",
        "internetRegistry": "arin",
        "date": "2016-02-01"
      }
    ],
    "151.101.193.67": [
      {
        "asn": "54113",
        "addressBlock": "151.101.192.0/22",
        "country": "US",
        "internetRegistry": "arin",
        "date": "2016-02-01"
      }
    ],
    "151.101.65.67": [
      {
        "asn": "54113",
        "addressBlock": "151.101.64.0/22",
        "country": "US",
        "internetRegistry": "arin",
        "date": "2016-02-01"
      }
    ]
  },
  "ipv6AddressInfo": {
    "2a04:4e42:200::323": [
      {
        "asn": "54113",
        "addressBlock": "2a04:4e42::/36",
        "country": "EU",
        "internetRegistry": "ripencc",
        "date": "2013-07-18"
      }
    ],
    "2a04:4e42:400::323": [
      {
        "asn": "54113",
        "addressBlock": "2a04:4e42::/36",
        "country": "EU",
        "internetRegistry": "ripencc",
        "date": "2013-07-18"
      }
    ],
    "2a04:4e42:600::323": [
      {
        "asn": "54113",
        "addressBlock": "2a04:4e42::/36",
        "country": "EU",
        "internetRegistry": "ripencc",
        "date": "2013-07-18"
      }
    ],
    "2a04:4e42::323": [
      {
        "asn": "54113",
        "addressBlock": "2a04:4e42::/36",
        "country": "EU",
        "internetRegistry": "ripencc",
        "date": "2013-07-18"
      }
    ]
  },
  "asnDescriptions": [
    {
      "asn": "54113",
      "country": "US",
      "internetRegistry": "arin",
      "date": "2011-10-04",
      "org": "FASTLY, US"
    }
  ],
  "caaInfos": [
    {
      "domain": "www.cnn.com",
      "cas": []
    },
    {
      "domain": "turner-tls.map.fastly.net.",
      "cas": []
    },
    {
      "domain": "cnn.com",
      "cas": []
    }
  ]
}

The command line output provides:

• The canonical name which is the final name after following zero or more CNAME records
• IPv4 and IPv6 addresses from DNS lookup
• Autonomous system number (ASN) info for an IP address
• A description of all autonomous system numbers found for the IP addresses
• CAA record lookup according to https://docs.digicert.com/manage-certificates/dns-caa-resource-record-check/

Further Reading

• https://en.wikipedia.org/wiki/Autonomous_system_(Internet)
• https://team-cymru.com/community-services/
• https://github.com/miekg/dns