Scroll for more. ARIN offers public access to Internet resource registration data via a number of services. The Whois protocol, originally specified in RFC , is a query and response protocol that is used for querying databases that store registered users or assignees of an Internet resource, such as IP addresses, Autonomous System Numbers ASNs or domain names.
RDAP is a protocol that was developed, with IETF guidance, to offer a standardized way to query and retrieve registration data and to eventually replace traditional Whois. The Whois-RWS web interface is shown in the following graphic. Enter the information you want to search Whois for into the search box labeled Search Site or Whois. ARIN sends your query to search. If you enter a search term that has a specific format, such as an IP address for example, or an ASN for example, AS , the search engine automatically performs a Whois query and brings you the results.
If the search engine thinks you are searching for information about subject areas on the web site for example, policy, services, or ARIN functions , it returns results from www. You can search for a network using its IPv4 or IPv6 address. The search engine auto-detects that you are searching for an IP address and the network and related entities information for that IP address is returned. Due to the format of the search term, the search engine auto-detects that you are searching for a CIDR range and the network and related entities information for that CIDR range is returned.
You can search for registration information pertaining to an ASN also called an autnum in routing templates. If the number in your query is part of a block, information for that single ASN in the range is returned.
Different registries may have different formats for ASN data. Entering the AS prefix is optional; for example, entering will automatically detect you are searching for an ASN matching this number and the information for the ASN is returned. An entity represents information in a registry about organizations, corporations, governments, non-profits, clubs, individual persons, and informal groups of people.
Handles typically have the following formats:. In this example, the search engine auto-detects that you are searching for a POC handle and returns information about the POC.
Choosing the Entity search filter searches Whois for only the entity that matches the search term you entered. Broadcast Services, Inc. Forward domain names are used when translating IP addresses into hostnames e. Some registrars will not provide information for all fields in the result; for example, if the registrar does not collect that particular data, or if privacy laws prevent the registrar from sharing that data. You might want to look up when a domain expires, what nameservers are handling the DNS hosting, or you might want to find who the hosting service is so you can lodge a complaint.
You may even like a domain name enough to contact the owner about purchasing the domain, though domain owners often charge a premium. If you change web or email hosting, you will want to query the Whois to find the name servers that will tell you where the domain is hosted. When you migrate your website and email to a new hosting service, you will need to update the name servers to point at your new hosting service then verify that the name server changes took effect.
These are tasks for which you will find the Whois utility an essential part of your toolkit. Windows users just need to add the specific tool to do it; macOS and Linux have a Whois utility built into the system and ready to use. Utilities like Whois are installed by default. If the macOS or Linux whois data scrolls by too quickly you can pipe the output to paging utility to scroll through the data at your own pace:. As many consumers use search engines to find information on the Internet, they may not be aware of the term "WHOIS" to use in a search engine.
The raw WHOIS data is organized by contact data domain name registrant contact, administrative contact, technical contact, and abuse contact and also contains information such as the registrar, status of the domain name, and important dates. We have updated our privacy policies and certain website terms of service to provide greater transparency, promote simplification, and align with recent changes in privacy laws applicable to us.
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