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WHOIS Lookup

Look up the registration record for a domain or an IP block, RDAP first, with port 43 WHOIS as the fallback.

RDAP first. WHOIS on port 43 when a registry publishes no RDAP service.

RDAP first. Port 43 WHOIS only when RDAP has nothing to give.
AS recordAS3356

Structured RDAP from rdap.arin.net.

Allocation

Normalised from RDAP
AS number
AS3356
Netname
LEVEL3
Holder
Level 3 Parent, LLC
Country
Not published
Registry
ARIN — American Registry for Internet Numbers
Block
Not published
Registered
2000-03-10T00:00:00-05:00
Last changed
2018-02-20T12:38:56-05:00
Abuse contact
abuse@level3.com
Status
active
Registry server
rdap.arin.net
Raw RDAP JSON
{
  "endAutnum": 3356,
  "entities": [
    {
      "entities": [
        {
          "events": [
            {
              "eventAction": "last changed",
              "eventDate": "2026-01-29T18:50:52-05:00"
            },
            {
              "eventAction": "registration",
              "eventDate": "2021-01-14T16:49:19-05:00"
            }
          ],
          "handle": "LAC56-ARIN",
          "links": [
            {
              "href": "https://rdap.arin.net/registry/entity/LAC56-ARIN",
              "rel": "self",
              "type": "application/rdap+json",
              "value": "https://rdap.arin.net/registry/autnum/3356"
            },
            {
              "href": "https://whois.arin.net/rest/poc/LAC56-ARIN",
              "rel": "alternate",
              "type": "application/xml",
              "value": "https://rdap.arin.net/registry/autnum/3356"
            }
          ],
          "objectClassName": "entity",
          "port43": "whois.arin.net",
          "roles": [
            "abuse"
          ],
          "status": [
            "validated"
          ],
          "vcardArray": [
            "vcard",
            [
              [
                "version",
                {},
                "text",
                "4.0"
              ],
              [
                "adr",
                {
                  "label": "100 CenturyLink Drive\nMonroe\nLA\n71203\nUnited States"
                },
                "text",
                [
                  "",
                  "",
                  "",
                  "",
                  "",
                  "",
                  ""
                ]
              ],
              [
                "fn",
                {},
                "text",
                "L3 Abuse Contact"
              ],
              [
                "org",
                {},
                "text",
                "Level 3 Parent, LLC"
              ],
              [
                "kind",
                {},
                "text",
                "group"
              ],
              [
                "email",
                {},
                "text",
                "abuse@level3.com"
              ],
              [
                "tel",
                {
                  "type": [
                    "work",
                    "voice"
                  ]
                },
                "text",
                "+1-877-453-8353"
              ]
            ]
          ]
        },
        {
          "events": [
            {
              "eventAction": "last changed",
              "eventDate": "2026-01-05T14:26:44-05:00"
            },
            {
              "eventAction": "registration",
              "eventDate": "2003-01-28T16:00:44-05:00"
            }
          ],
          "handle": "APL7-ARIN",
          "links": [
            {
              "href": "https://rdap.arin.net/registry/entity/APL7-ARIN",
              "rel": "self",
              "type": "application/rdap+json",
              "value": "https://rdap.arin.net/registry/autnum/3356"
            },
            {
              "href": "https://whois.arin.net/rest/poc/APL7-ARIN",
              "rel": "alternate",
              "type": "application/xml",
              "value": "https://rdap.arin.net/registry/autnum/3356"
            }
          ],
          "objectClassName": "entity",
          "port43": "whois.arin.net",
          "remarks": [
            {
              "description": [
                "ADDRESSES WITHIN THIS BLOCK ARE NON-PORTABLE ANY ISP ANNOUNCING OR TRANSITING PORTIONS WITHIN OUR RANGES SHOULD NOT RELY ON PRESENTED LOA'S UNLESS THOSE RANGES ARE ALSO ANNOUNCED TO A LUMEN ASN. ",
                "",
                "Our looking glass is located at: https://lookingglass.centurylink.com/",
                "",
                "For subpoena or court order please fax 844.254.5800 or refer to our Trust & Safety page:",
                "https://www.lumen.com/en-us/about/legal/trust-center/trust-and-safety.html",
                "",
                "For abuse issues, please email abuse@aup.lumen.com",
                "All abuse reports MUST include: ",
                "* src IP ",
                "* dest IP (your IP) ",
                "* dest port ",
                "* Accurate date/timestamp and timezone of activity ",
                "* Intensity/frequency (short log extracts) ",
                "* Your contact details (phone and email) ",
                "Without these we will be unable to identify the correct owner of the IP address at that point in time. "
              ],
              "title": "Registration Comments"
            }
          ],
          "roles": [
            "administrative",
            "technical"
          ],
          "status": [
            "validated"
          ],
          "vcardArray": [
            "vcard",
            [
              [
                "version",
                {},
                "text",
                "4.0"
              ],
              [
                "adr",
                {
                  "label": "1025 Eldorado Blvd.\nBroomfield\nCO\n80021\nUnited States"
                },
                "text",
                [
                  "",
                  "",
                  "",
                  "",
                  "",
                  "",
                  ""
                ]
              ],
              [
                "fn",
                {},
                "text",
                "ADMIN POC LVLT"
              ],
              [
                "org",
                {},
                "text",
                "Level 3 Communications - IP Addressing"
              ],
              [
                "kind",
                {},
                "text",
                "group"
              ],
              [
                "email",
                {},
                "text",
                "ipadmin@lumen.com"
              ],
              [
                "email",
                {},
                "text",
                "ipadmin@centurylink.com"
              ],
              [
                "tel",
                {
                  "type": [
                    "work",
                    "voice"
                  ]
                },
                "text",
                "+1-877-453-8353"
              ]
            ]
          ]
        },
        {
          "events": [
            {
              "eventAction": "last changed",
              "eventDate": "2026-06-22T11:07:37-04:00"
            },
            {
              "eventAction": "registration",
              "eventDate": "2024-06-17T21:51:42-04:00"
            }
          ],
          "handle": "RPKIR-ARIN",
          "links": [
            {
              "href": "https://rdap.arin.net/registry/entity/RPKIR-ARIN",
              "rel": "self",
              "type": "application/rdap+json",
              "value": "https://rdap.arin.net/registry/autnum/3356"
            },
            {
              "href": "https://whois.arin.net/rest/poc/RPKIR-ARIN",
              "rel": "alternate",
              "type": "application/xml",
              "value": "https://rdap.arin.net/registry/autnum/3356"
            }
          ],
          "objectClassName": "entity",
          "port43": "whois.arin.net",
          "remarks": [
            {
              "description": [
                "For creating ROKI ROA's"
              ],
              "title": "Registration Comments"
            }
          ],
          "roles": [
            "routing"
          ],
          "status": [
            "validated"
          ],
          "vcardArray": [
            "vcard",
            [
              [
                "version",
                {},
                "text",
                "4.0"
              ],
              [
                "adr",
                {
                  "label": "100 CENTURYLINK DR\n\nMonroe\nLA\n71201\nUnited States"
                },
                "text",
                [
                  "",
                  "",
                  "",
                  "",
                  "",
                  "",
                  ""
                ]
              ],
              [
                "fn",
                {},
                "text",
                "RPKI-ROA"
              ],
              [
                "org",
                {},
                "text",
                "Lumen"
              ],
              [
                "kind",
                {},
                "text",
                "group"
              ],
              [
                "email",
                {},
                "text",
                "rpki-roa@lumen.com"
              ],
              [
                "tel",
                {
                  "type": [
                    "work",
                    "voice"
                  ]
                },
                "text",
                "+1-877-886-6515"
              ]
            ]
          ]
        }
      ],
      "events": [
        {
          "eventAction": "last changed",
          "eventDate": "2026-04-22T11:04:05-04:00"
        },
        {
          "eventAction": "registration",
          "eventDate": "2018-02-06T12:45:14-05:00"
        }
      ],
      "handle": "LPL-141",
      "links": [
        {
          "href": "https://rdap.arin.net/registry/entity/LPL-141",
          "rel": "self",
          "type": "application/rdap+json",
          "value": "https://rdap.arin.net/registry/autnum/3356"
        },
        {
          "href": "https://whois.arin.net/rest/org/LPL-141",
          "rel": "alternate",
          "type": "application/xml",
          "value": "https://rdap.arin.net/registry/autnum/3356"
        }
      ],
      "objectClassName": "entity",
      "port43": "whois.arin.net",
      "remarks": [
        {
          "description": [
            "USAGE OF IP SPACE MUST COMPLY WITH OUR ACCEPTABLE USE POLICY:",
            "https://www.lumen.com/en-us/about/legal/acceptable-use-policy.html",
            "",
            "ADDRESSES COVERED BY THIS ORG-ID ARE NON-PORTABLE ANY ISP ANNOUNCING OR TRANSITING PORTIONS WITHIN OUR RANGES SHOULD NOT RELY ON PRESENTED LOA'S OR OLD WHOIS UNLESS THOSE RANGES ARE ALSO ACTIVELY DIRECTLY ANNOUNCED TO A LUMEN ASN. WITH ALL LOA'S THESE CONDITIONS APPLY:",
            "",
            "1. You are permitted to route the Lumen IP prefixes listed via Public BGP to your alternate ISP from the designated ASN. Any other ASN originating the prefix listed is forbidden.",
            "2. The Lumen IP prefixes listed can be routed via Public BGP to your alternate ISP as long as you remain an active customer with Lumen and continue to route the prefixes over at least one Lumen Internet circuit without significant traffic engineering.",
            "3. Should your Internet services with Lumen be discontinued, Lumen reserves the right to have your alternate ISP terminate the routing of the Lumen IP prefixes without advanced notification, should you fail to do so.",
            "4. All IP Addresses assigned or allocated by Lumen to an end-user (customer or ISP) shall be considered non-portable and will be reclaimed by Lumen upon service termination.",
            "5. Lumen reserves the right to conduct audits to ensure the LOA conditions are being met.",
            "6. Usage of IP space must comply with our AUP https://www.lumen.com/en-us/about/legal/acceptable-use-policy.html",
            "",
            "Our looking glass is located at: https://lookingglass.centurylink.com/",
            "",
            "For subpoena or court order please fax 844.254.5800 or refer to our Trust & Safety page:",
            "https://www.lumen.com/en-us/about/legal/trust-center/trust-and-safety.html",
            "",
            "For abuse issues, please email abuse@aup.lumen.com",
            "All abuse reports MUST include:",
            "* src IP",
            "* dest IP (your IP)",
            "* dest port",
            "* Accurate date/timestamp and timezone of activity",
            "* Intensity/frequency (short log extracts)",
            "* Your contact details (phone and email)",
            "Without these we will be unable to identify the correct owner of the IP address at that point in time."
          ],
          "title": "Registration Comments"
        }
      ],
      "roles": [
        "registrant"
      ],
      "vcardArray": [
        "vcard",
        [
          [
            "version",
            {},
            "text",
            "4.0"
          ],
          [
            "fn",
            {},
            "text",
            "Level 3 Parent, LLC"
          ],
          [
            "adr",
            {
              "label": "100 CenturyLink Drive\nMonroe\nLA\n71203\nUnited States"
            },
            "text",
            [
              "",
              "",
              "",
              "",
              "",
              "",
              ""
            ]
          ],
          [
            "kind",
            {},
            "text",
            "org"
          ]
        ]
      ]
    }
  ],
  "events": [
    {
      "eventAction": "last changed",
      "eventDate": "2018-02-20T12:38:56-05:00"
    },
    {
      "eventAction": "registration",
      "eventDate": "2000-03-10T00:00:00-05:00"
    }
  ],
  "handle": "AS3356",
  "links": [
    {
      "href": "https://rdap.arin.net/registry/autnum/3356",
      "rel": "self",
      "type": "application/rdap+json",
      "value": "https://rdap.arin.net/registry/autnum/3356"
    },
    {
      "href": "https://whois.arin.net/rest/asn/AS3356",
      "rel": "alternate",
      "type": "application/xml",
      "value": "https://rdap.arin.net/registry/autnum/3356"
    }
  ],
  "name": "LEVEL3",
  "notices": [
    {
      "description": [
        "By using the ARIN RDAP/Whois service, you are agreeing to the RDAP/Whois Terms of Use"
      ],
      "links": [
        {
          "href": "https://www.arin.net/resources/registry/whois/tou/",
          "rel": "terms-of-service",
          "type": "text/html",
          "value": "https://rdap.arin.net/registry/autnum/3356"
        }
      ],
      "title": "Terms of Service"
    },
    {
      "description": [
        "If you see inaccuracies in the results, please visit: "
      ],
      "links": [
        {
          "href": "https://www.arin.net/resources/registry/whois/inaccuracy_reporting/",
          "rel": "inaccuracy-report",
          "type": "text/html",
          "value": "https://rdap.arin.net/registry/autnum/3356"
        }
      ],
      "title": "Whois Inaccuracy Reporting"
    },
    {
      "description": [
        "Copyright 1997-2026, American Registry for Internet Numbers, Ltd."
      ],
      "title": "Copyright Notice"
    }
  ],
  "objectClassName": "autnum",
  "port43": "whois.arin.net",
  "rdapConformance": [
    "nro_rdap_profile_0",
    "rdap_level_0",
    "nro_rdap_profile_asn_flat_0"
  ],
  "startAutnum": 3356,
  "status": [
    "active"
  ]
}

Cached for six hours. The same record as JSON: /api/v1/rdap. Add &raw=1 for the unmodified registry document.

RDAP first, WHOIS as a fallback

RDAP gives us typed fields, so the normalised view on this page is a mapping rather than a guess. Classic WHOIS output has no schema at all; each registry invented its own labels, and parsing it reliably is a losing game. When a registry publishes no RDAP endpoint, usually an older country-code registry, we fall back to a port 43 query and show the raw text with only light normalisation. The result labels which path was used.

Reading the raw output

The raw response stays collapsed under the normalised view. Open it when a field looks wrong, when the registry publishes something we did not map, or when you need the exact text for a dispute or a transfer request. Registry text is authoritative; our normalisation is a convenience.

Caching

Results cache for six hours. WHOIS and RDAP data changes on the scale of days, registries rate-limit aggressively, and hammering them for a value that did not move helps nobody. If you need a fresh read after a change you just made, wait out the cache rather than retrying in a loop.

About this tool

Enter a domain or an address. We query RDAP first, the structured JSON successor to WHOIS, and fall back to port 43 WHOIS where a registry runs none. A domain returns the registrar, creation and expiry dates, nameservers, and EPP status codes, and an address returns the RIR, netname, organisation, country, and abuse contact. Personal details are usually redacted under privacy law, and results cache for six hours.

How to read the result

Registrar
The accredited company through which the domain was registered, which is where it was bought rather than who owns it. A transfer changes this field while the registrant stays the same.
Creation, updated, and expiry dates
Registry timestamps in UTC for when the domain was created, last changed, and paid through. The expiry date is the paid-through date, not the deletion date, and after it a domain usually passes through a renewal grace period, then redemption, then pending-delete, roughly 75 days in total.
Nameservers
The nameservers recorded at the registry as the delegation for this domain. They can differ from the NS records the zone itself serves, when a zone was changed without updating the delegation, which is a lame delegation.
EPP status codes
Registry and registrar locks that say what can be done with the domain right now. clientTransferProhibited is normal and prevents unauthorised transfers, serverHold means the domain is not published in the zone at all, and pendingDelete and redemptionPeriod mean an expired domain is moving toward deletion.
Registrant details or a redaction notice
For most generic and European domains the registrant name, address, and email are withheld under GDPR and ICANN Temporary Specification policy, leaving a registrar-operated forwarding address. Some country registries publish more, and business registrations often do.
For IP addresses, RIR, netname, org, and abuse contact
The Regional Internet Registry that allocated the block, the registered netname, the holding organisation, and the abuse mailbox to complain to. For a hosting provider the organisation is the provider rather than their customer, and that mailbox is where a complaint about the customer goes.

Questions people ask

Why is the WHOIS record for a domain redacted?
The GDPR took effect in 2018 and ICANN issued a Temporary Specification requiring registries and registrars to withhold personal data from public output. Most contact fields for private registrants are now replaced with a redaction notice and a forwarding address. Legitimate access requests go through the registrar or the RDAP tiered-access process.
What is the difference between WHOIS and RDAP?
WHOIS is a plain-text protocol from 1982 with no consistent format, no authentication, and no internationalisation. RDAP returns structured JSON over HTTPS, supports differentiated access, and is standardised in RFC 7480 through 7484. ICANN has required RDAP for gTLDs since 2019, and it is the source we prefer.
Can I find who owns an IP address?
You can find the organisation the block is registered to, which for a datacenter address is the hosting provider rather than the customer running the machine. Smaller allocations sometimes name the end customer in the netname. There is no public record linking a residential address to a person.
The domain looks unregistered but I cannot buy it. Why?
Check the status codes. redemptionPeriod and pendingDelete mean a previous registration expired and is still working through the deletion sequence, which takes about 75 days total. Some registries also reserve names or hold them at premium pricing without showing a registration.
Is a WHOIS lookup visible to the domain owner?
Not through the query itself. RDAP and WHOIS queries go to the registry or registrar, not to the domain holder. Registries log queries and rate-limit them, so heavy automated querying gets throttled or blocked.

Related

Last reviewed 2026-09-05.